OpenJewelry, No Pliers Required

July 25, 2022 by Kristina Panos 2 Comments

They say that if you want something done right, you gotta do it yourself. Oftentimes, that goes double for getting something done at all. Whereas some people might simply lament the lack of a (stable) Thingiverse-type site for, say, jewelry designs, those people aren’t Hackaday’s own [Adam Zeloof]. With nowhere to share designs among engineering-oriented friends, [Adam] took the initiative and created OpenJewelry, a site for posting open-source jewelry and wearable art designs as well as knowledge about techniques, materials, and processes.

[Adam] has seeded the site with a handful of his own beautiful designs, which run the gamut from traditional silversmithing techniques to 3D printing to fancy PCBs with working blinkenlights. You really should check it out, and definitely consider contributing.

Even if you don’t have any jewelry designs to share, the code is open as well, or you could even edit the wiki. Just be sure to read through the contribution guidelines first. If you don’t have the time for any of that, donations are welcome as well to help maintain the site.

We love wearable art around here, especially when it serves another purpose like this UV-sensing talisman, or this air quality necklace.

A Tiny Forest Of Resistors Makes For Quick And Dirty Adaptive Optics

July 25, 2022 by Dan Maloney 16 Comments

The term “adaptive optics” sounds like something that should be really complicated and really expensive. And in general, the ability to control the properties of optical elements is sufficiently difficult enough that it’s reserved for big-science stuff like billion-dollar space telescopes.

But that doesn’t mean there aren’t quick and dirty adaptive optics that are suitable for the budget-minded experimenter, like this thermally deformable mirror. As [Zachary Tong] explains, this project, which started quite some time ago, is dead simple — a 4 by 4 array of through-hole resistors stand on end, and these are attached to a glass coverslip that has been aluminized on one side. An Arduino and a couple of shift registers make it possible to individually address each of the 16 resistors in the array. Passing a current through a resistor heats it up a bit, leading to thermal expansion and a slight deflection of the mirror sitting on top of the array. Controlling which resistors heat up and by how much should lead to deformation of the mirror surface in a predictable way.

The video below shows some of [Zach]’s experiments with the setup. Unfortunately, he wasn’t able to fully demonstrate its potential — the low-quality mirror didn’t cooperate with his homebrew interferometer. He was, however, able to use a dial indicator to show deflection of the mirror in the 2- to 3-micron range by heating the array. That alone is pretty cool, especially given the dirt cheap nature of the build.

As for practical uses, don’t get too excited. As [Zach] points out, thermal systems like this will probably never be as fast as MEMS or piezoelectric actuators, and many use cases for adaptive optics really don’t react well to added heat. But changing the shape of a mirror with air pressure is another thing.

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Hack Your Brain: Bionic Reading — Panacea Or Placebo?

July 23, 2022 by Al Williams 17 Comments

In the Star Trek episode Space Seed, [Khan] famously said, “Improve a mechanical device, and you may double productivity. But improve man, you gain a thousandfold.” Most of our hacks center on the mechanical or electromechanical kind, but we do have an interest in safely improving ourselves. The problem is that most of us don’t want to mess with our DNA or have surgery, so it sort of limits our options.

We are always interested in less invasive hacks, so we certainly took note of Bionic Reading. However, a recent paper claims to debunk the claims of benefits. The company promoting the technology claims a Swiss University study showed that while the results were not clear, “the majority had a positive effect.” They also claim, anecdotally, that the technique can help those with dyslexia. What’s the truth? We don’t know, but it is an interesting discussion to follow.

If you haven’t seen it before, Bionic Reading — which, by the way, may not be free to use — is a way of using a dark font to emphasize certain key parts of words. For example, you can read this article using Bionic Reading. [Daniel Doyon] analyzed reading by 2,074 testers and found that participants actually read slower when using the Bionic Reading technique.

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ESP32 Gets A Nifty Serial Console Library

July 22, 2022 by Lewin Day 8 Comments

Sometimes you need to get a project to talk to you, so you can see what’s going on inside. The ESP32 console Arduino library from [jbtronics] promises just that.

The library adds a simple serial console to the ESP32, and is compatible with the Arduino ecosystem to boot. It’s set up to allow the easy addition of custom commands so you can tweak the console to suit your own projects. It’s remarkably complete with nifty features, too. There’s autocomplete as well as a navigable command history – the sorts of features you only expect from a modern OS terminal. A bunch of system commands are built-in, too, for checking the status of things like the memory, network interface, and so on.

The tool is available via the Arduino library manager or the PlatformIO registry. You’ll want to use it with a VT-100 compatible terminal like PuTTY or similar, which lets you use all the fancy features including color output. [jbtronics] hopes to port it to the ESP8266 soon, too!

We’ve seen some other great serial tools of late, too. If you’re brewing up your own nifty console hacks, be sure to drop us a line!

A 3D printed roller coaster model with light strips modelling the trains

How To Make A Model Roller Coaster Without Any Moving Parts

July 20, 2022 by Robin Kearey 5 Comments

Roller coasters are not only great fun to ride, they’re also fascinating pieces of engineering. Building your own full-size coaster is sadly beyond most people’s means, so the average enthusiast will have to settle for simulation or modelling of their own designs. [Jon Mendenhall] is one of those who specialize in building model roller coasters and simulating their motion in intricate detail. His latest project is a scale model of VelociCoaster, a Jurassic Park-themed ride in Universal’s Islands of Adventure, that simulates the coaster’s ride without using any moving parts.

[Jon] achieves this by re-creating the trains’ motion using LED strips. A total of 3000 LEDs are spread along more than nine meters of track and make a mesmerizing light show of several trains whizzing along the track, accelerating and slowing down exactly like the real thing.

In his video, [Jon] explains the process of generating an accurate 3D model of the track starting from nothing more than an overhead view of the park as well as photos taken from various angles. The surrounding terrain and buildings are also included in his 3D model, as are the 128 supports that hold the track in place. The terrain and building were made from plywood and foam using a CNC machine, while the track and supports were 3D printed.

A Teensy microcontroller runs the whole show, with the LED strips split into five separate sections to allow a high enough frame rate for smooth animations. An infrared remote is used to start and stop the ride, as well as to adjust the speed; the model supports running the trains at a physically accurate speed, but because this looks rather dull, the regular setting is about three times as fast.

Looking for more roller coaster models? [Jon] made a similarly impressive model with a powered train before, and we’ve seen several models that actually coast along their tracks.

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Down The Intel Microcode Rabbit Hole

July 19, 2022 by Al Williams 13 Comments

The aptly-named [chip-red-pill] team is offering you a chance to go down the Intel rabbit hole. If you learned how to build CPUs back in the 1970s, you would learn that your instruction decoder would, for example, note a register to register move and then light up one register to write to a common bus and another register to read from the common bus. These days, it isn’t that simple. In addition to compiling to an underlying instruction set, processors rarely encode instructions in hardware anymore. Instead, each instruction has microcode that causes the right things to happen at the right time. But Intel encrypts their microcode. Of course, what can be encrypted can also be decrypted.

Using vulnerabilities, you can activate an undocumented debugging mode called red unlock. This allows a microcode dump and the decryption keys are inside. The team did a paper for OffensiveCon22 on this technique and you can see a video about it, below.

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World’s Biggest Foam RC Plane Takes To The Skies, But Only Barely!

July 18, 2022 by Ryan Flowers 17 Comments

What do you do when you have a whole warehouse sized facility and an industrial sized CNC foam cutter? Clearly, the only choice is to build giant RC aircraft, and that’s exactly what the folks at [FliteTest] teamed up with the illustrious [Peter Sripol] to accomplish. Did it work? Yes. Did it work well? We’ll let you be the judge after taking a gander at the video below the break.

[Peter Sripol], known for building manned ultralight electric aircraft from foam, was roped in as the designer of the aircraft. A very light EPS foam is used to cut out the flying surfaces, while a denser green foam board is sourced from the local home building store to construct the fuselage.

The build is anything but ordinary, and kids are involved in the construction, although the video doesn’t elaborate on it very much. You can see evidence of their excitement in the graffiti on the wings and fuselage- surely a huge success on that front! As for flying? Four large motors provide locomotion, and it’s barely enough to keep the beast flying. A mishap with the Center of Gravity demands a last minute design change which renders the rudder almost useless. But, it does fly, and it is a great step toward the next iteration. Just like every good hack!

If you want to see a manned foam electric aircraft, check out [Peter Sripol]’s DIY Electric Ultralight MK4.

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