Addressable LEDs Make Giant 16×2 Character Display

August 5, 2026 by Tyler August 11 Comments

We’ve always taken a certain childlike joy in seeing tiny things made big, and big things tiny. Evidently [Uncle Stem] is the same way, if this 7x sized 16×2 “LCD” display is any indicator.

“LCD” is in scare quotes there, because while the original display is a character LCD, [Uncle Stem]’s embigginated recreation is not. Liquid crystal displays are beyond all but the most dedicated DIYers, so [Stem] recreated the whole thing with addressable LEDs instead — over a thousand of them. Each character got its own PCB, and rather than pay for assembly [Stem] used a 3D printed stencil to help apply solder paste, an idea we’ve seen before. His choice of long lengths of nickel strip — the stuff you spot weld to Li-ion batteries — to join the LED-holding PCBs is also worth noting.

In order to get his giant display to act like the I2C-operated module he loves, [Uncle Stem] equipped it with an RP2040 pre-programmed with the LCD character set. That way he can plug it into any Arduino project that uses the LiquidCrystal_I2C library and have the authentic 1602 experience. The green “PCB” the display is mounted to is actually laser-cut plywood, while some acrylic sits in front of his PCBs with office paper to act as as a diffuser. A 3D printed frame completes the illusion. He even goes so far as to replicate the pin headers at 7:1 scaling with brass rods.

He also connects it to a over-sized Arduino, with giant jumper wires. But for the record, not the giant Arduino we featured previously. Like we said, hackers like to mess with scale, and we’ve seen everything from giant benchies to a working Mac Classic for Barbie.

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Could Camera Hardware Be The Physical Equivalent To USB-C?

August 5, 2026 by Tyler August 40 Comments

[Mansour] presents an interesting idea in his essay A Common Thread — just as USB-C has become the “One Connector To Rule Them All” in the world of electronics, so too should his projects have a unified physical connection layer. A common thread, if you will.

Specifically, the 1/4″-20 UNC connector that was already on all his camera equipment. Unifying his stuff around that connector wasn’t a bolt from the blue brainwave. By the sounds of it, the idea evolved over time and only became intentional after he’d already started using it.

There’s something to be said for it, though. One thing is the convenience of knowing your various bits and bobs are going to fit together like they were made with LEGO. Another is taking away a whole set of decisions in the design process: it’s going to have a 1/4″-20 UNC fitting, so [Mansour] needs only decide if its going to be tapped into the material or if he’s using an inset or captive bolt.

It isn’t like a 1/4″ bolt is going to introduce a weak point in most things we build — with good hardware it can take a ton or more. On the other hand it’s not exactly resilient to torque, but [Mansour]’s camera bag had the answer to that, too: spring loaded locator pins that drop into holes on the female side to take up the torque. In the photography world, these are ARRI pins. To us they just seem like a good idea.

Maybe you don’t see the point of avoiding redesigning the wheel every time for custom mounts and brackets. After all, that lets you come up the the ideal solution every time. On the other hand, [Mansour] has both simplified his design process and made decades worth of camera-holding objects — everything from tripods to stabilizing gimbals — accessible to all his stuff. It’s an interesting idea, and his full blog post is worth a read, even if it’s not likely the EU is going to force its adoption like it did USB-C.

A Full Motion Video Codec For The Atari ST

August 4, 2026 by Tyler August 6 Comments

Who says an old dog can’t do new tricks? The Atari ST has got to qualify as an “old dog” 41 years after launch, and if playing Full Motion Video (FMV) cutscenes– from DOS games of a decade later– doesn’t count as a new trick, we’re not sure what does. In this case, [Jonas Eschenburg] is the trainer and his fascinating write-up lets you know exactly how he did it.

Unlike the contemporary and pricier Amiga, Atari’s 68000-based home computer didn’t have any fancy graphics chips; everything has to go through the Motorolla CPU at a blistering 8MHz. Just porting classic DOS games like [Jonas Eschenburg] is doing with Command and Conquer— a title 10 years newer than the ST– is an amazing tour de force. Bringing the cutscenes along for the ride is just bonus, but what a bonus it is.

Granted, [Jonas] has to work within the Atari’s limitations, so it doesn’t quite look the same. The biggest limitation is of course the 16 colour planar graphics on the Atari, compared with 256 colours of chunky goodness that VGA offered. [Jonas] admits that getting good palettes to minimize artifacting is a challenge. Interestingly he’s not showing quite so many blocking artifacts we would expect from the technique he is using: to take advantage of how the ST’s memory is laid out, he’s using a codebook-based codec that splits the image into easily-addressable blocks. Both the palette and the codebook must update continuously as the film plays but that’s still easier on the antique hardware than streaming raw pixel data, which you cannot do. The whole article is absolutely worth a read, and the demo videos generously sprinkled through it are worth a look, too. We’ve included a demo of C&C‘s intro below. If you’re itching to play, the port is on Itch.io.

Speaking of DOS games, did you know the Atari ST can run doom? Multiple versions, even.

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Yellow YAG Produces Powerful Pulses In Les’ Leftover Laser

August 4, 2026 by Tyler August 7 Comments

[Les] likes lasing lasers, and who doesn’t? [Les] likes larger lasers than lots of folks, with his current project being an Nd:YAG (that’s Neodymium:Yttrium Aluminum Garnet) flash pumped laser intended for tattoo removal. Like most of its ilk, the YAG crystal at the heart of that device is a rosy purple color, so when [Les] spotted a Yellow YAG with different doping promising powerful pulses, he purchased it promptly.

Specifically, the retailer was claiming a 30-50% efficiency increase for this yellow rod, thanks to cerium doping. It’s still considered an Nd:YAG, though you can label it as an Nd:Ce:YAG for clarity. The efficiency gain comes from the cerium atom taking unused energy from the flashbulb pulse — which is much broader-wavelength than the thin absorption line of the Nd ions in the rod — and giving that energy to the Nd atoms that do the lasing via fluorescence. He doesn’t try it, but reports on a paper showing these crystals can actually lase with reasonable efficiency from sunlight alone, which we’d love to see. Send us a tip if you try.

His original Nd:YAG rod produced 72.8 mJ pulses, while in the same setup with the yellow laser is peaking at 153 mJ, more than double the original output. That’s even better than the 30-50% [Les] expected, but he reckons it is because the old YAG is, well, old. The coatings break down over time, and UV light from the flashbulbs degrades the crystals too. That’s another benefit of tossing cerium in there, as apparently it acts as sunscreen for your laser rod. It lasts longer and works better, making it a no-brainer of an upgrade.

We’ve seen [Les]’s laser-based hacking before, like this diode-laser PSU and we’re always glad to take a look with our remaining eye. We also featured his tattoo removal laser back when he started working on it, along with less-lasery projects like his crystal-growing rig.

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New File Manager Is C64’s Answer To Norton Commander

August 3, 2026 by Tyler August 17 Comments

Norton was always a PC company — Norton Commander, the file manager that launched a thousand clones, was only ever available for DOS, like the rest of the company’s offerings in those days. If they’d decided to port it to the C64, though, it would likely look a lot like [retro3872809] aka [Chicken 64]’s Multi Floppy Commander with Turbo, available on GitLab.

As you might be able to see on the screen shot above or in the demo video below, the application provides an 80-column interface with a split view to show a pair of floppies side-by-side. Not that you’re limited to two floppies, however. The software is happy to swap between all the drives on the bus, to the C64’s maximum of four. All four drives will be usable since the file manager lives on a cartridge.

All drive models are supported, though not all have turbo. As a file manager, it looks like it has the normal functionality you’d expect: renaming, copying, moving and deleting files and directories. You can also launch programs or print disk listings, assuming you have a printer attached to your Commodore.

Said Commodore perhaps needn’t be vintage, as they’re selling new ones again, but if you want a disk drive you may have to fix it yourself.

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UV Printer? 3D Printer? HeyGears Says “Why Not Both”?

August 1, 2026 by Tyler August 14 Comments

There’s a new contender in the prosumer UV printer world up on Kickstarter, the HeyGears G1. This one’s particularly interesting as they’re explicitly marketing it as being able to produce full-color 3D prints along with the “print-on-anything” functionality we’ve come to expect from a UV flatbed printer.

You get two choices of bed, with the larger being 420 mm x 320 mm x 130 mm. Hardly the largest build volume we’ve seen around here. You can fill that with up to 6 KG of UV ink/resin from its Epson-brand head in glorious full color and layers as small as 10 um. The ink isn’t super cheap — the CMYK kit looks to MRSP at 189 USD — but you aren’t locked in to expensive cartridges at least. HayGears sells ink in bottles, and you’re free to grab any other brand’s bottles if you want to risk it.

The Kickstarter is ongoing, and it will be some time before backers get their printers. But we can report that the early review copies, like the one [Steve Makes Everything] got for the video embedded below, seem to live up to the manufacturer’s claims, which is promising indeed. Certainly the idea of SLA quality without the mess is very appealing to many — though the super-early-bird price of two grand on Kickstarter and the doubtless higher MRSP may temper some of that interest.

If you’re curious about this UV printer business and why a maker might want one that doesn’t do 3D, our own [Tom Nardi] went hands-on with the EufyMake E1 last year.

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Stewart Platform Walker Gains Feeling In Legs From Resistors

August 1, 2026 by Tyler August 3 Comments

Stewy is a very interesting robot, with some slightly odd kinematics. Its head is a Stewart platform, which is a common-enough 6-DOF actuated plate normally used with a fixed base. By connecting legs to the same servos running the Stewart platform, [JD] turned it into an adorable hexapod walker. The walker had a problem, though: it can’t feel its feet, and [JD] thinks that would make it much more mobile on uneven surfaces. So he got some resistors to turn the cheap servos in its legs into force-sensing actuators.

Well, almost. He’s not actually putting strain gauges or anything like that into the legs; he’s just measuring the voltage drop across a resistor in series with the servos. Since the motors draw more current the more torque they’re putting out, he has a very quick and easy way to sense the current and thus the torque using good old Ohm’s law and an analog input on the microcontroller driving the robot. It’s a simple hack, but the data he’s getting is surprisingly good for how much work it is to add to a robot, as you can see in the video — at least once he slowed down the servos a touch.

Perhaps this isn’t a ground-breaking innovation, but [JD] does a very good idea explaining it. Of course if you want to use resistors to sense force directly, force-sensitive resistors are a thing that we’ve seen in everything from Twister-mat MIDI controllers to self-leveling 3D printers.

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