Tag Archives: Pi Zero

e-paper pocket money tracker using Monzo pots

Post Syndicated from Alex Bate original https://www.raspberrypi.org/blog/monzo-money-tracker/

Jason Barnett used the pots feature of the Monzo banking API to create a simple e-paper display so that his kids can keep track of their pocket money.

Monzo ePaper Pot Jason Barnett Raspberry Pi

Monzo

For those outside the UK: Monzo is a smartphone-based bank that allows costumers to manage their money and payment cards via an app, removing the bank clerk middleman.

In the Monzo banking app, users can set up pots, which allow them to organise their money into various, you guessed it, pots. You want to put aside holiday funds, budget your food shopping, or, like Jason, manage your kids’ pocket money? Using pots is an easy way to do it.

Jason’s Monzo Pot ePaper tracker

After failed attempts at keeping track of his sons’ pocket money via a scrap of paper stuck to the fridge, Jason decided to try a new approach.

He started his build by installing Stretch Lite to the SD card of his Raspberry Pi Zero W. “The Pi will be running headless (without screen, mouse or keyboard)”, he explains on his blog, “so there is no need for a full-fat Raspbian image.” While Stretch Lite was downloading, he set up the Waveshare ePaper HAT on his Zero W. He notes that Pimoroni’s “Inky pHAT would be easiest,” but his tutorial is specific to the Waveshare device.

Monzo ePaper Pot Jason Barnett Raspberry Pi

Before ejecting the SD card, Jason updated the boot partition to allow him to access the Pi via SSH. He talks makers through that process here.

Among the libraries he installed for the project is pyMonzo, a Python wrapper for the Monzo API created by Paweł Adamczak. Monzo is still in its infancy, and the API is partly under construction. Until it’s completed, Paweł’s wrapper offers a more stable way to use it.

After installing the software, it was time to set up the e-paper screen for the tracker. Jason adjusted the code for the API so that the screen reloads information every 15 minutes, displaying the up-to-date amount of pocket money in both kids’ pots.

Here is how Jason describes going to the supermarket with his sons, now that he has completed the tracker:

“Daddy, I want (insert first thing picked up here), I’ve always wanted one of these my whole life!” […] Even though you have never seen that (insert thing here) before, I can quickly open my Monzo app, flick to Account, and say “You have £3.50 in your money box”. If my boy wants it, a 2-second withdrawal is made whilst queueing, and done — he walks away with a new (again, insert whatever he wanted his whole life here) and is happy!

Jason’s blog offers a full breakdown of his project, including all necessary code and the specs for the physical build. Be sure to head over and check it out.

Have you used an API in your projects? What would you build with one?

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Zero WH: pre-soldered headers and what to do with them

Post Syndicated from Alex Bate original https://www.raspberrypi.org/blog/zero-wh/

If you head over to the website of your favourite Raspberry Pi Approved Reseller today, you may find the new Zero WH available to purchase. But what it is? Why is it different, and what can you do with it?

Raspberry Pi Zero WH

“If you like pre-soldered headers, and getting caught in the rain…”

Raspberry Pi Zero WH

Imagine a Raspberry Pi Zero W. Now add a professionally soldered header. Boom, that’s the Raspberry Pi Zero WH! It’s your same great-tasting Pi, with a brand-new…crust? It’s perfect for everyone who doesn’t own a soldering iron or who wants the soldering legwork done for them.

What you can do with the Zero WH

What can’t you do? Am I right?! The small size of the Zero W makes it perfect for projects with minimal wiggle-room. In such projects, some people have no need for GPIO pins — they simply solder directly to the board. However, there are many instances where you do want a header on your Zero W, for example in order to easily take advantage of the GPIO expander tool for Debian Stretch on a PC or Mac.

GPIO expander in clubs and classrooms

As Ben Nuttall explains in his blog post on the topic:

[The GPIO expander tool] is a real game-changer for Raspberry Jams, Code Clubs, CoderDojos, and schools. You can live boot the Raspberry Pi Desktop OS from a USB stick, use Linux PCs, or even install [the Pi OS] on old computers. Then you have really simple access to physical computing without full Raspberry Pi setups, and with no SD cards to configure.

Using the GPIO expander with the Raspberry Pi Zero WH decreases the setup cost for anyone interested in trying out physical computing in the classroom or at home. (And once you’ve stuck your toes in, you’ll obviously fall in love and will soon find yourself with multiple Raspberry Pi models, HATs aplenty, and an area in your home dedicated to your new adventure in Raspberry Pi. Don’t say I didn’t warn you.)

Other uses for a Zero W with a header

The GPIO expander setup is just one of a multitude of uses for a Raspberry Pi Zero W with a header. You may want the header for prototyping before you commit to soldering wires directly to a board. Or you may have a temporary build in mind for your Zero W, in which case you won’t want to commit to soldering wires to the board at all.

Raspberry Pi Zero WH

Your use case may be something else entirely — tell us in the comments below how you’d utilise a pre-soldered Raspberry Pi Zero WH in your project. The best project idea will receive ten imaginary house points of absolutely no practical use, but immense emotional value. Decide amongst yourselves who you believe should win them — I’m going to go waste a few more hours playing SLUG!

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Turn your smartphone into a universal remote

Post Syndicated from Alex Bate original https://www.raspberrypi.org/blog/zero-universal-remote/

Honolulu-based software developer bbtinkerer was tired of never being able to find the TV remote. So he made his own using a Raspberry Pi Zero, and connected it to a web app accessible on his smartphone.

bbtinkerer universal remote Raspberry Pi zero

Finding a remote alternative

“I needed one because the remote in my house tends to go missing a lot,” explains Bernard aka bbtinkerer on the Instructables page for his Raspberry Pi Zero Universal Remote.”If I want the controller, I have to hunt down three people and hope one of them remembers that they took it.”

bbtinkerer universal remote Raspberry Pi zero

For the build, Bernard used a Raspberry Pi Zero, an IR LED and corresponding receiver, Raspbian Lite, and a neat little 3D-printed housing.

bbtinkerer universal remote Raspberry Pi zero
bbtinkerer universal remote Raspberry Pi zero
bbtinkerer universal remote Raspberry Pi zero

First, he soldered a circuit for the LED and resistors on a small piece of perf board. Then he assembled the hardware components. Finally, all he needed to do was to write the code to control his devices (including a tower fan), and to set up the app.

bbtinkerer universal remote Raspberry Pi zero

Bernard employed the Linux Infrared Remote Control (LIRC) package to control the television with the Raspberry Pi Zero, accessing the Zero via SSH. He gives a complete rundown of the installation process on Instructables.

bbtinkerer universal remote Raspberry Pi zero

Setting up a remote’s buttons with LIRC is a simple case of pressing them and naming their functions one by one. You’ll need the remote to set up the system, but after that, feel free to lock it in a drawer and use your smartphone instead.



Finally, Bernard created the web interface using Node.js, and again, because he’s lovely, he published the code for anyone wanting to build their own. Thanks, Bernard!

Life hacks

If you’ve used a Raspberry Pi to build a time-saving life hack like Bernard’s, be sure to share it with us. Other favourites of ours include fridge cameras, phone app doorbell notifications, and Alan’s ocarina home automation system. I’m not sure if this last one can truly be considered a time-saving life hack. It’s still cool though!

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Why Raspberry Pi isn’t vulnerable to Spectre or Meltdown

Post Syndicated from Eben Upton original https://www.raspberrypi.org/blog/why-raspberry-pi-isnt-vulnerable-to-spectre-or-meltdown/

Over the last couple of days, there has been a lot of discussion about a pair of security vulnerabilities nicknamed Spectre and Meltdown. These affect all modern Intel processors, and (in the case of Spectre) many AMD processors and ARM cores. Spectre allows an attacker to bypass software checks to read data from arbitrary locations in the current address space; Meltdown allows an attacker to read arbitrary data from the operating system kernel’s address space (which should normally be inaccessible to user programs).

Both vulnerabilities exploit performance features (caching and speculative execution) common to many modern processors to leak data via a so-called side-channel attack. Happily, the Raspberry Pi isn’t susceptible to these vulnerabilities, because of the particular ARM cores that we use.

To help us understand why, here’s a little primer on some concepts in modern processor design. We’ll illustrate these concepts using simple programs in Python syntax like this one:

t = a+b
u = c+d
v = e+f
w = v+g
x = h+i
y = j+k

While the processor in your computer doesn’t execute Python directly, the statements here are simple enough that they roughly correspond to a single machine instruction. We’re going to gloss over some details (notably pipelining and register renaming) which are very important to processor designers, but which aren’t necessary to understand how Spectre and Meltdown work.

For a comprehensive description of processor design, and other aspects of modern computer architecture, you can’t do better than Hennessy and Patterson’s classic Computer Architecture: A Quantitative Approach.

What is a scalar processor?

The simplest sort of modern processor executes one instruction per cycle; we call this a scalar processor. Our example above will execute in six cycles on a scalar processor.

Examples of scalar processors include the Intel 486 and the ARM1176 core used in Raspberry Pi 1 and Raspberry Pi Zero.

What is a superscalar processor?

The obvious way to make a scalar processor (or indeed any processor) run faster is to increase its clock speed. However, we soon reach limits of how fast the logic gates inside the processor can be made to run; processor designers therefore quickly began to look for ways to do several things at once.

An in-order superscalar processor examines the incoming stream of instructions and tries execute more than one at once, in one of several “pipes”, subject to dependencies between the instructions. Dependencies are important: you might think that a two-way superscalar processor could just pair up (or dual-issue) the six instructions in our example like this:

t, u = a+b, c+d
v, w = e+f, v+g
x, y = h+i, j+k

But this doesn’t make sense: we have to compute v before we can compute w, so the third and fourth instructions can’t be executed at the same time. Our two-way superscalar processor won’t be able to find anything to pair with the third instruction, so our example will execute in four cycles:

t, u = a+b, c+d
v    = e+f                   # second pipe does nothing here
w, x = v+g, h+i
y    = j+k

Examples of superscalar processors include the Intel Pentium, and the ARM Cortex-A7 and Cortex-A53 cores used in Raspberry Pi 2 and Raspberry Pi 3 respectively. Raspberry Pi 3 has only a 33% higher clock speed than Raspberry Pi 2, but has roughly double the performance: the extra performance is partly a result of Cortex-A53’s ability to dual-issue a broader range of instructions than Cortex-A7.

What is an out-of-order processor?

Going back to our example, we can see that, although we have a dependency between v and w, we have other independent instructions later in the program that we could potentially have used to fill the empty pipe during the second cycle. An out-of-order superscalar processor has the ability to shuffle the order of incoming instructions (again subject to dependencies) in order to keep its pipelines busy.

An out-of-order processor might effectively swap the definitions of w and x in our example like this:

t = a+b
u = c+d
v = e+f
x = h+i
w = v+g
y = j+k

allowing it to execute in three cycles:

t, u = a+b, c+d
v, x = e+f, h+i
w, y = v+g, j+k

Examples of out-of-order processors include the Intel Pentium 2 (and most subsequent Intel and AMD x86 processors), and many recent ARM cores, including Cortex-A9, -A15, -A17, and -A57.

What is speculation?

Reordering sequential instructions is a powerful way to recover more instruction-level parallelism, but as processors become wider (able to triple- or quadruple-issue instructions) it becomes harder to keep all those pipes busy. Modern processors have therefore grown the ability to speculate. Speculative execution lets us issue instructions which might turn out not to be required (because they are branched over): this keeps a pipe busy, and if it turns out that the instruction isn’t executed, we can just throw the result away.

To demonstrate the benefits of speculation, let’s look at another example:

t = a+b
u = t+c
v = u+d
if v:
   w = e+f
   x = w+g
   y = x+h

Now we have dependencies from t to u to v, and from w to x to y, so a two-way out-of-order processor without speculation won’t ever be able to fill its second pipe. It spends three cycles computing t, u, and v, after which it knows whether the body of the if statement will execute, in which case it then spends three cycles computing w, x, and y. Assuming the if (a branch instruction) takes one cycle, our example takes either four cycles (if v turns out to be zero) or seven cycles (if v is non-zero).

Speculation effectively shuffles the program like this:

t = a+b
u = t+c
v = u+d
w_ = e+f
x_ = w_+g
y_ = x_+h
if v:
   w, x, y = w_, x_, y_

so we now have additional instruction level parallelism to keep our pipes busy:

t, w_ = a+b, e+f
u, x_ = t+c, w_+g
v, y_ = u+d, x_+h
if v:
   w, x, y = w_, x_, y_

Cycle counting becomes less well defined in speculative out-of-order processors, but the branch and conditional update of w, x, and y are (approximately) free, so our example executes in (approximately) three cycles.

What is a cache?

In the good old days*, the speed of processors was well matched with the speed of memory access. My BBC Micro, with its 2MHz 6502, could execute an instruction roughly every 2µs (microseconds), and had a memory cycle time of 0.25µs. Over the ensuing 35 years, processors have become very much faster, but memory only modestly so: a single Cortex-A53 in a Raspberry Pi 3 can execute an instruction roughly every 0.5ns (nanoseconds), but can take up to 100ns to access main memory.

At first glance, this sounds like a disaster: every time we access memory, we’ll end up waiting for 100ns to get the result back. In this case, this example:

a = mem[0]
b = mem[1]

would take 200ns.

In practice, programs tend to access memory in relatively predictable ways, exhibiting both temporal locality (if I access a location, I’m likely to access it again soon) and spatial locality (if I access a location, I’m likely to access a nearby location soon). Caching takes advantage of these properties to reduce the average cost of access to memory.

A cache is a small on-chip memory, close to the processor, which stores copies of the contents of recently used locations (and their neighbours), so that they are quickly available on subsequent accesses. With caching, the example above will execute in a little over 100ns:

a = mem[0]    # 100ns delay, copies mem[0:15] into cache
b = mem[1]    # mem[1] is in the cache

From the point of view of Spectre and Meltdown, the important point is that if you can time how long a memory access takes, you can determine whether the address you accessed was in the cache (short time) or not (long time).

What is a side channel?

From Wikipedia:

“… a side-channel attack is any attack based on information gained from the physical implementation of a cryptosystem, rather than brute force or theoretical weaknesses in the algorithms (compare cryptanalysis). For example, timing information, power consumption, electromagnetic leaks or even sound can provide an extra source of information, which can be exploited to break the system.”

Spectre and Meltdown are side-channel attacks which deduce the contents of a memory location which should not normally be accessible by using timing to observe whether another location is present in the cache.

Putting it all together

Now let’s look at how speculation and caching combine to permit the Meltdown attack. Consider the following example, which is a user program that sometimes reads from an illegal (kernel) address:

t = a+b
u = t+c
v = u+d
if v:
   w = kern_mem[address]   # if we get here crash
   x = w&0x100
   y = user_mem[x]

Now our out-of-order two-way superscalar processor shuffles the program like this:

t, w_ = a+b, kern_mem[address]
u, x_ = t+c, w_&0x100
v, y_ = u+d, user_mem[x_]

if v:
   # crash
   w, x, y = w_, x_, y_      # we never get here

Even though the processor always speculatively reads from the kernel address, it must defer the resulting fault until it knows that v was non-zero. On the face of it, this feels safe because either:

  • v is zero, so the result of the illegal read isn’t committed to w
  • v is non-zero, so the program crashes before the read is committed to w

However, suppose we flush our cache before executing the code, and arrange a, b, c, and d so that v is zero. Now, the speculative load in the third cycle:

v, y_ = u+d, user_mem[x_]

will read from either address 0x000 or address 0x100 depending on the eighth bit of the result of the illegal read. Because v is zero, the results of the speculative instructions will be discarded, and execution will continue. If we time a subsequent access to one of those addresses, we can determine which address is in the cache. Congratulations: you’ve just read a single bit from the kernel’s address space!

The real Meltdown exploit is more complex than this, but the principle is the same. Spectre uses a similar approach to subvert software array bounds checks.

Conclusion

Modern processors go to great lengths to preserve the abstraction that they are in-order scalar machines that access memory directly, while in fact using a host of techniques including caching, instruction reordering, and speculation to deliver much higher performance than a simple processor could hope to achieve. Meltdown and Spectre are examples of what happens when we reason about security in the context of that abstraction, and then encounter minor discrepancies between the abstraction and reality.

The lack of speculation in the ARM1176, Cortex-A7, and Cortex-A53 cores used in Raspberry Pi render us immune to attacks of the sort.

* days may not be that old, or that good

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Thank you for my new Raspberry Pi, Santa! What next?

Post Syndicated from Alex Bate original https://www.raspberrypi.org/blog/thank-you-for-my-new-raspberry-pi-santa-what-next/

Note: the Pi Towers team have peeled away from their desks to spend time with their families over the festive season, and this blog will be quiet for a while as a result. We’ll be back in the New Year with a bushel of amazing projects, awesome resources, and much merriment and fun times. Happy holidays to all!

Now back to the matter at hand. Your brand new Christmas Raspberry Pi.

Your new Raspberry Pi

Did you wake up this morning to find a new Raspberry Pi under the tree? Congratulations, and welcome to the Raspberry Pi community! You’re one of us now, and we’re happy to have you on board.

But what if you’ve never seen a Raspberry Pi before? What are you supposed to do with it? What’s all the fuss about, and why does your new computer look so naked?

Setting up your Raspberry Pi

Are you comfy? Good. Then let us begin.

Download our free operating system

First of all, you need to make sure you have an operating system on your micro SD card: we suggest Raspbian, the Raspberry Pi Foundation’s official supported operating system. If your Pi is part of a starter kit, you might find that it comes with a micro SD card that already has Raspbian preinstalled. If not, you can download Raspbian for free from our website.

An easy way to get Raspbian onto your SD card is to use a free tool called Etcher. Watch The MagPi’s Lucy Hattersley show you what you need to do. You can also use NOOBS to install Raspbian on your SD card, and our Getting Started guide explains how to do that.

Plug it in and turn it on

Your new Raspberry Pi 3 comes with four USB ports and an HDMI port. These allow you to plug in a keyboard, a mouse, and a television or monitor. If you have a Raspberry Pi Zero, you may need adapters to connect your devices to its micro USB and micro HDMI ports. Both the Raspberry Pi 3 and the Raspberry Pi Zero W have onboard wireless LAN, so you can connect to your home network, and you can also plug an Ethernet cable into the Pi 3.

Make sure to plug the power cable in last. There’s no ‘on’ switch, so your Pi will turn on as soon as you connect the power. Raspberry Pi uses a micro USB power supply, so you can use a phone charger if you didn’t receive one as part of a kit.

Learn with our free projects

If you’ve never used a Raspberry Pi before, or you’re new to the world of coding, the best place to start is our projects site. It’s packed with free projects that will guide you through the basics of coding and digital making. You can create projects right on your screen using Scratch and Python, connect a speaker to make music with Sonic Pi, and upgrade your skills to physical making using items from around your house.

Here’s James to show you how to build a whoopee cushion using a Raspberry Pi, paper plates, tin foil and a sponge:

Whoopee cushion PRANK with a Raspberry Pi: HOW-TO

Explore the world of Raspberry Pi physical computing with our free FutureLearn courses: http://rpf.io/futurelearn Free make your own Whoopi Cushion resource: http://rpf.io/whoopi For more information on Raspberry Pi and the charitable work of the Raspberry Pi Foundation, including Code Club and CoderDojo, visit http://rpf.io Our resources are free to use in schools, clubs, at home and at events.

Diving deeper

You’ve plundered our projects, you’ve successfully rigged every chair in the house to make rude noises, and now you want to dive deeper into digital making. Good! While you’re digesting your Christmas dinner, take a moment to skim through the Raspberry Pi blog for inspiration. You’ll find projects from across our worldwide community, with everything from home automation projects and retrofit upgrades, to robots, gaming systems, and cameras.

You’ll also find bucketloads of ideas in The MagPi magazine, the official monthly Raspberry Pi publication, available in both print and digital format. You can download every issue for free. If you subscribe, you’ll get a Raspberry Pi Zero W to add to your new collection. HackSpace magazine is another fantastic place to turn for Raspberry Pi projects, along with other maker projects and tutorials.

And, of course, simply typing “Raspberry Pi projects” into your preferred search engine will find thousands of ideas. Sites like Hackster, Hackaday, Instructables, Pimoroni, and Adafruit all have plenty of fab Raspberry Pi tutorials that they’ve devised themselves and that community members like you have created.

And finally

If you make something marvellous with your new Raspberry Pi – and we know you will – don’t forget to share it with us! Our Twitter, Facebook, Instagram and Google+ accounts are brimming with chatter, projects, and events. And our forums are a great place to visit if you have questions about your Raspberry Pi or if you need some help.

It’s good to get together with like-minded folks, so check out the growing Raspberry Jam movement. Raspberry Jams are community-run events where makers and enthusiasts can meet other makers, show off their projects, and join in with workshops and discussions. Find your nearest Jam here.

Have a great festive holiday and welcome to the community. We’ll see you in 2018!

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Journeying with green sea turtles and the Arribada Initiative

Post Syndicated from Alex Bate original https://www.raspberrypi.org/blog/sea-turtles/

Today, a guest post: Alasdair Davies, co-founder of Naturebytes, ZSL London’s Conservation Technology Specialist and Shuttleworth Foundation Fellow, shares the work of the Arribada Initiative. The project uses the Raspberry Pi Zero and camera module to follow the journey of green sea turtles. The footage captured from the backs of these magnificent creatures is just incredible – prepare to be blown away!

Pit Stop Camera on Green Sea Turtle 01

Footage from the new Arribada PS-C (pit-stop camera) video tag recently trialled on the island of Principe in unison with the Principe Trust. Engineered by Institute IRNAS (http://irnas.eu/) for the Arribada Initiative (http://blog.arribada.org/).

Access to affordable, open and customisable conservation technologies in the animal tracking world is often limited. I’ve been a conservation technologist for the past ten years, co-founding Naturebytes and working at ZSL London Zoo, and this was a problem that continued to frustrate me. It was inherently expensive to collect valuable data that was necessary to inform policy, to designate marine protected areas, or to identify threats to species.

In March this year, I got a supercharged opportunity to break through these barriers by becoming a Shuttleworth Foundation Fellow, meaning I had the time and resources to concentrate on cracking the problem. The Arribada Initiative was founded, and ten months later, the open source Arribada PS-C green sea turtle tag was born. The video above was captured two weeks ago in the waters of Principe Island, West Africa.

Alasdair Davies on Twitter

On route to Principe island with 10 second gen green sea #turtle tags for testing. This version has a video & accelerometer payload for behavioural studies, plus a nice wireless charging carry case made by @institute_irnas @ShuttleworthFdn

The tag comprises a Raspberry Pi Zero W sporting the Raspberry Pi camera module, a PiRA power management board, two lithium-ion cells, and a rather nice enclosure. It was built in unison with Institute IRNAS, and there’s a nice user-friendly wireless charging case to make it easy for the marine guards to replace the tags after their voyages at sea. When a tag is returned to one of the docking stations in the case, we use resin.io to manage it, download videos, and configure the tag remotely.

Green Sea Turtle Alasdair Davies Raspberry Pi
Green Sea Turtle Alasdair Davies Raspberry Pi

The tags can also be configured to take video clips at timed intervals, meaning we can now observe the presence of marine litter, plastic debris, before/after changes to the ocean environment due to nearby construction, pollution, and other threats.

Discarded fishing nets are lethal to sea turtles, so using this new tag at scale – now finally possible, as the Raspberry Pi Zero helps to drive down costs dramatically whilst retaining excellent video quality – offers real value to scientists in the field. Next year we will be releasing an optimised, affordable GPS version.

green sea turtle Alasdair Davies Raspberry Pi Arribada Initiative

To make this all possible we had to devise a quicker method of attaching the tag to the sea turtles too, so we came up with the “pit-stop” technique (which is what the PS in the name “Arribada PS-C” stands for). Just as a Formula 1 car would visit the pits to get its tyres changed, we literally switch out the tags on the beach when nesting females return, replacing them with freshly charged tags by using a quick-release base plate.

Alasdair Davies on Twitter

About 6 days left now until the first tagged nesting green sea #turtles return using our latest “pit-stop” removeable / replaceable tag method. Counting down the days @arribada_i @institute_irnas

To implement the system we first epoxy the base plate to the turtle, which minimises any possible stress to the turtles as the method is quick. Once the epoxy has dried we attach the tag. When the turtle has completed its nesting cycle (they visit the beach to lay eggs three to four times in a single season, every 10–14 days on average), we simply remove the base plate to complete the field work.

Green Sea Turtle Alasdair Davies Raspberry Pi
Green Sea Turtle Alasdair Davies Raspberry Pi

If you’d like to watch more wonderful videos of the green sea turtles’ adventures, there’s an entire YouTube playlist available here. And to keep up to date with the initiative, be sure to follow Arribada and Alasdair on Twitter.

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MagPi 65: Newbies Guide, and something brand new!

Post Syndicated from Rob Zwetsloot original https://www.raspberrypi.org/blog/magpi-65/

Hey folks, Rob from The MagPi here! We know many people might be getting their very first Raspberry Pi this Christmas, and excitedly wondering “what do I do with it?” While we can’t tell you exactly what to do with your Pi, we can show you how to immerse yourself in the world of Raspberry Pi and be inspired by our incredible community, and that’s the topic of The MagPi 65, out today tomorrow (we’re a day early because we’re simply TOO excited about the special announcement below!).

The one, the only…issue 65!

Raspberry Pi for Newbies

Raspberry Pi for Newbies covers some of the very basics you should know about the world of Raspberry Pi. After a quick set-up tutorial, we introduce you to the Raspberry Pi’s free online resources, including Scratch and Python projects from Code Club, before guiding you through the wider Raspberry Pi and maker community.

Raspberry Pi MagPi 65 Newbie Guide

Pages and pages of useful advice and starter projects

The online community is an amazing place to learn about all the incredible things you can do with the Raspberry Pi. We’ve included some information on good places to look for tutorials, advice and ideas.

And that’s not all

Want to do more after learning about the world of Pi? The rest of the issue has our usual selection of expert guides to help you build some amazing projects: you can make a Christmas memory game, build a tower of bells to ring in the New Year, and even take your first steps towards making a game using C++.

Raspberry Pi MagPi 65

Midimutant, the synthesizer “that boinks endless strange sounds”

All this along with inspiring projects, definitive reviews, and tales from around the community.

Raspberry Pi Annual

Issue 65 isn’t the only new release to look out for. We’re excited to bring you the first ever Raspberry Pi Annual, and it’s free for MagPi subscribers – in fact, subscribers should be receiving it the same day as their issue 65 delivery!

If you’re not yet a subscriber of The MagPi, don’t panic: you can still bag yourself a copy of the Raspberry Pi Annual by signing up to a 12-month subscription of The MagPi before 24 January. You’ll also receive the usual subscriber gift of a free Raspberry Pi Zero W (with case and cable).  Click here to subscribe to The MagPi – The Official Raspberry Pi magazine.

Ooooooo…aaaaaahhhhh…

The Raspberry Pi Annual is aimed at young folk wanting to learn to code, with a variety of awesome step-by-step Scratch tutorials, games, puzzles, and comics, including a robotic Babbage.

Get your copy

You can get The MagPi 65 and the Raspberry Pi Annual 2018 from our online store, and the magazine can be found in the wild at WHSmith, Tesco, Sainsbury’s, and Asda. You’ll be able to get it in the US at Barnes & Noble and Micro Center in a few days’ time. The MagPi 65 is also available digitally on our Android and iOS apps. Finally, you can also download a free PDF of The MagPi 65 and The Raspberry Pi Annual 2018.

We hope you have a merry Christmas! We’re off until the New Year. Bye!

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Sean Hodgins’ video-playing Christmas ornament

Post Syndicated from Alex Bate original https://www.raspberrypi.org/blog/sean-hodgins-ornament/

Standard Christmas tree ornaments are just so boring, always hanging there doing nothing. Yawn! Lucky for us, Sean Hodgins has created an ornament that plays classic nineties Christmas adverts, because of nostalgia.

YouTube Christmas Ornament! – Raspberry Pi Project

This Christmas ornament will really take you back…

Ingredients

Sean first 3D printed a small CRT-shaped ornament resembling the family television set in The Simpsons. He then got to work on the rest of the components.

Pi Zero and electronic components — Sean Hodgins Raspberry Pi Christmas ornament

All images featured in this blog post are c/o Sean Hodgins. Thanks, Sean!

The ornament uses a Raspberry Pi Zero W, 2.2″ TFT LCD screen, Mono Amp, LiPo battery, and speaker, plus the usual peripherals. Sean purposely assembled it with jumper wires and tape, so that he can reuse the components for another project after the festive season.

Clip of PowerBoost 1000 LiPo charger — Sean Hodgins Raspberry Pi Christmas ornament

By adding header pins to a PowerBoost 1000 LiPo charger, Sean was able to connect a switch to control the Pi’s power usage. This method is handy if you want to seal your Pi in a casing that blocks access to the power leads. From there, jumper wires connect the audio amplifier, LCD screen, and PowerBoost to the Zero W.

Code

Then, with Raspbian installed to an SD card and SSH enabled on the Zero W, Sean got the screen to work. The type of screen he used has both SPI and FBTFT enabled. And his next step was to set up the audio functionality with the help of an Adafruit tutorial.

Clip demoing Sean Hodgins Raspberry Pi Christmas ornament

For video playback, Sean installed mplayer before writing a program to extract video content from YouTube*. Once extracted, the video files are saved to the Raspberry Pi, allowing for seamless playback on the screen.

Construct

When fully assembled, the entire build fit snugly within the 3D-printed television set. And as a final touch, Sean added the cut-out lens of a rectangular magnifying glass to give the display the look of a curved CRT screen.

Clip of completed Sean Hodgins Raspberry Pi Christmas ornament in a tree

Then finally, the ornament hangs perfectly on the Christmas tree, up and running and spreading nostalgic warmth.

For more information on the build, check out the Instructables tutorial. And to see all of Sean’s builds, subscribe to his YouTube channel.

Make

If you’re looking for similar projects, have a look at this tutorial by Cabe Atwell for building a Pi-powered ornament that receives and displays text messages.

Have you created Raspberry Pi tree ornaments? Maybe you’ve 3D printed some of our own? We’d love to see what you’re doing with a Raspberry Pi this festive season, so make sure to share your projects with us, either in the comments below or via our social media channels.

 

*At this point, I should note that we don’t support the extraction of  video content from YouTube for your own use if you do not have the right permissions. However, since Sean’s device can play back any video, we think it would look great on your tree showing your own family videos from previous years. So, y’know, be good, be legal, and be festive.

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The Raspberry Pi Christmas shopping list 2017

Post Syndicated from Alex Bate original https://www.raspberrypi.org/blog/christmas-shopping-list-2017/

Looking for the perfect Christmas gift for a beloved maker in your life? Maybe you’d like to give a relative or friend a taste of the world of coding and Raspberry Pi? Whatever you’re looking for, the Raspberry Pi Christmas shopping list will point you in the right direction.

An ice-skating Raspberry Pi - The Raspberry Pi Christmas Shopping List 2017

For those getting started

Thinking about introducing someone special to the wonders of Raspberry Pi during the holidays? Although you can set up your Pi with peripherals from around your home, such as a mobile phone charger, your PC’s keyboard, and the old mouse dwelling in an office drawer, a starter kit is a nice all-in-one package for the budding coder.



Check out the starter kits from Raspberry Pi Approved Resellers such as Pimoroni, The Pi Hut, ModMyPi, Adafruit, CanaKit…the list is pretty long. Our products page will direct you to your closest reseller, or you can head to element14 to pick up the official Raspberry Pi Starter Kit.



You can also buy the Raspberry Pi Press’s brand-new Raspberry Pi Beginners Book, which includes a Raspberry Pi Zero W, a case, a ready-made SD card, and adapter cables.

Once you’ve presented a lucky person with their first Raspberry Pi, it’s time for them to spread their maker wings and learn some new skills.

MagPi Essentials books - The Raspberry Pi Christmas Shopping List 2017

To help them along, you could pick your favourite from among the Official Projects Book volume 3, The MagPi Essentials guides, and the brand-new third edition of Carrie Anne Philbin’s Adventures in Raspberry Pi. (She is super excited about this new edition!)

And you can always add a link to our free resources on the gift tag.

For the maker in your life

If you’re looking for something for a confident digital maker, you can’t go wrong with adding to their arsenal of electric and electronic bits and bobs that are no doubt cluttering drawers and boxes throughout their house.



Components such as servomotors, displays, and sensors are staples of the maker world. And when it comes to jumper wires, buttons, and LEDs, one can never have enough.



You could also consider getting your person a soldering iron, some helpings hands, or small tools such as a Dremel or screwdriver set.

And to make their life a little less messy, pop it all inside a Really Useful Box…because they’re really useful.



For kit makers

While some people like to dive into making head-first and to build whatever comes to mind, others enjoy working with kits.



The Naturebytes kit allows you to record the animal visitors of your garden with the help of a camera and a motion sensor. Footage of your local badgers, birds, deer, and more will be saved to an SD card, or tweeted or emailed to you if it’s in range of WiFi.

Cortec Tiny 4WD - The Raspberry Pi Christmas Shopping List 2017

Coretec’s Tiny 4WD is a kit for assembling a Pi Zero–powered remote-controlled robot at home. Not only is the robot adorable, building it also a great introduction to motors and wireless control.



Bare Conductive’s Touch Board Pro Kit offers everything you need to create interactive electronics projects using conductive paint.

Pi Hut Arcade Kit - The Raspberry Pi Christmas Shopping List 2017

Finally, why not help your favourite maker create their own gaming arcade using the Arcade Building Kit from The Pi Hut?

For the reader

For those who like to curl up with a good read, or spend too much of their day on public transport, a book or magazine subscription is the perfect treat.

For makers, hackers, and those interested in new technologies, our brand-new HackSpace magazine and the ever popular community magazine The MagPi are ideal. Both are available via a physical or digital subscription, and new subscribers to The MagPi also receive a free Raspberry Pi Zero W plus case.

Cover of CoderDojo Nano Make your own game

Marc Scott Beginner's Guide to Coding Book

You can also check out other publications from the Raspberry Pi family, including CoderDojo’s new CoderDojo Nano: Make Your Own Game, Eben Upton and Gareth Halfacree’s Raspberry Pi User Guide, and Marc Scott’s A Beginner’s Guide to Coding. And have I mentioned Carrie Anne’s Adventures in Raspberry Pi yet?

Stocking fillers for everyone

Looking for something small to keep your loved ones occupied on Christmas morning? Or do you have to buy a Secret Santa gift for the office tech? Here are some wonderful stocking fillers to fill your boots with this season.

Pi Hut 3D Christmas Tree - The Raspberry Pi Christmas Shopping List 2017

The Pi Hut 3D Xmas Tree: available as both a pre-soldered and a DIY version, this gadget will work with any 40-pin Raspberry Pi and allows you to create your own mini light show.



Google AIY Voice kit: build your own home assistant using a Raspberry Pi, the MagPi Essentials guide, and this brand-new kit. “Google, play Mariah Carey again…”



Pimoroni’s Raspberry Pi Zero W Project Kits offer everything you need, including the Pi, to make your own time-lapse cameras, music players, and more.



The official Raspberry Pi Sense HAT, Camera Module, and cases for the Pi 3 and Pi Zero will complete the collection of any Raspberry Pi owner, while also opening up exciting project opportunities.

STEAM gifts that everyone will love

Awesome Astronauts | Building LEGO’s Women of NASA!

LEGO Idea’s bought out this amazing ‘Women of NASA’ set, and I thought it would be fun to build, play and learn from these inspiring women! First up, let’s discover a little more about Sally Ride and Mae Jemison, two AWESOME ASTRONAUTS!

Treat the kids, and big kids, in your life to the newest LEGO Ideas set, the Women of NASA — starring Nancy Grace Roman, Margaret Hamilton, Sally Ride, and Mae Jemison!



Explore the world of wearables with Pimoroni’s sewable, hackable, wearable, adorable Bearables kits.



Add lights and motors to paper creations with the Activating Origami Kit, available from The Pi Hut.




We all loved Hidden Figures, and the STEAM enthusiast you know will do too. The film’s available on DVD, and you can also buy the original book, along with other fascinating non-fiction such as Rebecca Skloot’s The Immortal Life of Henrietta Lacks, Rachel Ignotofsky’s Women in Science, and Sydney Padua’s (mostly true) The Thrilling Adventures of Lovelace and Babbage.

Have we missed anything?

With so many amazing kits, HATs, and books available from members of the Raspberry Pi community, it’s hard to only pick a few. Have you found something splendid for the maker in your life? Maybe you’ve created your own kit that uses the Raspberry Pi? Share your favourites with us in the comments below or via our social media accounts.

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The Pi Towers Secret Santa Babbage

Post Syndicated from Mark Calleja original https://www.raspberrypi.org/blog/secret-santa-babbage/

Tired of pulling names out of a hat for office Secret Santa? Upgrade your festive tradition with a Raspberry Pi, thermal printer, and everybody’s favourite microcomputer mascot, Babbage Bear.

Raspberry Pi Babbage Bear Secret Santa

The name’s Santa. Secret Santa.

It’s that time of year again, when the cosiness gets turned up to 11 and everyone starts thinking about jolly fat men, reindeer, toys, and benevolent home invasion. At Raspberry Pi, we’re running a Secret Santa pool: everyone buys a gift for someone else in the office. Obviously, the person you buy for has to be picked in secret and at random, or the whole thing wouldn’t work. With that in mind, I created Secret Santa Babbage to do the somewhat mundane task of choosing gift recipients. This could’ve just been done with some names in a hat, but we’re Raspberry Pi! If we don’t make a Python-based Babbage robot wearing a jaunty hat and programmed to spread Christmas cheer, who will?

Secret Santa Babbage

Ho ho ho!

Mecha-Babbage Xmas shenanigans

The script the robot runs is pretty basic: a list of names entered as comma-separated strings is shuffled at the press of a GPIO button, then a name is popped off the end and stored as a variable. The name is matched to a photo of the person stored on the Raspberry Pi, and a thermal printer pinched from Alex’s super awesome PastyCam (blog post forthcoming, maybe) prints out the picture and name of the person you will need to shower with gifts at the Christmas party. (Well, OK — with one gift. No more than five quid’s worth. Nothing untoward.) There’s also a redo function, just in case you pick yourself: press another button and the last picked name — still stored as a variable — is appended to the list again, which is shuffled once more, and a new name is popped off the end.

Secret Santa Babbage prototyping

Prototyping!

As the build was a bit of a rush job undertaken at the request of our ‘Director of Vibe’ Emily, there are a few things I’d like to improve about this functionality that I didn’t get around to — more on that later. To add some extra holiday spirit to the project at the last minute, I used Pygame to play a WAV file of Santa’s jolly laugh while Babbage chooses a name for you. The file is included in the GitHub repo along with everything else, because ‘tis the season, etc., etc.

Secret Santa Babbage prototyping

Editor’s note: Considering these desk adornments, Mark’s Secret Santa gift-giver has a lot to go on.

Writing the code for Xmas Mecha-Babbage was fairly straightforward, though it uses some tricky bits for managing the thermal printer. You’ll need to install the drivers to make it go, as well as the CUPS package for managing the print hosting. You can find instructions for these things here, thanks to the wonderful Adafruit crew. Also, for reasons I couldn’t fathom, this will all only work on a Pi 2 and not a Pi 3, as there are some compatibility issues with the thermal printer otherwise. (I also tested the script on a Pi Zero W…no dice.)

Building a Christmassy throne

The hardest (well, fiddliest) parts of making the whole build were constructing the throne and wiring the bear. Using MakerCase, Inkscape, a bit of ingenuity, and a laser cutter, I was able to rig up a Christmassy plywood throne which has a hole through the seat so I could run the wires down from Babbage and to the Pi inside. I finished the throne by rubbing a couple of fingers of beeswax into it; as well as making the wood shine just a little bit and protecting it against getting wet, this had the added bonus of making it smell awesome.

Secret Santa Babbage inside

Next year’s iteration will be mulled wine–scented.

I next soldered two LEDs to some lengths of wire, and then ran the wires through holes at the top of the throne and down the back along a small channel I had carved with a narrow chisel to connect them to the Pi’s GPIO pins. The green LED will remain on as long as Babbage is running his program, and the red one will light up while he is processing your request. Once the red LED goes off again, the next person can have a go. I also laser-cut a final piece of wood to overlay the back of Babbage’s Xmas throne and cover the wiring a bit.

Creating a Xmas cyborg bear

Taking two 6 mm tactile buttons, I clipped the spiky metal legs off one side of each (the buttons were going into a stuffed christmas toy, after all) and soldered a length of wire to each of the remaining legs. Next, I made a small incision into Babbage with my trusty Swiss army knife (in a place that actually made me cringe a little) and fed the buttons up into his paws. At some point in this process I was standing in the office wrestling with the bear and muttering to myself, which elicited some very strange looks from my colleagues.

Secret Santa Babbage throne

Poor Babbage…

One thing to note here is to make sure the wires remain attached at the solder points while you push them up into Babbage’s paws. The first time I tried it, I snapped one of my connections and had to start again. It helped to remove some stuffing like a tunnel and then replace it afterward. Moreover, you can use your fingertip to support the joints as you poke the wire in. Finally, a couple of squirts of hot glue to keep Babbage’s furry cheeks firmly on the seat, and done!

Secret Santa Babbage

Next year: Game of Thrones–inspired candy cane throne

The Secret Santa Babbage masterpiece

The whole build process was the perfect holiday mix of cheerful and macabre, and while getting the thermal printer to work was a little time-consuming, the finished product definitely raised some smiles around the office and added a bit of interesting digital flavour to a staid office tradition. And it also helped people who are new to the office or from other branches of the Foundation to know for whom they will be buying a gift.

Secret Santa Babbage

Ready to dispense Christmas cheer!

There are a few ways in which I’ll polish this project before next year, such as having the script write the names to external text files to create a record that will persist in case of a reboot, and maybe having Secret Santa Babbage play you a random Christmas carol when you squeeze his paw instead of just laughing merrily every time. (I also thought about adding electric shocks for those people who are on the naughty list, but HR said no. Bah, humbug!)

Make your own

The code and laser cut plans for the whole build are available here. If you plan to make your own, let us know which stuffed toy you will be turning into a Secret Santa cyborg! And if you’ve been working on any other Christmas-themed Raspberry Pi projects, we’d like to see those too, so tag us on social media to share the festive maker cheer.

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GPIO expander: access a Pi’s GPIO pins on your PC/Mac

Post Syndicated from Gordon Hollingworth original https://www.raspberrypi.org/blog/gpio-expander/

Use the GPIO pins of a Raspberry Pi Zero while running Debian Stretch on a PC or Mac with our new GPIO expander software! With this tool, you can easily access a Pi Zero’s GPIO pins from your x86 laptop without using SSH, and you can also take advantage of your x86 computer’s processing power in your physical computing projects.

A Raspberry Pi zero connected to a laptop - GPIO expander

What is this magic?

Running our x86 Stretch distribution on a PC or Mac, whether installed on the hard drive or as a live image, is a great way of taking advantage of a well controlled and simple Linux distribution without the need for a Raspberry Pi.

The downside of not using a Pi, however, is that there aren’t any GPIO pins with which your Scratch or Python programs could communicate. This is a shame, because it means you are limited in your physical computing projects.

I was thinking about this while playing around with the Pi Zero’s USB booting capabilities, having seen people employ the Linux gadget USB mode to use the Pi Zero as an Ethernet device. It struck me that, using the udev subsystem, we could create a simple GUI application that automatically pops up when you plug a Pi Zero into your computer’s USB port. Then the Pi Zero could be programmed to turn into an Ethernet-connected computer running pigpio to provide you with remote GPIO pins.

So we went ahead and built this GPIO expander application, and your PC or Mac can now have GPIO pins which are accessible through Scratch or the GPIO Zero Python library. Note that you can only use this tool to access the Pi Zero.

You can also install the application on the Raspberry Pi. Theoretically, you could connect a number of Pi Zeros to a single Pi and (without a USB hub) use a maximum of 140 pins! But I’ve not tested this — one for you, I think…

Making the GPIO expander work

If you’re using a PC or Mac and you haven’t set up x86 Debian Stretch yet, you’ll need to do that first. An easy way to do it is to download a copy of the Stretch release from this page and image it onto a USB stick. Boot from the USB stick (on most computers, you just need to press F10 during booting and select the stick when asked), and then run Stretch directly from the USB key. You can also install it to the hard drive, but be aware that installing it will overwrite anything that was on your hard drive before.

Whether on a Mac, PC, or Pi, boot through to the Stretch desktop, open a terminal window, and install the GPIO expander application:

sudo apt install usbbootgui

Next, plug in your Raspberry Pi Zero (don’t insert an SD card), and after a few seconds the GUI will appear.

A screenshot of the GPIO expander GUI

The Raspberry Pi USB programming GUI

Select GPIO expansion board and click OK. The Pi Zero will now be programmed as a locally connected Ethernet port (if you run ifconfig, you’ll see the new interface usb0 coming up).

What’s really cool about this is that your plugged-in Pi Zero is now running pigpio, which allows you to control its GPIOs through the network interface.

With Scratch 2

To utilise the pins with Scratch 2, just click on the start bar and select Programming > Scratch 2.

In Scratch, click on More Blocks, select Add an Extension, and then click Pi GPIO.

Two new blocks will be added: the first is used to set the output pin, the second is used to get the pin value (it is true if the pin is read high).

This a simple application using a Pibrella I had hanging around:

A screenshot of a Scratch 2 program - GPIO expander

With Python

This is a Python example using the GPIO Zero library to flash an LED:

[email protected]:~ $ export GPIOZERO_PIN_FACTORY=pigpio
[email protected]:~ $ export PIGPIO_ADDR=fe80::1%usb0
[email protected]:~ $ python3
>>> from gpiozero import LED
>>> led = LED(17)
>>> led.blink()
A Raspberry Pi zero connected to a laptop - GPIO expander

The pinout command line tool is your friend

Note that in the code above the IP address of the Pi Zero is an IPv6 address and is shortened to fe80::1%usb0, where usb0 is the network interface created by the first Pi Zero.

With pigs directly

Another option you have is to use the pigpio library and the pigs application and redirect the output to the Pi Zero network port running IPv6. To do this, you’ll first need to set some environment variable for the redirection:

[email protected]:~ $ export PIGPIO_ADDR=fe80::1%usb0
[email protected]:~ $ pigs bc2 0x8000
[email protected]:~ $ pigs bs2 0x8000

With the commands above, you should be able to flash the LED on the Pi Zero.

The secret sauce

I know there’ll be some people out there who would be interested in how we put this together. And I’m sure many people are interested in the ‘buildroot’ we created to run on the Pi Zero — after all, there are lots of things you can create if you’ve got a Pi Zero on the end of a piece of IPv6 string! For a closer look, find the build scripts for the GPIO expander here and the source code for the USB boot GUI here.

And be sure to share your projects built with the GPIO expander by tagging us on social media or posting links in the comments!

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Stretch for PCs and Macs, and a Raspbian update

Post Syndicated from Simon Long original https://www.raspberrypi.org/blog/stretch-pcs-macs-raspbian-update/

Today, we are launching the first Debian Stretch release of the Raspberry Pi Desktop for PCs and Macs, and we’re also releasing the latest version of Raspbian Stretch for your Pi.

Raspberry Pi Desktop Stretch splash screen

For PCs and Macs

When we released our custom desktop environment on Debian for PCs and Macs last year, we were slightly taken aback by how popular it turned out to be. We really only created it as a result of one of those “Wouldn’t it be cool if…” conversations we sometimes have in the office, so we were delighted by the Pi community’s reaction.

Seeing how keen people were on the x86 version, we decided that we were going to try to keep releasing it alongside Raspbian, with the ultimate aim being to make simultaneous releases of both. This proved to be tricky, particularly with the move from the Jessie version of Debian to the Stretch version this year. However, we have now finished the job of porting all the custom code in Raspbian Stretch to Debian, and so the first Debian Stretch release of the Raspberry Pi Desktop for your PC or Mac is available from today.

The new Stretch releases

As with the Jessie release, you can either run this as a live image from a DVD, USB stick, or SD card or install it as the native operating system on the hard drive of an old laptop or desktop computer. Please note that installing this software will erase anything else on the hard drive — do not install this over a machine running Windows or macOS that you still need to use for its original purpose! It is, however, safe to boot a live image on such a machine, since your hard drive will not be touched by this.

We’re also pleased to announce that we are releasing the latest version of Raspbian Stretch for your Pi today. The Pi and PC versions are largely identical: as before, there are a few applications (such as Mathematica) which are exclusive to the Pi, but the user interface, desktop, and most applications will be exactly the same.

For Raspbian, this new release is mostly bug fixes and tweaks over the previous Stretch release, but there are one or two changes you might notice.

File manager

The file manager included as part of the LXDE desktop (on which our desktop is based) is a program called PCManFM, and it’s very feature-rich; there’s not much you can’t do in it. However, having used it for a few years, we felt that it was perhaps more complex than it needed to be — the sheer number of menu options and choices made some common operations more awkward than they needed to be. So to try to make file management easier, we have implemented a cut-down mode for the file manager.

Raspberry Pi Desktop Stretch - file manager

Most of the changes are to do with the menus. We’ve removed a lot of options that most people are unlikely to change, and moved some other options into the Preferences screen rather than the menus. The two most common settings people tend to change — how icons are displayed and sorted — are now options on the toolbar and in a top-level menu rather than hidden away in submenus.

The sidebar now only shows a single hierarchical view of the file system, and we’ve tidied the toolbar and updated the icons to make them match our house style. We’ve removed the option for a tabbed interface, and we’ve stomped a few bugs as well.

One final change was to make it possible to rename a file just by clicking on its icon to highlight it, and then clicking on its name. This is the way renaming works on both Windows and macOS, and it’s always seemed slightly awkward that Unix desktop environments tend not to support it.

As with most of the other changes we’ve made to the desktop over the last few years, the intention is to make it simpler to use, and to ease the transition from non-Unix environments. But if you really don’t like what we’ve done and long for the old file manager, just untick the box for Display simplified user interface and menus in the Layout page of Preferences, and everything will be back the way it was!

Raspberry Pi Desktop Stretch - preferences GUI

Battery indicator for laptops

One important feature missing from the previous release was an indication of the amount of battery life. Eben runs our desktop on his Mac, and he was becoming slightly irritated by having to keep rebooting into macOS just to check whether his battery was about to die — so fixing this was a priority!

We’ve added a battery status icon to the taskbar; this shows current percentage charge, along with whether the battery is charging, discharging, or connected to the mains. When you hover over the icon with the mouse pointer, a tooltip with more details appears, including the time remaining if the battery can provide this information.

Raspberry Pi Desktop Stretch - battery indicator

While this battery monitor is mainly intended for the PC version, it also supports the first-generation pi-top — to see it, you’ll only need to make sure that I2C is enabled in Configuration. A future release will support the new second-generation pi-top.

New PC applications

We have included a couple of new applications in the PC version. One is called PiServer — this allows you to set up an operating system, such as Raspbian, on the PC which can then be shared by a number of Pi clients networked to it. It is intended to make it easy for classrooms to have multiple Pis all running exactly the same software, and for the teacher to have control over how the software is installed and used. PiServer is quite a clever piece of software, and it’ll be covered in more detail in another blog post in December.

We’ve also added an application which allows you to easily use the GPIO pins of a Pi Zero connected via USB to a PC in applications using Scratch or Python. This makes it possible to run the same physical computing projects on the PC as you do on a Pi! Again, we’ll tell you more in a separate blog post this month.

Both of these applications are included as standard on the PC image, but not on the Raspbian image. You can run them on a Pi if you want — both can be installed from apt.

How to get the new versions

New images for both Raspbian and Debian versions are available from the Downloads page.

It is possible to update existing installations of both Raspbian and Debian versions. For Raspbian, this is easy: just open a terminal window and enter

sudo apt-get update
sudo apt-get dist-upgrade

Updating Raspbian on your Raspberry Pi

How to update to the latest version of Raspbian on your Raspberry Pi. Download Raspbian here: More information on the latest version of Raspbian: Buy a Raspberry Pi:

It is slightly more complex for the PC version, as the previous release was based around Debian Jessie. You will need to edit the files /etc/apt/sources.list and /etc/apt/sources.list.d/raspi.list, using sudo to do so. In both files, change every occurrence of the word “jessie” to “stretch”. When that’s done, do the following:

sudo apt-get update 
sudo dpkg --force-depends -r libwebkitgtk-3.0-common
sudo apt-get -f install
sudo apt-get dist-upgrade
sudo apt-get install python3-thonny
sudo apt-get install sonic-pi=2.10.0~repack-rpt1+2
sudo apt-get install piserver
sudo apt-get install usbbootgui

At several points during the upgrade process, you will be asked if you want to keep the current version of a configuration file or to install the package maintainer’s version. In every case, keep the existing version, which is the default option. The update may take an hour or so, depending on your network connection.

As with all software updates, there is the possibility that something may go wrong during the process, which could lead to your operating system becoming corrupted. Therefore, we always recommend making a backup first.

Enjoy the new versions, and do let us know any feedback you have in the comments or on the forums!

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MagPi 64: get started with electronics

Post Syndicated from Rob Zwetsloot original https://www.raspberrypi.org/blog/magpi-64/

Hey folks, Rob here again! You get a double dose of me this month, as today marks the release of The MagPi 64. In this issue we give you a complete electronics starter guide to help you learn how to make circuits that connect to your Raspberry Pi!

The front cover of MagPi 64

MAGPI SIXTY-FOOUUUR!

Wires, wires everywhere!

In the electronics feature, we’ll teach you how to identify different components in circuit diagrams, we’ll explain what they do, and we’ll give you some basic wiring instructions so you can take your first steps. The feature also includes step-by-step tutorials on how to make a digital radio and a range-finder, meaning you can test out your new electronics skills immediately!

Christmas tutorials

Electronics are cool, but what else is in this issue? Well, we have exciting news about the next Google AIY Projects Vision kit, which forgoes audio for images, allowing you to build a smart camera with your Raspberry Pi.

We’ve also included guides on how to create your own text-based adventure game and a kaleidoscope camera. And, just in time for the festive season, there’s a tutorial for making a 3D-printed Pi-powered Christmas tree star. All this in The MagPi 64, along with project showcases, reviews, and much more!

Kaleido Cam

Using a normal web cam or the Raspberry Pi camera produce real time live kaleidoscope effects with the Raspberry Pi. This video shows the normal mode, along with an auto pre-rotate, and a horizontal and vertical flip.

Get The MagPi 64

Issue 64 is available today from WHSmith, Tesco, Sainsbury’s, and Asda. If you live in the US, head over to your local Barnes & Noble or Micro Center in the next few days. You can also get the new issue online from our store, or digitally via our Android and iOS apps. And don’t forget, there’s always the free PDF as well.

Subscribe for free goodies

Want to support the Raspberry Pi Foundation and the magazine, and get some cool free stuff? If you take out a twelve-month print subscription to The MagPi, you’ll get a Pi Zero W, Pi Zero case, and adapter cables absolutely free! This offer does not currently have an end date.

We hope you enjoy this issue!

Nintendo Sixty-FOOOOOOOOOOUR

Brandon gets an n64 for christmas 1998 and gets way too excited inquiries about usage / questions / comments? [email protected] © n64kids.com

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Raspberry Pi clusters come of age

Post Syndicated from Alex Bate original https://www.raspberrypi.org/blog/raspberry-pi-clusters-come-of-age/

In today’s guest post, Bruce Tulloch, CEO and Managing Director of BitScope Designs, discusses the uses of cluster computing with the Raspberry Pi, and the recent pilot of the Los Alamos National Laboratory 3000-Pi cluster built with the BitScope Blade.

Raspberry Pi cluster

High-performance computing and Raspberry Pi are not normally uttered in the same breath, but Los Alamos National Laboratory is building a Raspberry Pi cluster with 3000 cores as a pilot before scaling up to 40 000 cores or more next year.

That’s amazing, but why?

I was asked this question more than any other at The International Conference for High-Performance Computing, Networking, Storage and Analysis in Denver last week, where one of the Los Alamos Raspberry Pi Cluster Modules was on display at the University of New Mexico’s Center for Advanced Research Computing booth.

The short answer to this question is: the Raspberry Pi cluster enables Los Alamos National Laboratory (LANL) to conduct exascale computing R&D.

The Pi cluster breadboard

Exascale refers to computing systems at least 50 times faster than the most powerful supercomputers in use today. The problem faced by LANL and similar labs building these things is one of scale. To get the required performance, you need a lot of nodes, and to make it work, you need a lot of R&D.

However, there’s a catch-22: how do you write the operating systems, networks stacks, launch and boot systems for such large computers without having one on which to test it all? Use an existing supercomputer? No — the existing large clusters are fully booked 24/7 doing science, they cost millions of dollars per year to run, and they may not have the architecture you need for your next-generation machine anyway. Older machines retired from science may be available, but at this scale they cost far too much to use and are usually very hard to maintain.

The Los Alamos solution? Build a “model supercomputer” with Raspberry Pi!

Think of it as a “cluster development breadboard”.

The idea is to design, develop, debug, and test new network architectures and systems software on the “breadboard”, but at a scale equivalent to the production machines you’re currently building. Raspberry Pi may be a small computer, but it can run most of the system software stacks that production machines use, and the ratios of its CPU speed, local memory, and network bandwidth scale proportionately to the big machines, much like an architect’s model does when building a new house. To learn more about the project, see the news conference and this interview with insideHPC at SC17.

Traditional Raspberry Pi clusters

Like most people, we love a good cluster! People have been building them with Raspberry Pi since the beginning, because it’s inexpensive, educational, and fun. They’ve been built with the original Pi, Pi 2, Pi 3, and even the Pi Zero, but none of these clusters have proven to be particularly practical.

That’s not stopped them being useful though! I saw quite a few Raspberry Pi clusters at the conference last week.

One tiny one that caught my eye was from the people at openio.io, who used a small Raspberry Pi Zero W cluster to demonstrate their scalable software-defined object storage platform, which on big machines is used to manage petabytes of data, but which is so lightweight that it runs just fine on this:

Raspberry Pi Zero cluster

There was another appealing example at the ARM booth, where the Berkeley Labs’ singularity container platform was demonstrated running very effectively on a small cluster built with Raspberry Pi 3s.

Raspberry Pi 3 cluster demo at a conference stall

My show favourite was from the Edinburgh Parallel Computing Center (EPCC): Nick Brown used a cluster of Pi 3s to explain supercomputers to kids with an engaging interactive application. The idea was that visitors to the stand design an aircraft wing, simulate it across the cluster, and work out whether an aircraft that uses the new wing could fly from Edinburgh to New York on a full tank of fuel. Mine made it, fortunately!

Raspberry Pi 3 cluster demo at a conference stall

Next-generation Raspberry Pi clusters

We’ve been building small-scale industrial-strength Raspberry Pi clusters for a while now with BitScope Blade.

When Los Alamos National Laboratory approached us via HPC provider SICORP with a request to build a cluster comprising many thousands of nodes, we considered all the options very carefully. It needed to be dense, reliable, low-power, and easy to configure and to build. It did not need to “do science”, but it did need to work in almost every other way as a full-scale HPC cluster would.

Some people argue Compute Module 3 is the ideal cluster building block. It’s very small and just as powerful as Raspberry Pi 3, so one could, in theory, pack a lot of them into a very small space. However, there are very good reasons no one has ever successfully done this. For a start, you need to build your own network fabric and I/O, and cooling the CM3s, especially when densely packed in a cluster, is tricky given their tiny size. There’s very little room for heatsinks, and the tiny PCBs dissipate very little excess heat.

Instead, we saw the potential for Raspberry Pi 3 itself to be used to build “industrial-strength clusters” with BitScope Blade. It works best when the Pis are properly mounted, powered reliably, and cooled effectively. It’s important to avoid using micro SD cards and to connect the nodes using wired networks. It has the added benefit of coming with lots of “free” USB I/O, and the Pi 3 PCB, when mounted with the correct air-flow, is a remarkably good heatsink.

When Gordon announced netboot support, we became convinced the Raspberry Pi 3 was the ideal candidate when used with standard switches. We’d been making smaller clusters for a while, but netboot made larger ones practical. Assembling them all into compact units that fit into existing racks with multiple 10 Gb uplinks is the solution that meets LANL’s needs. This is a 60-node cluster pack with a pair of managed switches by Ubiquiti in testing in the BitScope Lab:

60-node Raspberry Pi cluster pack

Two of these packs, built with Blade Quattro, and one smaller one comprising 30 nodes, built with Blade Duo, are the components of the Cluster Module we exhibited at the show. Five of these modules are going into Los Alamos National Laboratory for their pilot as I write this.

Bruce Tulloch at a conference stand with a demo of the Raspberry Pi cluster for LANL

It’s not only research clusters like this for which Raspberry Pi is well suited. You can build very reliable local cloud computing and data centre solutions for research, education, and even some industrial applications. You’re not going to get much heavy-duty science, big data analytics, AI, or serious number crunching done on one of these, but it is quite amazing to see just how useful Raspberry Pi clusters can be for other purposes, whether it’s software-defined networks, lightweight MaaS, SaaS, PaaS, or FaaS solutions, distributed storage, edge computing, industrial IoT, and of course, education in all things cluster and parallel computing. For one live example, check out Mythic Beasts’ educational compute cloud, built with Raspberry Pi 3.

For more information about Raspberry Pi clusters, drop by BitScope Clusters.

I’ll read and respond to your thoughts in the comments below this post too.

Editor’s note:

Here is a photo of Bruce wearing a jetpack. Cool, right?!

Bruce Tulloch wearing a jetpack

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Community Profile: Matthew Timmons-Brown

Post Syndicated from Alex Bate original https://www.raspberrypi.org/blog/community-profile-matthew-timmons-brown/

This column is from The MagPi issue 57. You can download a PDF of the full issue for free, or subscribe to receive the print edition in your mailbox or the digital edition on your tablet. All proceeds from the print and digital editions help the Raspberry Pi Foundation achieve its charitable goals.

“I first set up my YouTube channel because I noticed a massive lack of video tutorials for the Raspberry Pi,” explains Matthew Timmons-Brown, known to many as The Raspberry Pi Guy. At 18 years old, the Cambridge-based student has more than 60 000 subscribers to his channel, making his account the most successful Raspberry Pi–specific YouTube account to date.

Matthew Timmons-Brown

Matt gives a talk at the Raspberry Pi 5th Birthday weekend event

The Raspberry Pi Guy

If you’ve attended a Raspberry Pi event, there’s a good chance you’ve already met Matt. And if not, you’ll have no doubt come across one or more of his tutorials and builds online. On more than one occasion, his work has featured on the Raspberry Pi blog, with his yearly Raspberry Pi roundup videos being a staple of the birthday celebrations.

Matthew Timmons-Brown

With his website, Matt aimed to collect together “the many strands of The Raspberry Pi Guy” into one, neat, cohesive resource — and it works. From newcomers to the credit card-sized computer to hardened Pi veterans, The Raspberry Pi Guy offers aid and inspiration for many. Looking for a review of the Raspberry Pi Zero W? He’s filmed one. Looking for a step-by-step guide to building a Pi-powered Amazon Alexa? No problem, there’s one of those too.

Make your Raspberry Pi artificially intelligent! – Amazon Alexa Personal Assistant Tutorial

Artificial Intelligence. A hefty topic that has dominated the field since computers were first conceived. What if I told you that you could put an artificial intelligence service on your own $30 computer?! That’s right! In this tutorial I will show you how to create your own artificially intelligent personal assistant, using Amazon’s Alexa voice recognition and information service!

Raspberry Pi electric skateboard

Last summer, Matt introduced the world to his Raspberry Pi-controlled electric skateboard, soon finding himself plastered over local press as well as the BBC and tech sites like Adafruit and geek.com. And there’s no question as to why the build was so popular. With YouTubers such as Casey Neistat increasing the demand for electric skateboards on a near-daily basis, the call for a cheaper, home-brew version has quickly grown.

DIY 30KM/H ELECTRIC SKATEBOARD – RASPBERRY PI/WIIMOTE POWERED

Over the summer, I made my own electric skateboard using a £4 Raspberry Pi Zero. Controlled with a Nintendo Wiimote, capable of going 30km/h, and with a range of over 10km, this project has been pretty darn fun. In this video, you see me racing around Cambridge and I explain the ins and outs of this project.

Using a Raspberry Pi Zero, a Nintendo Wii Remote, and a little help from members of the Cambridge Makespace community, Matt built a board capable of reaching 30km/h, with a battery range of 10km per charge. Alongside Neistat, Matt attributes the project inspiration to Australian student Tim Maier, whose build we previously covered in The MagPi.

Matthew Timmons-Brown and Eben Upton standing in a car park looking at a smartphone

LiDAR

Despite the success and the fun of the electric skateboard (including convincing Raspberry Pi Trading CEO Eben Upton to have a go for local television news coverage), the project Matt is most proud of is his wireless LiDAR system for theoretical use on the Mars rovers.

Matthew Timmons-Brown's LiDAR project for scanning terrains with lasers

Using a tablet app to define the angles, Matt’s A Level coursework LiDAR build scans the surrounding area, returning the results to the touchscreen, where they can be manipulated by the user. With his passion for the cosmos and the International Space Station, it’s no wonder that this is Matt’s proudest build.

Built for his A Level Computer Science coursework, the build demonstrates Matt’s passion for space and physics. Used as a means of surveying terrain, LiDAR uses laser light to measure distance, allowing users to create 3D-scanned, high-resolution maps of a specific area. It is a perfect technology for exploring unknown worlds.

Matthew Timmons-Brown and two other young people at a reception in the Houses of Parliament

Matt was invited to St James’s Palace and the Houses of Parliament as part of the Raspberry Pi community celebrations in 2016

Joining the community

In a recent interview at Hills Road Sixth Form College, where he is studying mathematics, further mathematics, physics, and computer science, Matt revealed where his love of electronics and computer science started. “I originally became interested in computer science in 2012, when I read a tiny magazine article about a computer that I would be able to buy with pocket money. This was a pretty exciting thing for a 12-year-old! Your own computer… for less than £30?!” He went on to explain how it became his mission to learn all he could on the subject and how, months later, his YouTube channel came to life, cementing him firmly into the Raspberry Pi community

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Build a Flick-controlled marble maze

Post Syndicated from Alex Bate original https://www.raspberrypi.org/blog/flick-marble-maze/

Wiggle your fingers to guide a ball through a 3D-printed marble maze using the Pi Supply Flick board for Raspberry Pi!

Wiggle, wiggle, wiggle, wiggle, yeah

Using the Flick, previously seen in last week’s Hacker House’s gesture-controlled holographic visualiser, South Africa–based Tom Van den Bon has created a touch-free marble maze. He was motivated by, if his Twitter is any indication, his love for game-making and 3D printing.

Tom Van den Bon on Twitter

Day 172 of #3dprint365. #3dprinted Raspberry PI Controlled Maze Thingie Part 3 #3dprint #3dprinter #thingiverse #raspberrypi #pisupply

All non-electronic parts of this build are 3D printed. The marble maze sits atop a motorised structure which moves along two axes thanks to servo motors. Tom controls the movement using gestures which are picked up by the Flick Zero, a Pi Zero–sized 3D-tracking board that can detect movement up to 15cm away.

Find the code for the maze, which takes advantage of the Flick library, on Tom’s GitHub account.

Make your own games

Our free resources are a treasure trove of fun home-brew games that you can build with your friends and family.

If you like physical games such as Tom’s gesture-controlled maze, you should definitely check out our Python quick reaction game! In it, players are pitted against each other to react as quickly as possible to a randomly lighting up LED.

raspberry pi marble maze

You can also play solo with our Lights out game, where it’s you against four erratic lights eager to remain lit.

For games you can build on your computer with no need for any extra tech, Scratch games such as our button-smashing Olympic weightlifter and Hurdler projects are perfect — you can play them just using a keyboard and browser!

raspberry pi marble maze

And if you’d like to really get stuck into learning about game development, then you’re in luck! CoderDojo’s Make your own game book guides you through all the steps of building a game in JavaScript, from creating the world to designing characters.

Cover of CoderDojo Nano Make your own game

And because I just found this while searching for image content for today’s blog, here is a photo of Eben’s and Liz’s cat Mooncake with a Raspberry Pi on her head. Enjoy!

A cat with a Raspberry Pi pin on its head — raspberry pi marble maze

Ras-purry Pi?

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piwheels: making “pip install” fast

Post Syndicated from Ben Nuttall original https://www.raspberrypi.org/blog/piwheels/

TL;DR pip install numpy used to take ages, and now it’s super fast thanks to piwheels.

The Python Package Index (PyPI) is a package repository for Python modules. Members of the Python community publish software and libraries in it as an easy method of distribution. If you’ve ever used pip install, PyPI is the service that hosts the software you installed. You may have noticed that some installations can take a long time on the Raspberry Pi. That usually happens when modules have been implemented in C and require compilation.

XKCD comic of two people sword-fighting on office chairs while their code is compiling

No more slacking off! pip install numpy takes just a few seconds now \o/

Wheels for Python packages

A general solution to this problem exists: Python wheels are a standard for distributing pre-built versions of packages, saving users from having to build from source. However, when C code is compiled, it’s compiled for a particular architecture, so package maintainers usually publish wheels for 32-bit and 64-bit Windows, macOS, and Linux. Although Raspberry Pi runs Linux, its architecture is ARM, so Linux wheels are not compatible.

A comic of snakes biting their own tails to roll down a sand dune like wheels

What Python wheels are not

Pip works by browsing PyPI for a wheel matching the user’s architecture — and if it doesn’t find one, it falls back to the source distribution (usually a tarball or zip of the source code). Then the user has to build it themselves, which can take a long time, or may require certain dependencies. And if pip can’t find a source distribution, the installation fails.

Developing piwheels

In order to solve this problem, I decided to build wheels of every package on PyPI. I wrote some tooling for automating the process and used a postgres database to monitor the status of builds and log the output. Using a Pi 3 in my living room, I attempted to build wheels of the latest version of all 100 000 packages on PyPI and to host them on a web server on the Pi. This took a total of ten days, and my proof-of-concept seemed to show that it generally worked and was likely to be useful! You could install packages directly from the server, and installations were really fast.

A Raspberry Pi 3 sitting atop a Pi 2 on cloth

This Pi 3 was the piwheels beta server, sitting atop my SSH gateway Pi 2 at home

I proceeded to plan for version 2, which would attempt to build every version of every package — about 750 000 versions in total. I estimated this would take 75 days for one Pi, but I intended to scale it up to use multiple Pis. Our web hosts Mythic Beasts provide dedicated Pi 3 hosting, so I fired up 20 of them to share the load. With some help from Dave Jones, who created an efficient queuing system for the builders, we were able make this run like clockwork. In under two weeks, it was complete! Read ALL about the first build run drama on my blog.

A list of the mythic beasts cloud Pis

ALL the cloud Pis

Improving piwheels

We analysed the failures, made some tweaks, installed some key dependencies, and ran the build again to raise our success rate from 76% to 83%. We also rebuilt packages for Python 3.5 (the new default in Raspbian Stretch). The wheels we build are tagged ‘armv7l’, but because our Raspbian image is compatible with all Pi models, they’re really ARMv6, so they’re compatible with Pi 3, Pi 2, Pi 1 and Pi Zero. This means the ‘armv6l’-tagged wheels we provide are really just the ARMv7 wheels renamed.

The piwheels monitor interface created by Dave Jones

The wonderful piwheels monitor interface created by Dave

Now, you might be thinking “Why didn’t you just cross-compile?” I really wanted to have full compatibility, and building natively on Pis seemed to be the best way to achieve that. I had easy access to the Pis, and it really didn’t take all that long. Plus, you know, I wanted to eat my own dog food.

You might also be thinking “Why don’t you just apt install python3-numpy?” It’s true that some Python packages are distributed via the Raspbian/Debian archives too. However, if you’re in a virtual environment, or you need a more recent version than the one packaged for Debian, you need pip.

How it works

Now that the piwheels package repository is running as a service, hosted on a Pi 3 in the Mythic Beasts data centre in London. The pip package in Raspbian Stretch is configured to use piwheels as an additional index, so it falls back to PyPI if we’re missing a package. Just run sudo apt upgrade to get the configuration change. You’ll find that pip installs are much faster now! If you want to use piwheels on Raspbian Jessie, that’s possible too — find the instructions in our FAQs. And now, every time you pip install something, your files come from a web server running on a Raspberry Pi (that capable little machine)!

Try it for yourself in a virtual environment:

sudo apt install virtualenv python3-virtualenv -y
virtualenv -p /usr/bin/python3 testpip
source testpip/bin/activate
pip install numpy

This takes about 20 minutes on a Pi 3, 2.5 hours on a Pi 1, or just a few seconds on either if you use piwheels.

If you’re interested to see the details, try pip install numpy -v for verbose output. You’ll see that pip discovers two indexes to search:

2 location(s) to search for versions of numpy:
  * https://pypi.python.org/simple/numpy/
  * https://www.piwheels.hostedpi.com/simple/numpy/

Then it searches both indexes for available files. From this list of files, it determines the latest version available. Next it looks for a Python version and architecture match, and then opts for a wheel over a source distribution. If a new package or version is released, piwheels will automatically pick it up and add it to the build queue.

A flowchart of how piwheels works

How piwheels works

For the users unfamiliar with virtual environments I should mention that doing this isn’t a requirement — just an easy way of testing installations in a sandbox. Most pip usage will require sudo pip3 install {package}, which installs at a system level.

If you come across any issues with any packages from piwheels, please let us know in a GitHub issue.

Taking piwheels further

We currently provide over 670 000 wheels for more than 96 000 packages, all compiled natively on Raspberry Pi hardware. Moreover, we’ll keep building new packages as they are released.

Note that, at present, we have built wheels for Python 3.4 and 3.5 — we’re planning to add support for Python 3.6 and 2.7. The fact that piwheels is currently missing Python 2 wheels does not affect users: until we rebuild for Python 2, PyPI will be used as normal, it’ll just take longer than installing a Python 3 package for which we have a wheel. But remember, Python 2 end-of-life is less than three years away!

Many thanks to Dave Jones for his contributions to the project, and to Mythic Beasts for providing the excellent hosted Pi service.

Screenshot of the mythic beasts Raspberry Pi 3 server service website

Related/unrelated, check out my poster from the PyCon UK poster session:

A poster about Python and Raspberry Pi

Click to download the PDF!

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BitBarista: a fully autonomous corporation

Post Syndicated from Alex Bate original https://www.raspberrypi.org/blog/bitbarista/

To some people, the idea of a fully autonomous corporation might seem like the beginning of the end. However, while the BitBarista coffee machine prototype can indeed run itself without any human interference, it also teaches a lesson about ethical responsibility and the value of quality.

BitBarista

Bitcoin coffee machine that engages coffee drinkers in the value chain

Autonomous corporations

If you’ve played Paperclips, you get it. And in case you haven’t played Paperclips, I will only say this: give a robot one job and full control to complete the task, and things may turn in a very unexpected direction. Or, in the case of Rick and Morty, they end in emotional breakdown.

BitBarista

While the fully autonomous BitBarista resides primarily on the drawing board, the team at the University of Edinburgh’s Center for Design Informatics have built a proof-of-concept using a Raspberry Pi and a Delonghi coffee maker.

BitBarista fully autonomous coffee machine using Raspberry Pi

Recently described by the BBC as ‘a coffee machine with a life of its own, dispensing coffee to punters with an ethical preference’, BitBarista works in conjunction with customers to source coffee and complete maintenance tasks in exchange for BitCoin payments. Customers pay for their coffee in BitCoin, and when BitBarista needs maintenance such as cleaning, water replenishment, or restocking, it can pay the same customers for completing those tasks.

BitBarista fully autonomous coffee machine using Raspberry Pi

Moreover, customers choose which coffee beans the machine purchases based on quality, price, environmental impact, and social responsibility. BitBarista also collects and displays data on the most common bean choices.

BitBarista fully autonomous coffee machine using Raspberry Pi

So not only is BitBarista a study into the concept of full autonomy, it’s also a means of data collection about the societal preference of cost compared to social and environmental responsibility.

For more information on BitBarista, visit the Design Informatics and PETRAS websites.

Home-made autonomy

Many people already have store-bought autonomous technology within their homes, such as the Roomba vacuum cleaner or the Nest Smart Thermostat. And within the maker community, many more still have created such devices using sensors, mobile apps, and microprocessors such as the Raspberry Pi. We see examples using the Raspberry Pi on a daily basis, from simple motion-controlled lights and security cameras to advanced devices using temperature sensors and WiFi technology to detect the presence of specific people.

How to Make a Smart Security Camera with a Raspberry Pi Zero

In this video, we use a Raspberry Pi Zero W and a Raspberry Pi camera to make a smart security camera! The camera uses object detection (with OpenCV) to send you an email whenever it sees an intruder. It also runs a webcam so you can view live video from the camera when you are away.

To get started building your own autonomous technology, you could have a look at our resources Laser tripwire and Getting started with picamera. These will help you build a visitor register of everyone who crosses the threshold a specific room.

Or build your own Raspberry Pi Zero W Butter Robot for the lolz.

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MagPi 63: build the arcade cabinet of your dreams

Post Syndicated from Rob Zwetsloot original https://www.raspberrypi.org/blog/magpi-63/

Hi folks, Rob from The MagPi here! Issue 63 is now available, and it’s a huge one: we finally show you how to create the ultimate Raspberry Pi arcade cabinet in our latest detailed tutorial, so get some quarters and your saw ready.

MagPi 63

Totally awesome video game builds!

The 16-page-long arcade machine instructions cover everything from the tools you need and how to do the woodwork, to setting up the electronics. In my spare time, I pretend to be Street Fighter baddie M. Bison, so I’m no stranger to arcade machines. However, I had never actually built one — luckily, the excellent Bob Clagett of I Like To Make Stuff was generous enough to help out with this project. I hope you enjoy reading the article, and making your own cabinet, as much as I enjoyed writing and building them.

Projects for kids

Retro gaming isn’t the only thing you’ll find in this issue of The MagPi though. We have a big feature called Junior Pi Projects, which we hope will inspire young people to make something really cool using Scratch or Python.

As usual, the new issue also includes a collection of other tutorials for you to follow, for example for building a hydroponic garden, or making a special MIDI box. There are also fantastic maker projects to read up on, and reviews to tempt your wallet.

MagPi 63

The kids are alright

Get The MagPi 63

You can grab The MagPi 63 right now from WH Smith, Tesco, Sainsbury’s, and Asda. If you live in the US, check out your local Barnes & Noble or Micro Center in the next few days. You can also get the new issue online from our store, or digitally via our Android or iOS apps. And don’t forget, there’s always the free PDF as well.

Subscribe for free goodies

Want to support the Raspberry Pi Foundation, the magazine, and get some cool free stuff? If you take out a twelve-month print subscription to The MagPi, you’ll get a Pi Zero W, Pi Zero case, and adapter cables absolutely free! This offer does not currently have an end date.

That’s it for this month! We’re off to play some games.

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Derek Woodroffe’s steampunk tentacle hat

Post Syndicated from Janina Ander original https://www.raspberrypi.org/blog/steampunk-tentacle-hat/

Halloween: that glorious time of year when you’re officially allowed to make your friends jump out of their skin with your pranks. For those among us who enjoy dressing up, Halloween is also the occasion to go all out with costumes. And so, dear reader, we present to you: a steampunk tentacle hat, created by Derek Woodroffe.

Finished Tenticle hat

Finished Tenticle hat

Extreme Electronics

Derek is an engineer who loves all things electronics. He’s part of Extreme Kits, and he runs the website Extreme Electronics. Raspberry Pi Zero-controlled Tesla coils are Derek’s speciality — he’s even been on one of the Royal Institution’s Christmas Lectures with them! Skip ahead to 15:06 in this video to see Derek in action:

Let There Be Light! // 2016 CHRISTMAS LECTURES with Saiful Islam – Lecture 1

The first Lecture from Professor Saiful Islam’s 2016 series of CHRISTMAS LECTURES, ‘Supercharged: Fuelling the future’. Watch all three Lectures here: http://richannel.org/christmas-lectures 2016 marked the 80th anniversary since the BBC first broadcast the Christmas Lectures on TV. To celebrate, chemist Professor Saiful Islam explores a subject that the lectures’ founder – Michael Faraday – addressed in the very first Christmas Lectures – energy.

Wearables

Wearables are electronically augmented items you can wear. They might take the form of spy eyeglasses, clothes with integrated sensors, or, in this case, headgear adorned with mechanised tentacles.

Why did Derek make this? We’re not entirely sure, but we suspect he’s a fan of the Cthulu mythos. In any case, we were a little astounded by his project. This is how we reacted when Derek tweeted us about it:

Raspberry Pi on Twitter

@ExtElec @extkits This is beyond incredible and completely unexpected.

In fact, we had to recover from a fit of laughter before we actually managed to type this answer.

Making a steampunk tentacle hat

Derek made the ‘skeleton’ of each tentacle out of a net curtain spring, acrylic rings, and four lengths of fishing line. Two servomotors connect to two ends of fishing line each, and pull them to move the tentacle.

net curtain spring and acrylic rings forming a mechanic tentacle skeleton - steampunk tentacle hat by Derek Woodroffe
Two servos connecting to lengths of fishing line - steampunk tentacle hat by Derek Woodroffe

Then he covered the tentacles with nylon stockings and liquid latex, glued suckers cut out of MDF onto them, and mounted them on an acrylic base. The eight motors connect to a Raspberry Pi via an I2C 8-port PWM controller board.

artificial tentacles - steampunk tentacle hat by Derek Woodroffe
8 servomotors connected to a controller board and a raspberry pi- steampunk tentacle hat by Derek Woodroffe

The Pi makes the servos pull the tentacles so that they move in sine waves in both the x and y directions, seemingly of their own accord. Derek cut open the top of a hat to insert the mounted tentacles, and he used more liquid latex to give the whole thing a slimy-looking finish.

steampunk tentacle hat by Derek Woodroffe

Iä! Iä! Cthulhu fhtagn!

You can read more about Derek’s steampunk tentacle hat here. He will be at the Beeston Raspberry Jam in November to show off his build, so if you’re in the Nottingham area, why not drop by?

Wearables for Halloween

This build is already pretty creepy, but just imagine it with a sensor- or camera-powered upgrade that makes the tentacles reach for people nearby. You’d have nightmare fodder for weeks.

With the help of the Raspberry Pi, any Halloween costume can be taken to the next level. How could Pi technology help you to win that coveted ‘Scariest costume’ prize this year? Tell us your ideas in the comments, and be sure to share pictures of you in your get-up with us on Twitter, Facebook, or Instagram.

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