Building A Tiny Table Saw

May 22, 2025 by 29 Comments

If you want a regular table saw, you’re probably best off just buying one—it’s hard to beat the economies of scale that benefit the major manufacturers. If you want a teeny one, though, you might like to build it yourself. [Maciej Nowak] has done just that.

The concept is simple enough; a small motor and a small blade make a small table saw. [Maciej] sourced a remarkably powerful 800-watt brushless motor for the build. From there, the project involved fabricating a suitable blade mount, belt drive, and frame for the tool. Some time was well-spent on the lathe producing the requisite components out of steel and aluminum, as well as a stout housing out of plywood. The motor was then fitted with a speed controller, with the slight inconvenience that it’s a hobby unit designed to run off DC batteries rather than a wall supply. Ultimately, though, this makes the saw nicely portable. All that was left to do was to fit the metal top plate, guides, and a suitably small 3″ saw blade to complete the build.

We’ve seen mini machine tools like these before, too. They can actually be pretty useful if you find yourself regularly working on tiny little projects. Video after the break.

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2025 Pet Hacks Contest: Loko Tracks Fido With LoRa And GPS

May 22, 2025 by 7 Comments

Some projects start as hacks, and end as products — that’s the case for [Akio Sato]’s project Loko, the LoRa/GPS tracker that was entered in our 2025 Pet Hacks Contest. The project dates all the way back to 2019 on Hackaday.io, and through its logs you can see its evolution up to the announcement that Loko is available from SeeedStudio.

It’s not a device necessarily limited to pets. In fact, the original use case appears to have been a backup locator beacon for lost drones. But it’s still a good fit for the contest none-the-less: at 12 grams, the tiny tracking device won’t bother even the most diminutive of pups, and will fit on any collar at only 30 mm x 23 mm. The “ground station” that pairs with your phone is a bit bigger, of course, but unless you have a Newfoundlander or a St. Bernard you’re likely bigger than fido. The devices use LoRa to provide a range up to 15 km — maybe better if you can loop them into a LoRaWAN. Depending on how often you pin the tracker, it can apparently last for as long as 270 days, which we really hope you won’t need to track a missing pet.

The hardware is based around Seeed’s Wio-E5 LoRa chip, which packages an STM32 with a LoRA radio. The firmware is written in MicroPython, and everything is available via GitHub under the MIT license. Though the code for the mobile app that interfaces with that hardware doesn’t appear to be in the repository at the moment. (There are folders, but they’re disappointingly empty.) The apps are available free on the iOS App Store and Google Play, however.

There’s still plenty of time to submit your own hacks to the Pet Hacks Contest, so please do! You have until May 10th, so if you haven’t started yet, it’s not too late to get hacking.

2025 Hackaday Pet Hacks Contest

Hackaday Supercon 2025 Call For Participation: We Want You!

May 22, 2025 by 12 Comments

We’re tremendously excited to be able to announce that the Hackaday Supercon is on for 2025, and will be taking place October 31st through November 2nd in Pasadena, California.

Supercon is about bringing the Hackaday community together to share our great ideas, big and small. So get to brainstorming, because we’d like to hear what you’ve been up to! Like last year, we’ll be featuring both longer and shorter talks, and hope to get a great mix of both first-time presenters and Hackaday luminaries. If you know someone you think should give a talk, point them here.

The Call for Participation form is online now, and you’ve got until July 3rd 10th to get yourself signed up.

Honestly, just the people that Supercon brings together is reason enough to attend, but then you throw in the talks, the badge-hacking, the food, and the miscellaneous shenanigans … it’s an event you really don’t want to miss. And as always, presenters get in for free, get their moment in the sun, and get warm vibes from the Hackaday audience. Get yourself signed up now!

We’ll have more news forthcoming in the next few weeks, including the start of ticket sales, so be sure to keep your eyes on Hackaday.

Now KDE Users Will Get Easy Virtual Machine Management, Too

May 22, 2025 by 27 Comments

If you work with virtual machines, perhaps to spin up a clean OS install for testing, historically you have either bitten the bullet and used one of the commercial options, or spent time getting your hands dirty with something open source. Over recent years that has changed, with the arrival of open source graphical applications for effortless VM usage. We’ve used GNOME Boxes here to make our lives a lot easier.  Now KDE are also joining the party with Karton, a project which will deliver what looks very similar to Boxes in the KDE desktop.

The news comes in a post from Derek Lin, and shows us what work has already been done as well as a roadmap for future work. At the moment it’s in no way production ready and it only works with QEMU, but it can generate new VMs, run them, and capture their screens to a desktop window. Having no wish to join in any Linux desktop holy wars we look forward to seeing this piece of software progress, as it’s a Google Summer Of Code project we hope there will be plenty more to see shortly.

Still using the commercial option? You can move to open source too!

A Brief History Of Fuel Cells

May 22, 2025 by 13 Comments

If we asked you to think of a device that converts a chemical reaction into electricity, you’d probably say we were thinking of a battery. That’s true, but there is another device that does this that is both very similar and very different from a battery: the fuel cell.

In a very simple way, you can think of a fuel cell as a battery that consumes the chemicals it uses and allows you to replace those chemicals so that, as long as you have fuel, you can have electricity. However, the truth is a little more complicated than that. Batteries are energy storage devices. They run out when the energy stored in the chemicals runs out. In fact, many batteries can take electricity and reverse the chemical reaction, in effect recharging them. Fuel cells react chemicals to produce electricity. No fuel, no electricity.

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Trashed Sound System Lives To Rock Another Day

May 22, 2025 by 6 Comments

Plenty of consumer goods, from passenger vehicles to toys to electronics, get tossed out prematurely for all kinds of reasons. Repairable damage, market trends, planned obsolescence, and bad design can all lead to an early sunset on something that might still have some useful life in it. This was certainly the case for a sound system that [Bill] found — despite a set of good speakers, the poor design of the hardware combined with some damage was enough for the owner to toss it. But [Bill] took up the challenge to get it back in working order again.

Inside the DIY control unit.

The main problem with this unit is that of design. It relies on a remote control to turn it on and operate everything, and if that breaks or is lost, the entire unit won’t even power on. Tracing the remote back to the control board reveals a 15-pin connector, and some other audio sleuths online have a few ways of using this port to control the system without the remote.

[Bill] found a few mistakes that needed to be corrected, and was eventually able to get an ESP8266 (and eventually an ESP32) to control the unit thanks largely to the fact that it communicates using a slightly modified I2C protocol.

There were a few pieces of physical damage to correct, too. First, the AC power cable had been cut off which was simple enough to replace, but [Bill] also found that a power connector inside the unit was loose as well. With that taken care of he has a perfectly functional and remarkably inexpensive sound system ready for movies or music. There are some other options available for getting a set of speakers blasting tunes again as well, like building the amplifier for them from scratch from the get-go.

Wire-frame image of gearbox, setup as a differential

Roller Gearbox Allows For New Angles In Robotics

May 22, 2025 by 18 Comments

DIY mechatronics always has some unique challenges when relying on simple tools. 3D printing enables some great abilities but high precision gearboxes are still a difficult problem for many. Answering this problem, [Sergei Mishin] has developed a very interesting gearbox solution based on a research paper looking into simple rollers instead of traditional gears. The unique attributes of the design come from the ability to have a compact angled gearbox similar to a bevel gearbox.

Multiple rollers rest on a simple shaft allowing each roller to have independent rotation. This is important because having a circular crown gear for angled transmission creates different rotation speeds. In [Sergei]’s testing, he found that his example gearbox could withstand 9 Nm with the actual adapter breaking before the gearbox showing decent strength.

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