E-Paper Anniversary Counter Is A Charming Gift With Minimal Power Draw

December 23, 2024 by Lewin Day 4 Comments

[Lonyelon] wanted to build an anniversary gift for his girlfriend. He decided to say it with e-Paper, a wise choice given its persistence and longevity.

The project is an anniversary calendar. It displays a counter of the total time the couple has been together, measured in years, months, days, and hours—so it’s remarkably precise. [Lonyelon] also programmed it to display additional counters to create plenty of additional fun anniversaries—the couple can celebrate milestones like their 1000th day together, for example. It also cycles through a range of cute messages and displays photos of the couple together.

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Happy Birthday, Tetris!

June 8, 2024 by Elliot Williams 6 Comments

Porting DOOM to everything that’s even vaguely Turing complete is a sport for the advanced hacker. But if you are just getting started, or want to focus more on the physical build of your project, a simpler game is probably the way to go. Maybe this explains the eternal popularity of games like PONG, Tetris, Snake, or even Pac-Man. The amount of fun you can have playing the game, relative to the size of the code necessary to implement them, make these games evergreen.

Yesterday was Tetris’ 40th birthday, and in honor of the occasion, I thought I’d bring you a collection of sweet Tetris hacks.

On the big-builds side of things, it’s hard to beat these MIT students who used colored lights in the windows of the Green Building back in 2012. They apparently couldn’t get into some rooms, because they had some dead pixels, but at that scale, who’s complaining? Coming in just smaller, at the size of a whole wall, [Oat Foundry]’s giant split-flap display Tetris is certainly noisy enough.

Smaller still, although only a little bit less noisy, this flip-dot Tetris is at home on the coffee table, while this one by [Electronoobs] gives you an excuse to play around with RGB LEDs. And if you need a Tetris for your workbench, but you don’t have the space for an extra screen, this oscilloscope version is just the ticket. Or just play it (sideways) on your business card.

All of the above projects have focused on the builds, but if you want to tackle your own, you’ll need to spend some time with the code as well. We’ve got you covered. Way back, former Editor in Chief [Mike Szczys] ported Tetris to the AVR platform. If you need color, this deep dive into the way the NES version of Tetris worked also comes with demo code in Java and Lua. TetrOS is the most minimal version of the game we’ve seen, coming in at a mere 446 bytes, but it’s without any of the frills.

No Tetris birthday roundup would be complete without mentioning the phenomenal “From NAND to Tetris” course, which really does what it says on the package: builds a Tetris game, and your understanding of computing in general, from the ground up.

Can you think of other projects to celebrate Tetris’ 40th? We’d love to see your favorites!

XML Is A Quarter Century Old

February 11, 2023 by Jenny List 58 Comments

For those of us who have spent entire careers working with structured data, it comes as something of a surprise to be reminded that XML is now 25 years old. You probably missed the XML standard on the 10th of February 1998, but it’s almost certain that XML has touched your life in many ways even if you remain unaware of it.

The idea of one strictly compliant universal markup language to rule them all was extremely interesting in an era when the Internet was becoming the standard means to interchange information and when the walled gardens dating back to the mini- and mainframe era were being replaced with open standards-based interchange. In the electronic publishing industry, it allowed encyclopedia and dictionary-sized data sets to be defined to a standard format and easily exchanged. At a much smaller level, it promised a standard way to structure more mundane transactions. Acronyms and initialisms such as WAP, SOAP, and XHTML were designed to revolutionize the Web of the 21st century, but chances are that those are familiar only to the more grizzled developers.

In practice the one-size-fits-all approach of XML left it unwieldy, giving the likes of JSON and HTML4 the opening to be the standards we used. That’s not to say XML isn’t hiding in plain sight though, it’s the container for the SVG graphics format. Go on — tell us where else XML can be found, in the comments!

So, XML. When used to standardise large structured datasets it can sometimes be enough to bring the most hardened of developers to tears, but it remains far better than what went before. When hammered to fit into lightweight protocols though, it’s a pain in the backside and is best forgotten. It’s 25 years old, and here to stay!

Header: [Jh20], GFDL v1.2.

Atari At 50: The Story Of Our Lives

June 27, 2022 by Jenny List 14 Comments

It’s been a year of anniversaries, what with the 40th birthday of both the Commodore 64 and the Sinclair ZX Spectrum. But there’s another anniversary that in a sense tops them all, today marks 50 years since Nolan Bushnell and Ted Dabney incorporated Atari Inc, a name that will forever be synonymous with the development of the computer game industry. PC Magazine have marked the event with a retrospective, an affectionate look at the progress from Spacewar! coin-ops to the unsuccessful Jaguar console of the 1990s, and it pulls no punches over the lacklustre management that oversaw its decline in later years.

For us the high points of the Atari story were the VCS console and the ST line of computers, which probably best represent the brand’s successes in Europe where this is being written. It’s with something of a wince that we remember watching an Atari Lynx advert in a British cinema, in which the laugh came when the teenager-unaffordably high price was revealed. At least diehard Atari fans can take solace in that by then Commodore was equally being run into the ground.

One criticism PC Magazine makes is that the current Atari incarnation is doing little beyond rehashing past glories, and perhaps they’re right. Last year we covered their release of some new cartridges for the VCS.

You Have About Four Months To Find A Lost Satellite

June 13, 2021 by Jenny List 10 Comments

In the annals of technical achievement originating from the United Kingdom there lies a forgotten success story that should have led to greater things but instead became a dead-end even before it had happened. We’re referring of course to Prospero, a British satellite that holds the honour of being the only one to have been launched on board a British-developed satellite launch platform. On the 28th of October 1971 it was launched aboard a Black Arrow rocket from the Woomera launch site in Australia and successfully entered orbit to complete its mission. When it was launched the Black Arrow program had already been canceled by the British government, with the launch proceeding only because rocket and satellite were by then already on the pad.

So the Brits became the sixth nation to develop a satellite launch capability, and promptly canned it. Prospero was a success though and remains in orbit, and was even re-activated periodically as late as the 1990s. With its fiftieth anniversary approaching in October we think it’s worth looking for to mark the occasion, and so would like to remind you of its existence and the impending anniversary. If any community can find a lost satellite, hear its call if it is still transmitting anything, and maybe even wake it up, it’s you lot. Hackaday readers never cease to amaze us with their talents, and we know that among you will be people with what it takes to find Prospero.

To help you along your way there’s a lot of information about the satellite to be found online, including the details of an unsuccessful attempt to contact it a decade ago for the anniversary in 2011, and a real-time tracker to help you find its position. Maybe some of you have a decent enough telescope to take a snap of it as it passes over, but if a radio signal could be retrieved from it that would be particularly impressive. Watch out though, you might find yourself hearing an Orbcomm satellite on the same frequency.

So if any of you fancy firing up your SDRs and pointing an antenna skywards over the next few months, we’d like to hear about your progress. It’s possible that the craft may by now be incapable of life, but if anything can be found it’s worth a try.

This isn’t the first satellite rescue attempt documented here on Hackaday. A few years back we put out the call to rescue ICE/ISEE-3.

Celebrating The 4004’s 0x31st Anniversary

November 16, 2020 by Chris Lott 5 Comments

This weekend marked the 49th anniversary of the legendary Intel 4004 microprocessor, and to celebrate [Erturk Kocalar] combined the old and new in this intriguing Retroshield 4004 / Busicom 141-PF calculator project. We have reported on his Arduino shield project before, which lets you connect a variety of old microprocessors to an Arduino so you can experiment with these old chips with a minimum of fuss.

[Erturk] decided to use the Arduino to simulate the hardware of the Busicom 141-PF, a calculator famous for bringing us the microprocessor. In addition to the calculator, the Arduino has to simulate the Intel 4004 CPU’s supporting chips, which include ROM, RAM, and shift registers. If you want to build one of these yourself, all the design files are open source, or you can get an assembled shield from his Tindie store. In either case, you will have to provide your own 4004, which are surprisingly still available. (Tindie and Hackaday share the same parent company, Supplyframe. We’ve got nothing to do with Intel.)

We really appreciate the detailed explanation that [Erturk] provides about the inner workings of the calculator. Interfacing the emulator to the original ROM code running on the 4004 is non-trivial — take a look at the explanation of the spinning drum printer, for example. We enjoyed perusing the annotated ROM listing, as well as reading the story of the efforts which have been undertaken to prevent these historical documents from being lost forever. Be sure to check out the history of the 4004 and its inventor Federico Faggin if you’d like to delve deeper.

Plastic Model Emulates The First Untethered Spacewalk

February 11, 2018 by Donald Papp 18 Comments

Here’s something really wonderful. [Dave Akerman] wrote up the results of his attempt to use a high-altitude balloon to try to re-create a famous image of NASA’s Bruce McCandless floating freely in space with the Earth in the background. [Dave] did this in celebration of the 34th anniversary of the first untethered spacewalk, even going so far as to launch on the same day as the original event in 1984. He had excellent results, with plenty of video and images recorded by his payload.

Adhering to the actual day of the spacewalk wasn’t the only hurdle [Dave] jumped to make this happen. He tracked down an old and rare “Astronaut with MMU” (Mobile Maneuvering Unit) plastic model kit made by Revell USA and proceeded to build it and arrange for it to remain in view of the cameras. Raspberry Pi Zero Ws with cameras, LoRA hardware, action cameras, and a UBlox GPS unit all make an appearance in the balloon’s payload.

Sadly, [Bruce McCandless] passed away in late 2017, but this project is a wonderful reminder of that first untethered spacewalk. Details on the build and the payload, as well as the tracking system, are covered here on [Dave]’s blog. Videos of the launch and the inevitable balloon burst are embedded below, but more is available in the summary write-up.

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