Tag Archive for Electronics

HackSpace Magazine, Issue 14

HackSpace Magazine Issue 14This month’s HackSpace Magazines includes my review of an easy-to-use but surprisingly feature-rich robot from Dexter Industries: the BBC micro:bit-powered GiggleBot.

At first glance, the GiggleBot seems like a straightforward two-motor wheeled robot chassis. A closer look, though, reveals where it differs from the norm: RGB LEDs, a built-in line-following sensor, Grove headers for additional hardware, and even a pair of servo headers to add additional motion into the mix.

All this hardware is controlled from a standard BBC micro:bit microcontroller board, and doesn’t interfere with any of its existing components – meaning you’re still free to use the LED matrix display, compass, accelerometer, and Bluetooth radio, the latter even allowing you to use one BBC micro:bit as a handheld remote for another powering the robot.

For the full review you can either pop to your nearest supermarket or newsagent for a print copy of the magazine or, as with all Raspberry Pi Press publications, you can download a Creative Commons licensed digital version free of charge from the official website.

The MagPi, Issue 77

The MagPi Issue 77If you’ve ever wanted to tackle an electronics project but didn’t quite know where to start, my latest article for The MagPi Magazine should get you up and running: it’s a look at resources for learning beginner-level electronics.

Centred, naturally enough, around the Raspberry Pi itself, my feature walks through a number of different resources: books, including Phil King’s Simple Electronics with GPIO Zero, all-in-one electronics kits of components and project sheets, online courses, and video tutorials for everything from connected LEDs and switches to the Raspberry Pi through to core concepts surrounding precisely what electricity is and how it works.

As with all Raspberry Pi Press publications, The MagPi Issue 77 is available for free download under a Creative Commons licence from the official website, or you can pick up physical copies in your favourite newsagent, supermarket, or from the comfort of wherever you are right now via the Raspberry Pi Press Store.

The Official Raspberry Pi Beginner’s Guide

The Official Raspberry Pi Beginner's GuideToday sees the release of The Official Raspberry Pi Beginner’s Guide, my latest educational book on the remarkable single-board computer and its software and the first to be made available for free download and redistribution courtesy of a Creative Commons Attribition-ShareAlike-NoCommercial licence.

Written in partnership with Raspberry Pi Press, The Official Raspberry Pi Beginner’s Guide walks newcomers through a tour of the Raspberry Pi and what it can do, setting up both the hardware and the software, learning how to navigate the Raspbian desktop, how to write programs in Scratch 2 and Python 3, and even building custom circuits that use the Raspberry Pi’s general-purpose input-output (GPIO) header. If that weren’t enough, there are chapters on using the Sense HAT add-on board, the Raspberry Pi Camera Module, and a handy list of additional resources for when you’ve finally exhausted the book itself.

While it’s my name on the cover, this book is very much a team effort. I’d like to thank everyone at Raspberry Pi Press who was involved in its creation, from the authors of the original projects pulled in and updated in this new publication to eternally-patient project editor Phil King, fantastic technical editor Simon Long, amazing illustrator Sam Alder, and a whole host of others without whom the book would be nowhere near as good as it has turned out.

The book is available to buy now in all good newsagents, supermarkets, and bookstores, or direct from Raspberry Pi Press. The digital edition, as a Creative Commons-licensed PDF without any digital rights management (DRM) restrictions, is available from The MagPi website now.

Benchmarking the Raspberry Pi 3 Model A+

Back in March, the release of the Raspberry Pi 3 Model B+—the Pi 3 B+ to its friends—brought a chance to take stock and review just how far the project had come since its launch via a series of benchmarks. Now the launch of the Raspberry Pi 3 Model A+ brings a bold claim: a dramatic drop in size, weight, and price over the Pi 3 B+, but without any loss in performance.

In other words: it’s benchmark time once again.

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Custom PC, Issue 184

Custom PC Issue 184Hobby Tech this month takes a look at a trio of very different products: the Clockwork GameShell modular hand-held console, the Dexter GiggleBot BBC micro:bit-powered robot, and the Coinkite Coldcard hardware cryptocurrency wallet.

First, the Coldcard. Designed by the company behind the Opendime (reviewed in Issue 175, and dead due to an apparent design flaw a week later), the Coldcard is roughly the size of a small stack of credit cards but provides a full hardware wallet for the Bitcoin and Litecoin cryptocurrencies. At least, that’s the theory: sadly, in practice, the device proved difficult to use owing to software glitches, hardware flaws, and a lack of third-party software support which reduces you to using only one wallet package to interface with the Coldcard.

The GiggleBot, by contrast, is a significantly more polished product. While the documentation still needs work, the robot itself – featured two individually-addressable motors, a line- or light-following sensor board, RGB LEDs, and expansion potential from Grove-compatible connectors and a pair of servo headers – is exceptionally impressive, and a great introduction to basic robotics for younger programmers. Those looking to make the leap from the block-based MakeCode environment to Python, though, will discover that the two libraries are far from equivalent in terms of feature availability – something that, again, will hopefully be addressed in the future.

Finally, the Clockwork GameShell. Produced following a successful crowdfunding campaign, the device is based around a Raspberry Pi-like single-board computer dubbed the Clockwork Pi and runs a customised Linux distribution with neat menu system. Its internals, interestingly, are modular, with each contained inside a snap-together transparent plastic housing – a decision which makes for a slightly bulky Game Boy-like outer shell and, sadly, is the direct cause of some overheating problems for the system-on-chip (SoC) during more intensive games like Quake. These issues, though, are largely outweighed by sheer novelty value: a few minutes of FreeDoom in the palm of your hand is sure to raise a smile.

The full reviews can be read in Custom PC Issue 184, available from your nearest supermarket, newsagent, or digitally via Zinio and similar services.

Custom PC, Issue 183

Custom PC Issue 183In Hobby Tech this month, there’s a look at a project which has genuinely transformed my mornings, a tiny temperature-controlled soldering iron with a hackable firmware, and the latest brain-melting program-’em-up from Zachtronics.

Starting with the game first, Exapunks caught my eye as soon as I saw it announced by developer Zachtronics. Taking the assembler programming concept of earlier titles TIS-100 and Shenzhen-IO, Exapunks wraps them up in a 90s near-future cyberpunk aesthetic alongside a plot driven by a disease called “the phage” which turns victims into non-functional computers. Because of course it does.

Anyone familiar with Zachtronics’ work will know what to expect, but Exapunks really dials things up. From the puzzles themselves – including one inspired by an early scene in the classic film Hackers – to, in a first for the format, the introduction of real though asynchronous multiplayer on top of the standard leaderboard metrics, Exapunks excels from start to oh-so-tricky finish.

The MiniWare TS100 soldering iron, meanwhile, sounds like it could be straight from Exapunks – or, given its name, TS-100: a compact temperature-controlled soldering iron with built-in screen and an open-source firmware you can hack to control everything from default operating temperature to how long before it enters power-saving “sleep mode.” While far from a perfect design – and since supplanted by the TS80, not yet available from UK stockists – the TS100 is an interesting piece of kit, with its biggest flaw being the need to use a grounding strap to avoid a potentially component-destroying floating voltage at the iron’s tip.

Finally, the project: an effort, using only off-the-shelf software tied together in a Bash shell script, to print out a schedule of the days’ tasks on my Dymo LabelWriter thermal printer. Using the code detailed in the magazine, the project pulls together everything from weather forecasts to my ongoing tasks and Google Calendar weekly schedule – along with a word of the day and, just because, a fortune cookie read out by an ASCII-art cow.

All this, and a variety of other topics, is available in the latest Custom PC Magazine on newsagent and supermarket shelves or electronically via Zinio and similar services.

Custom PC, Issue 181

Custom PC Issue 181In this month’s Hobby Tech column I take a look at two LED-adorned educational electronics kits, the Kitronik :GAME ZIP 64 and the Kano Pixel Kit, along with Mark Hardisty’s latest retrogaming project, The Classic Adventurer.

Kitronik’s :GAME ZIP 64, which will henceforth be known as the much easier to both read and type Game Zip 64, is a clever little add-on for the BBC micro:bit educational platform. Designed to mate with the BBC micro:bit’s edge connector, the Game Zip 64 adds 64 individually-addressable RGB LEDs, a major upgrade on the single-colour 25-LED matrix on the BBC micro:bit itself, buttons to form a four-way directional control pad, two fire buttons, a piezoelectric buzzer, and – interestingly – a vibration motor.

While the sample Python programs – Snake and Pong – are pretty poor, Kitronik has produced a series of lesson plans around the device which are absolutely fantastic, and put the £40 asking price well into ‘bargain’ territory for anyone looking to move on from the built-in features of the bare BBC micro:bit itself.

The Kano Pixel Kit is, on the face of it, a similar device: a matrix of 128 LEDs – twice the number of the Game Zip 64 – dominate the front, but control is limited to a function dial and a couple of buttons. It’s also Kano’s first truly standalone product, eschewing the normal Raspberry Pi for an on-board Espressif ESP-WROOM-32 microcontroller. As with the Kano Computer Kit, the Pixel Kit’s software – which, sadly, is not available for mainstream Linux, despite coming in a Raspberry Pi variant – is fantastic, but its development cost is likely behind the eyebrow-raising £75 asking price.

Finally, Mark Hardisty’s latest project – after putting his groundbreaking tome on the history of Gremlin Graphics to bed and recreating some classic artwork in Inlay – is The Classic Adventurer, a magazine dedicated to the glory days of interactive fiction. Available in print and also, all credit to him, as a free-as-in-beer DRM-unencumbered PDF download, each issue is packed with brilliant art and fascinating articles ranging from interviews to reviews with some behind-the-scenes stuff thrown in for good measure. It’s a fantastic project, and definitely one to follow.

All this, plus the usual raft of other people’s work, can be found at your nearest newsagent, supermarket, or electronically via Zinio and similar digital distribution platforms.


Custom PC, Issue 179

Custom PC Issue 179This month’s Hobby Tech column takes a look at an open-source microcontroller-driven hobbyist oscilloscope and a book which aims to document art in video games, while also walking readers through the rather handy trick of setting up a reverse SSH tunnel.

First, the tutorial. Since Code42 announced that CrashPlan Home, my chosen off-site backup solution, was being discontinued, I’ve been looking into alternatives. A Raspberry Pi with a USB hard drive and a copy of Syncthing installed does the job nicely, except for the issue of management: once it’s off-site, I’d have to configure someone else’s router to forward a port so I can SSH into it. An easier alternative: a reverse SSH tunnel.

Where a traditional SSH connection goes from local device to remote host, a reverse tunnel goes from remote device to an intermediary device – in my case, a home server on my own network. Your local device then also connects to said intermediary device, and you have full access to the remote device regardless of whether or not it’s behind one or more firewalls or even whether you know its public-facing IP address.

The first of the reviews, meanwhile, is a little cheeky: while the device on test is based on the JYE Tech DSO138 open-source oscilloscope design and firmware, I’ve been using a clone rather than an original – having spotted it on offer during an Amazon sale and been unable to resist a bargain. While the conclusions I draw on the scope’s functionality and usability apply equally to both, a first-party JYE Tech version is likely to feature better build quality and certainly includes better support.

Finally, my review of the coffee table tome – yes, another one – Push Start: The Art of Video Games is one of those rare occasions where I’ve been disappointed by what should have been a product aiming for a very low bar. While the full-colour hardback publication includes plenty of high-quality pictures, it also includes some extremely low-quality screenshots as well – particularly noticeable at the beginning where vector games are captured as bitmaps using MAME’s default ultra-low resolution, and at the end where tell-tale artefacts show the use of third-party JPEG images rather than first-party captures. Worse still is the limited accompanying text, which is riddled with errors.

The latest Hobby Tech is available now from newsagents, supermarkets, and electronically via Zinio and similar digital distribution services.

Custom PC, Issue 178

Custom PC Issue 178This month’s Hobby Tech has a pair of two-page spreads on two very exciting, yet decidedly different, pieces of hardware – the Raspberry Pi 3 Model B+ and the Gamebuino Meta – along with a look at an update to the Arduino Create platform which brings early support for single-board computers.

First, the Raspberry Pi 3 Model B+. As the name suggests, the new board isn’t quite a full generation above the existing Raspberry Pi 3 Model B. It is, however, a considerable upgrade – primarily thanks to a new packaging for the BCM2837 system-on-chip, now known as the BCM2837B0, which vastly improves its thermal performance and boosts its speed from 1.2GHz to 1.4GHz. Elsewhere, the board includes an upgraded and simplified power supply system, gigabit Ethernet – though limited to around 230Mb/s throughput in real-world terms – and dual-band 802.11ac wireless network capabilities. Naturally, the review also includes thermal imaging analysis – this time using a new overlay technique which, I’m pleased to say, offers a significant improvement in image clarity over my previous approaches.

The Gamebuino Meta, on the other hand, is a very different device to its predecessor. Upgraded from an ATmega microcontroller to an Arm chip, the Gamebuino Meta boasts a colour screen, programmable RGB LED lighting, a general-purpose input/output (GPIO) header with ‘developer backpack’ accessory for easy prototyping – in short, it’s a serious upgrade over the device I reviewed back in Issue 134. Despite the upgrades, though, it’s still extremely accessible, allowing users to write their own games using the Arduino IDE and the Gamebuino library with ease.

Finally, Arduino Create. I’ve been meaning to take a look at the cloud-based development environment for a while, but it wasn’t until it added support for single-board computers like the Raspberry Pi – on top of the Arduino boards it already supported – that I found an excuse to dive in. What I found is somewhat rough around the edges, but shows promise: a fully-functional IDE right in the browser, but with the ability to push sketches – with very little modification for the Raspberry Pi – to devices remotely.

All this, plus the usual raft of things I didn’t write, can be found between the crisp paper covers of Custom PC Issue 178 at your nearest supermarket, newsagent, or electronically via Zinio and similar digital distribution services.

Custom PC, Issue 173

Custom PC Issue 173This month’s Hobby Tech column takes a look at the learn-by-post Tron-Club Electronics Kits, the excellent Core Memory, and revisits one of the biggest disappointments of the year: the Asus Tinker Board.

First, the re-review. I originally tested the Asus Tinker Board – or Tinkerboard, or TinkerBoard, depending on which piece of documentation you’re reading – back in Issue 164 when it first hit the market. At the time, the device was impossible to recommend: the top-end hardware, capable of outperforming even the latest Raspberry Pi 3 against which it is designed to compete, was let down by woeful and unfinished software. Nine months on, I decided to give Asus a second chance and load the latest software to see if anything had improved – and I’m pleased to say that many, though far from all, of the issues I had back in March have been addressed.

The Tron-Club Electronics Kits, meanwhile, are smart subscription packages supplied monthly with a claimed minimum of 21 circuits in every pack. Based around discrete components in the Basic Kits and a microcontroller in the Advanced Kits, I was lucky enough to receive a sample of both from Bit-Tech forumite Byron Collier who had finished with them himself.

Finally, Core Memory. Continuing my trend to buy coffee table books despite not actually having a coffee table, I picked up Mark Richard and John Alderman’s book – subtitled “A Visual History of Vintage Computers” – a few years ago, and while it’s now out of print it is still readily available from Amazon and other retailers and, frankly, well worth the cash, despite a few errors in Alderman’s supporting text.

All this, and the usual collection of things written by people who aren’t me, is available from your nearest newsagent, supermarket, or electronically via Zinio and similar digital distribution platforms.