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Hackaday Links: February 10, 2019

February 10, 2019 by 20 Comments

Last month was NAMM, the National Association of Musical Something that begins with ‘M’, which means we’re synthed and guitarded out for the year. The synth news? Behringer are making cheap reproductions and clones of vintage gear. There’s something you need to know about vintage gear: more than half of everything produced today has a Roland 808 or 909 drum machine (or sample), a 303 bass synth, or a 101 mono synth in it. Put an 808, 909, 303, and 101 on the same table, connected to a mixer, and you can make most of the electronic music from the ’80s and ’90s. And Behringer is cloning these synths. Neat times. But there’s a problem: Roland is trademarking these drum machines and synths, with trademark filings in the US and Germany. These are ‘trade dress’, or basically the beautiful red, orange, yellow, and white buttons of the 808 and the digital cyber silver plastic aesthetic of the 303, but there you go. It’s round one in the Roland v. Behringer match, may the first person to give me an 808, 909, 303, and 101 for a thousand dollars win.

Synths? Sure thing. Here’s a stash of New Old Stock 8580 SID chips, the ‘synth on a chip’ found in the Commodore 64. The price? $50. [ben] bought one of these, and the card that came with it said,  “We purchased these chips in 2006 and they’ve been stored in our climate-controlled storage area ever since. Even still, we found a handful of them that didn’t pass testing. Treat them with care!” Yes, a bunch of SID chips for sale is noteworthy, but at $50 a piece for 1980s technology, can someone explain why a chip fab isn’t cranking these things out? If there’s one ancient piece of silicon where the demand meets what it would cost to spin up the silicon line, the SID is it. Where are the modern reproductions?

Excited about making an electronic badge this year? Seeed is offering badge sponsorships for 2019, with an offer of a 5% discount on PCBA, and a 10% discount if you put the Seeed logo on the board. I might be a little biased, but Seeed is a place where you can just ask, “hey, you guys do clear soldermask?” and they find a way to do it.

The best way to tell if someone is rich isn’t by seeing if they have an i8 parked outside their mansion, or just a piece of junk with an M badge. It isn’t whether or not their filet mignon is wagyu or just Kobe, and it isn’t if they’re cruising the skies in a G650 or just puttering around in a Cessna Citation. No, the best way to tell if someone is rich is to notice their AirPods. Yes, Apple’s wireless headphones (which are actually pretty good!) are the best foundation of a class division these days. The best class signal since private railroad cars now has a problem: people are printing their own AirPods. [Brady32] over on Thingiverse has modeled AirPods, and now the design is being given away for free. The horror. Now anyone can print out their own little bits of white plastic, stick them in their ears, and tell the world, ‘I’m better than you. Don’t bother talking back, because I obviously can’t hear you.’

Raspberry Pi has a store! Yes, everyone’s favorite single board computer now has an ‘experimental space’ in Cambridge’s Grand Arcade. The Beeb is saying this store is ‘bucking the retail trend’, yes, but any retail trend doesn’t really apply here; brands have storefronts, and it’s not about revenue per square foot. Makerbot had a store, and it wasn’t about selling printers. Microsoft has stores. Sony built a mall to advertise the original PlayStation. While the Raspberry Pi brick and mortar store will probably never make any money, it is an indication the Raspberry Pi foundation has built a valuable brand worthy of celebration. Here’s some pics of the store itself.

Did you know Hackaday has a retro edition? It’s true! retro.hackaday.com is a lo-fi version of Hackaday without CSS or Javascript or any other cruft. It’s hand-written HTML (assembled by a script) of the first ten thousand or so Hackaday posts. The idea is that old computers could load the retro site, just to prove they could. [Matthias Koch] has an Atari PC3 — Atari’s PC compatible with an 8088 running at 8Mhz, 640k of RAM and a 20 MB hard drive — and got this thing to pull up the retro site. Good work!

What is the current state of 3D printing? What is the current state of 3D printing videos on YouTube? Oh boy we’re going to find out. [Potent Printables] did an ‘analysis’ of 3D printing videos published to YouTube, and found the category riddled with ‘clickbait’, without giving an operational definition of what ‘clickbait’ actually is, or how it’s different from any other content (because who would make a video that doesn’t have the purpose of attracting viewers) Anyway, there’s a problem with the YouTube algorithm, and 3D printing blogs are copying it, filling the entire hobby with disillusioned beginners, or something. After defining ‘The Most Viewed’ as not being a news or documentary footage (okay, that’s fair), having at least three printing videos, not clickbait, and gives the designer proper attribution, [Potent Printables] found a list filled with [Maker’s Muse], [3D Print Guy] and other channels who do 3D printing work, but don’t put 3D printing in the title. This is great; 3D printing isn’t a fascinating new technology that’s the first step towards Star Trek replicators; we’ve slid down the trough of disillusionment and now 3D printers are just tools. It’s great, and in 2018 things are as they should be.

Make Your Lego Fly

February 10, 2019 by 8 Comments

We probably all used to make our Lego fly by throwing it across the room, but Flite Test have come up with a slightly more elegant solution: they converted a Lego quadcopter to fly. They did it by adding a  miniature flight controller, battery and motors/rotors to replace the Lego ones in the Lego City Arctic Air Transport kit. This combination flies surprisingly well, thanks to a thoughtful design that balances the heavier components inside the case.

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There Are 200 Electronic Kits In That Box

February 10, 2019 by 90 Comments

If you grew up in the latter part of the 20th century, you didn’t have the Internet we have today — or maybe not at all. What you did have, though, was Radio Shack within an hour’s drive. They sold consumer electronics, of course, but they also sold parts and kits. In addition to specific kits, they always had some versions of a universal kit where lots of components were mounted on a board and you could easily connect and disconnect them to build different things. [RetoSpector78] found a 200-in-1 kit at a thrift store that was exactly like the one he had as a kid and he shares it with us in the video below.

This was a particularly fancy model since it has a nice looking front panel with a few knobs and displays. The book shows you how to make the 200 different projects ranging from metronomes to rain detectors. The projects really fell into several categories. There were practical circuits like radio receivers, test equipment, and transmitters. Then there were games or circuits even the manual called “silly.” In addition, there were circuits to build simply to understand how they work, like flip flops or counters.

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This 3D Printed LED Softbox Really Shines

February 10, 2019 by 8 Comments

Generally speaking, objects made on desktop 3D printers are pretty small. This is of course no surprise, as filament based printers are fairly slow and most don’t have very large beds to begin with. Most people don’t want to wait days for their project to complete, so they use 3D printed parts where it makes sense and supplement them with more traditional components such as aluminum extrusion wherever possible. But not always…

This 3D printed photography softbox created by [Nicholas Sherlock] doesn’t take the easy way out for anything. With the exception of the LEDs and the electronics to drive them, everything in the design has been printed on his Prusa i3. It wasn’t the easiest or fastest way to do it, but it’s hard to argue with the end result. Perhaps even more impressive than the final product is what it took to get there: he actually had to develop a completely new style of part infill he’s calling “Scattered Rectilinear” to pull it off.

Overall the design of the light itself isn’t that complex, ultimately it’s just a box with some LEDs mounted at the back and a pretty simple circuit to control their intensity. The critics will say he could have just used a cardboard box, or maybe wood if he wanted something a little bit stronger. But the point of this project was never the box itself, or the LEDs inside it. It’s all about the diffuser.

[Nicholas] forked Prusa’s version of Slic3r to add in his “Scattered Rectilinear” infill pattern, which is specifically designed to avoid the standard “ribs” inside of a 3D printed object. This is accomplished with randomized straight infill passes, rather than the traditionally overlapped ones. The inside of the print looks very reminiscent of fiberglass mat, which is perhaps the best way to conceptualize its construction. In terms of the final part strength, this infill is abysmal. But on the plus side, the light from the LEDs passing through it emerges with a soft pleasing look that completely obscures the individual points of light.

Anyone with a big enough 3D printer can run off their own copy of his light, as [Nicholas] has released not only his forked version of Slic3r but all of the STL files for the individual components. He’s also put together an exceptionally well documented Thingiverse page that has instructions and detailed build photos, something that’s unfortunately very rare for that platform.

If you’re in the market for a DIY softbox and don’t have a 3D printer handy, fear not. We’ve covered a few that you can build with more traditional methods, as well as several tips and tricks which you can use to get the most out of your photos and videos.

Automated Radiosonde Tracking Via Open Source

February 10, 2019 by 3 Comments

Meteorological organisations across the world launch weather balloons on a regular basis as a part of their work in predicting whether or not it will rain on the weekend. Their payloads are called radiosondes, and these balloons deliver both telemetry and location data throughout their flightpath. Hobbyists around the globe have devoted time and effort to tracking and decoding these signals, and now it’s possible to do it all automatically, thanks to Radiosonde Auto RX.

The basis of the project is the RTL-SDR, everyone’s favourite low-cost software defined radio receiver. In this case, software is used to first hunt for potential radiosonde signals, before then decoding them and uploading the results to a variety of online services. Some of these are designed for simple tracking, while others are designed for live chase and recovery operations. Currently, the software only covers 3 varieties of radiosonde, but the team are eager to expand the project and have requested donations of other radiosondes for research purposes.

The team recently conducted a talk at linux.conf.au regarding the project, which goes into detail as to the decoding and tracking of the radiosonde data. If you’re eager to try it out, download the software, fetch your TV dongle and get cracking. You might also consider tracking cubesats while you’re at it. Video after the break.

via [crazyoperator], thanks to Slds Ernesto for the tip!

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Hidden LED Video Wall At The Oregon Museum Of Science

February 10, 2019 by 10 Comments

Glowing and blinking things are some of our favourite projects around these parts, and the bigger, the better. [Thomas] wrote to us recently to share the design and construction of a large LED wall at the Oregon Museum of Science, and the results are nothing short of impressive.

The concept involved a large LED wall that would be completely hidden when switched off. The team decided to approach this by hiding high-brightness LED panels using APA102 strings behind milky-white plexiglass panels covered with a woodgrain print. The screen has a total of 90,000 pixels, arranged in a 408×220 resolution display.

A lot of bespoke LED displays have some pre-coded patterns, or perhaps some basic reactive features. In this case, FPGA grunt was brought to bear on the problem and the display accepts standard HDMI input. Four Spartan 6 Mojo FPGA boards split up the task of addressing the panels, each receiving the same HDMI signal, but only crunching the pixels relevant to their area of the display. To make sure clean SPI signals get to each panel, special RS485 driver chips are used to send the signal over a differential pair from the FPGA, before breaking the signal back out to standard SPI at the destination.

Building such a large display takes special techniques, and [Thomas] notes that the help of a local construction company was imperative to making the construction of the final video wall look easy. It’s always interesting to see what goes into these large installations. Sometimes, a major build can even clear out world stocks of important components.

Kinematic Mount For 3D Printer Bed Shows Practical Design

February 9, 2019 by 8 Comments
Aluminum bed with new kinematic mount and base on printer Son of Megamax, at the Milwaukee Makerspace

[Mark Rehorst] has been busy designing and building 3D printers, and Son of Megamax — one of his earlier builds — needed a bed heater replacement. He took the opportunity to add a Kelvin-type kinematic mount as well. The kinematic mount and base efficiently constrain the bed in a controlled way while allowing for thermal expansion, providing a stable platform that also allows for removal and repeatable re-positioning.

After a short discussion regarding the heater replacement, [Mark] explains the design and manufacture of his kinematic mount. Of particular note are the practical considerations of the design; [Mark] aimed to use square aluminum tubing as much as possible, with machining requirements that were easily done with the equipment he had available. Time is a resource after all, and design decisions that help one get something working quickly have a value all their own.

If you’re still a bit foggy on kinematic mounts and how they work, you’re not alone. Check out our coverage of this 3D-printed kinematic camera mount which should make the concept a bit clearer.