2026-04-20 01:00:52
Sometimes, as hackers and makers, we can end up with messy lashed-together gear that is neither reliable nor tidy. Rackmounting your stuff can be a great way to improve the robustness and liveability of your setup. If you find this appealing, you might like CageMaker by [WebMaka].
This parametric OpenSCAD script can generate mounts for all kinds of stuff. Maybe you have a little network switch that’s just a tangle of wires on your desk, or a few pieces of audio gear that are loosely stacked on top of each other and looking rather unkempt. It would be trivial with this tool to create some 3D printed adapters to get all that stuff laced up nice and neat in a rack instead.
If you’re eager to get tinkering, you can try out the browser-based version quite easily. We’ve featured similar work before, too—many a maker has trod the path of rackmounting, as it turns out.
2026-04-19 22:00:36
Rim-driven thrusters turn the normal propeller-motor arrangement inside out; rather than mounting the motor at the center of the propeller, they use a large hollow motor, with the blades attached to the inside of the rotor. They’re mostly used in ship propellers, though there have been some suggestions to use them in electric aircraft. [Integza], always looking for new and unusual ways to create propulsion, took this idea and made it into a jet engine.
Rather than using an electric motor, the fan in this design is propelled by miniature rocket nozzles along the edge. The fan levitates on a layer of high-pressure gas between the fan rim and the housing. To prevent too much pressurized gas from escaping, the fan and housing needed to fit together closely, but with minimal friction. A prototype made out of acrylic and resin and powered by compressed air proved that the idea worked, but [Integza] wanted to make to this a combustion-powered engine.
The full engine would be similar to a rocket engine, with the fan being the nozzle. The combustion chamber was built out of a brass fitting, and it burned propane in compressed air. The fan and housing were CNC-milled out of aluminium and brass, respectively. They worked well when powered with compressed air, but seized up when connected to the combustion chamber — the fan was thermally expanding and jamming in the housing. Progressively rounding down the edges of the fan failed to solve this, and a hole melted in the fan during one test. [Integza] machined a new fan, which he anodized to increase its heat resistance.
To keep it from overheating, he sprayed water into the combustion chamber, creating steam and cooling the exhaust stream to a manageable temperature. The engine did work, though we do wonder whether the fan actually increases its thrust over that of the base rocket engine.
This isn’t the first unconventional jet engine [Integza]’s built, nor the first which tries to amplify the thrust produced by a rocket engine.
Thanks to [Keith Olson] for the tip!
2026-04-19 19:00:22
If you put a bunch of computers in charge of your house, it’s generally desirable to ensure their up-time is as close to 100% as possible. An uninterruptible power supply can help in this regard. To that end, that’s why [Bill Collis] whipped one up for his Home Assistant setup.
[Bill]’s UPS is charged with one job—keeping the Home Assistant Green hub and an Xfinity XB7 cable modem online when the grid goes dark. The construction is relatively straightforward. When the grid is up, everything is powered via a Mean Well AC-DC 12 V power supply, while the power is also used to charge a 12.8 V 10 Ah lithium iron phosphate battery pack. When the grid goes out, the system switches over to running the attached hardware on pure battery power. A Victron BatteryProtect is used to automatically disconnect the load if the battery voltage drops too low. Meanwhile, a Shelly Plus Uni module is used to monitor battery voltage and system status, integrated right into Home Assistant itself.
If you want to keep the basics of your smart home going at all times, something like this is a pretty simple way to go. We’ve featured some other great UPS builds in the past, too. If you’re whipping up your own hardware to keep your home or lab alive in the dark of night, don’t hesitate to notify the tipsline.
2026-04-19 16:00:23
Betteridge’s law applies, but with help and guidance by a human who knows his stuff, [Ready Z80] was able to get a functioning game of Wordle out of the French-named LLM, which is more than we expected. It’s not like the folks at Anthropic spent much time making sure 40-year-old opcodes were well represented in their training data, after all.
For hardware, [Ready Z80] is working with the TEC-1G single-board-computer, which is a retrocomputer inspired by the TEC-1 whose design was published by Australian hobbyist magazine “Talking Electronics” back in the 1980s. Claude actually seemed to know what that was, and that it only had a hex keypad — though when [Ready Z80] was quick to correct it and let the LLM know he’s using a QWERTY keyboard add-on, Claude declared it was confident in its ability to write the code.
As usual for a LLM, Claude was overconfident and tossed out some nonexistent instructions. Though admittedly, it didn’t persist in that after being corrected. It’s notable that [Ready Z80] doesn’t prompt it with “Give me an implementation of Wordle in Z80 assembly for the TEC-1G” but goes through step-by-step, explaining exactly what he wants each section of the code to do. As [Dan Maloney] reported three years ago, it’s a bit like working with a summer intern.
In the end, they get a working game, but that was never in question. [Ready Z80] reveals over the course of the video he has the chops to have written it himself. Did using Claude make that go faster? Based on studies we’ve seen, it probably felt like it, even if it may have actually slowed him down.
2026-04-19 13:00:18
Capacitive displacement sensors span a wide range of resolution, from the touchscreen sensors which can only detect displacement as a binary state, all the way to the sensors in semiconductor fabs which measure down to nanometers. The sensor [Matthias Wandel] built with a Raspberry Pi Pico lands somewhere in the middle, providing both sensitive measurements and an absolute scale.
The idea is that the amount of overlap between two metal plates should be detectable by measuring the capacitance between them. Reaching any kind of usable resolution would require a very precise measure of capacitance, around the picofarad range. [Matthias] realized that the Pico’s GPIO pins have an inherent capacitance, and can have a pull-down resistor set, essentially creating an RC circuit. [Matthias] would set a pin to a high-level output, then switch it to an input. The amount of time the pin takes to switch from high to low indicates the RC constant, which includes the capacitance attached to the pin.
When attached to a metal plate, the Pico was sensitive enough to detect the plate’s capacitive coupling to [Matthias]’s hand through a thick wooden floor. To measure capacitance between two metal plates, the Pico measured how well a voltage signal applied to one plate was coupled to the other plate. This was sensitive enough to measure the slight change in the dielectric constant when [Matthias] waved a piece of ABS pipe between the two capacitor plates. Making actual position measurements was tricky, since capacitance changed with both X- and Z-axis shifts in the plates.
Digital calipers use similar capacitive sensors to make their measurements, as [Matthias] knows from his experiments in hacking them. If you’re interested in more details, check out this teardown of some cheap digital calipers.
Thanks to [H Hack] for the tip!
2026-04-19 10:00:09
The Unity game development platform was first released in 2005, long after the PlayStation had ceased to be a relevant part of the console market. And yet, you could use Unity to develop for the platform, if you so desire, thanks to the efforts of [Bandwidth] and the team behind psxsplash.
Yes, it really is possible to design games for the original PlayStation using Unity and Lua. Using a tool called SplashEdit, you can whip up scenes, handle scripting, loading screens, create UIs, and do all the other little bits required to lash a game together. You can then run your creation via the psxsplash engine, deploying to emulator or even real hardware with a single click. Currently, development requires a Windows or Linux machine and Unity 6000.0+, but other than that, it’s pretty straightforward to start making games with a modern toolset for one of the most popular consoles of all time. Just remember, you’ve only got 33 MHz and 2MB of RAM to play with.
We still love to see the legendary grey machine get used and hacked in new and inventive ways, so many decades after release.
Thanks to [Nick] for the tip!
