Water On Mars? Maybe Not

November 24, 2025 by 3 Comments

We were as excited as anyone when MARSIS (the Mars Advanced Radar for Subsurface and Ionosphere Sounding) experiment announced there was possibly liquid water under the southern polar ice cap. If there is liquid water on Mars, it would make future exploration and colonization much more feasible. Unfortunately, SHARAD (the Shallow Radar) has a new trick that suggests the data may not indicate liquid water after all.

While the news is a bummer, the way scientists used SHARAD to confirm — or, in this case, deny — the water hypothesis was a worthy hack. The SHARAD antenna is on the Mars Reconnaissance Orbiter, but in a position that makes it difficult to obtain direct surface readings from Mars. To compensate, operators typically roll the spacecraft to give the omnidirectional antenna a clearer view of the ground. However, those rolls have been under 30 degrees.

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Heated Seat controls

Retrofits Done Right: Physical Controls For Heated Seats

November 24, 2025 by 5 Comments

We’ve all owned something where one tiny detail drives us nuts: a blinding power LED, buttons in the wrong order, or a beep that could wake the dead. This beautifully documented project fixes exactly that kind of annoyance, only this time it’s the climate-controlled seats in a 2020 Ram 1500.

[projectsinmotion] wasn’t satisfied with adjusting seat heating and ventilation only through the truck’s touchscreen. Instead, they added real physical buttons that feel just like factory equipment. The challenge? Modern vehicles control seats through the Body Control Module (BCM) over a mix of CAN and LIN buses. To pull this off, they used an ESP32-S3 board with both CAN and LIN transceivers that sits in the middle and translates button presses into the exact messages the BCM expects.

The ESP32 also listens to the CAN bus so the new physical buttons always match whatever setting was last chosen on the touchscreen, no mismatched states, no surprises. On the mechanical side, there are 3D-printed button bezels that snap into blank switch plates that come out looking completely stock, plus a tidy enclosure for the ESP32 board itself. Wiring is fully reversible: custom adapters plug straight into the factory harness. Every pinout, every connector, and every wire color is documented with WireVis diagrams we’ve covered before, making this an easily repeatable seat-hack should you have a similar vehicle. Big thanks to [Tim] for the tip! Be sure to check out some of our other car hacks turning a mass produced item into one of a kind.

Ultrasonic Cutting On The Cheap

November 24, 2025 by 10 Comments

When you think of ultrasonics,  you probably think of a cleaner or maybe a toothbrush. If you are a Star Trek fan, maybe you think of knocking out crew members or showers. But there is another practical use of ultrasonics: cutting. By vibrating a blade at 40 kHz or so, you can get clean, precise cuts in a variety of materials. The problem? Commercial units are quite expensive. So [Electronoobs] decided to roll his own. Check it out in the video below.

There are dreams and then there’s reality. Originally, the plan was for a handheld unit, but this turned out not to be very practical. Coil actuators were too slow. Piezo elements made more sense, but to move the blade significantly, you need a larger element.

Taking apart an ultrasonic cleaner revealed a very large element, but mounting it to a small blade would be a problem. The next stop was an ultrasonic toothbrush. Inside was a dual piezo element with an interesting trick. The elements were mounted in a horn that acts like an ultrasonic megaphone, if you will.

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Testing The Survivability Of Moss In Space

November 24, 2025 by 7 Comments

The cool part about science is that you can ask questions like what happens if you stick some moss spores on the outside of the International Space Station, and then get funding for answering said question. This was roughly the scope of the experiment that [Chang-hyun Maeng] and colleagues ran back in 2022, with their findings reported in iScience.

Used as moss specimen was Physcomitrium patens, a very common model organism. After previously finding during Earth-based experiments that the spores are the most resilient, these were subsequently transported to the ISS where they found themselves placed in the exposure unit of the Kibo module. Three different exposure scenarios were attempted for the spores, with all exposed to space, but one set kept in the dark, another protected from UV and a third set exposed to the healthy goodness of the all-natural UV that space in LEO has to offer.

After the nine month exposure period, the spores were transported back to Earth, where the spores were allowed to develop into mature P. patens moss. Here it was found that only the spores which had been exposed to significant UV radiation – including UV-C unfiltered by the Earth’s atmosphere – saw a significant reduction in viability. Yet even after nine months of basking in UV-C, these still had a germination rate of 86%, which provides fascinating follow-up questions regarding their survivability mechanisms when exposed to UV-C as well as a deep vacuum, freezing temperatures and so on.

Illustrated Kristina with an IBM Model M keyboard floating between her hands.

Keebin’ With Kristina: The One With The Elegant Macro Pad

November 24, 2025 by 2 Comments

Some people are not merely satisfied with functionality, or even just good looks. These persnickety snoots (I am one of them) seek something elegant, a true marriage of form and function.

Image by [YANG SHU] via Hackaday.IO
Should such a person be in the market for a macro pad (or ‘macropad’ if you prefer), that snoot should look no further than [YANG SHU]’s 8-key programmable stream deck-like device.

The main goal here was the perfect fusion of display and feel. I’m not sure that an FDM-printed, DIY macro pad can look any better than this one does. But looks are only half the story, of course. There’s also feel, and of course, functionality.

Yes those are (hot-swappable) mechanical key switches, and they are powered by an ESP32-S2. Drawn on the 3.5″ LCD are icons and text for each switch, which of course can be easily changed in the config app.

There’s a three-direction tact switch that’s used to switch between layout profiles, and I’m sure that even this is satisfying on the feel front. Does it get better than this? Besides maybe printing it in black. I ask Hackaday.

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Build Yourself A Medium-Format Camera

November 24, 2025 by 1 Comment

Medium format cameras have always been a step up from those built in the 35 mm format. By virtue of using a much larger film, they offer improved resolution and performance. If you want a medium format film camera, you can always hunt for some nice vintage gear. Or, you could build one from scratch — like the MRF2 from [IDENTIDEM.design.]

The MRF2 might be a film camera, but in every other way, it’s a thoroughly modern machine. It’s a rangefinder design, relying on a DTS6012M LIDAR time-of-flight sensor to help ensure your shots are always in sharp focus. An ESP32 is responsible for running the show, and it’s hooked up to OLED displays in the viewfinder and on the body to show status info. The lens is coupled with a linear position sensor for capturing accurate shots, there’s a horizon indicator in the viewfinder, and there’s also a nice little frame counter using a rotary encoder to track the film.

Shots from a prototype on Instagram show that this camera can certainly pull off some beautiful shots. We love a good camera build around these parts. You can even make one out of a mouse if you’re so inclined.

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The Unexpected Joys Of Hacking An Old Kindle

November 24, 2025 by 8 Comments

In the closing hours of JawnCon 0x2, I was making a final pass of the “Free Stuff for Nerds” table when I noticed a forlorn Kindle that had a piece of paper taped to it. The hand-written note explained that the device was in shambles — not only was its e-ink display visibly broken, but the reader was stuck in some kind of endless boot loop. I might have left it there if it wasn’t for the closing remark: “Have Fun!”

Truth is, the last thing I needed was another Kindle. My family has already managed to build up a collection of the things. But taking a broken one apart and attempting to figure out what was wrong with it did seem like it would be kind of fun, as I’d never really had the opportunity to dig into one before. So I brought it home and promptly forgot about it as Supercon was only a few weeks away and there was plenty to keep me occupied.

The following isn’t really a story about fixing a Kindle, although it might seem like it on the surface. It’s more about the experience of working on the device, and the incredible hacking potential of these unassuming gadgets. Whether you’ve got a clear goal in mind, or just want to get your hands dirty in the world of hardware hacking, you could do far worse than picking a couple of busted Kindles up for cheap on eBay.

If there’s a singular takeaway, it’s that the world’s most popular e-reader just so happens to double as a cheap and impressively capable embedded Linux development environment for anyone who’s willing to crack open the case.

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