Robot Balances Ball On A Plate

September 22, 2025 by 26 Comments

Imagine trying to balance a heavy metal ball bearing on a cafeteria tray. It’s not the easiest thing in the world! In fact, it’s perhaps a task better automated, as [skulkami3000] demonstrates with this robotic build.

The heart of the build is a flat platform fitted with a resistive touchscreen panel on top. The panel is hooked up to a Teensy 4.0 microcontroller. When a heavy ball bearing is placed on the touch panel, the Teensy is thus able to accurately read its position. It then controls a pair of NEMA 17 stepper motors via TCM2208 drivers in order to tilt the panel in two axes in order to keep the ball in the centre of the panel. Thanks to its quick reactions and accurate sensing, it does a fine job of keeping the ball centred, even when the system is perturbed.

Projects like these are a great way to learn the basics of PID control. Understanding these concepts will serve you well in all sorts of engineering contexts, from controlling industrial processes to building capable quadcopter aircraft. Continue reading “Robot Balances Ball On A Plate” →

Jenny’s Daily Drivers: KDE Linux

September 22, 2025 by 43 Comments

Over this series test-driving operating systems, we’ve tried to bring you the unusual, the esoteric, or the less mainstream among the world of the desktop OS. It would become very boring very quickly of we simply loaded up a succession of Linux distros, so we’ve avoided simply testing the latest Debian, or Fedora.

That’s not to say that there’s no space for a Linux distro on these pages if it is merited though, as for example we marked its 30th anniversary with a look at Slackware. If a distro has something interesting to offer it’s definitely worth a look, which brings us to today’s subject.

KDE Linux is an eponymous distro produced by the makers of the KDE Plasma desktop environment and associated applications, and it serves as a technical demo of what KDE can be, a reference KDE-based distribution, and an entirely new desktop Linux distribution all in one. As such, it always has the latest in all things KDE, but aside from that perhaps what makes it even more interesting is that as an entirely new distribution it has a much more modern structure than many of the ones we’re used to that have their roots in decades past. Where in a traditional distro the system is built from the ground up on install, KDE Linux is an immutable base distribution, in which successive versions are supplied as prebuilt images  on which the user space is overlaid. This makes it very much worth a look. Continue reading “Jenny’s Daily Drivers: KDE Linux” →

This Device Is A Real Page Turner

September 22, 2025 by 6 Comments

You can read e-books on just about anything—your tablet, your smartphone, or even your PC. However, the interface can be lacking somewhat compared to a traditional book—on a computer, you have to use the keyboard or mouse to flip the pages. Alternatively, you could do what [NovemberKou] did, and build a dedicated page-turning device.

The device was specifically designed for use with the Kindle for Mac or Kindle for PC reader apps, allowing the user to peruse their chosen literature without using the keyboard to change pages. It consists of a thumb wheel, rotary encoder, and an Arduino Pro Micro mounted in a 3D printed shell. The Pro Micro is set up to emulate a USB keyboard, sending “Page Up” or “Page Down” key presses as you turn the thum bwheel in either direction.

Is it a frivolous device with a very specific purpose? Yes, and that’s why we love it. There’s something charming about building a bespoke interface device just to increase your reading pleasure, and we wholeheartedly support it.

Continue reading “This Device Is A Real Page Turner” →

Meta’s Ray-Ban Display Glasses And The New Glassholes

September 22, 2025 by 133 Comments

It’s becoming somewhat of a running gag that any device or object will be made ‘smart’ these days, whether it’s a phone, TV, refrigerator, home thermostat, headphones or glasses. This generally means somehow cramming a computer, display, camera and other components into the unsuspecting device, with the overarching goal of somehow making it more useful to the user and not impacting its basic functionality.

Although smart phones and smart TVs have been readily embraced, smart glasses have always been a bit of a tough sell. Part of the problem here is of course that most people do not generally wear glasses, between people whose vision does not require correction and those who wear e.g. contact lenses. This means that the market for smart glasses isn’t immediately obvious. Does it target people who wear glasses anyway, people who wear sunglasses a lot, or will this basically move a smart phone’s functionality to your face?

Smart glasses also raise many privacy concerns, as their cameras and microphones may be recording at any given time, which can be unnerving to people. When Google launched their Google Glass smart glasses, this led to the coining of the term ‘glasshole‘ for people who refuse to follow perceived proper smart glasses etiquette.

Continue reading “Meta’s Ray-Ban Display Glasses And The New Glassholes” →

IPhone Air Still Apparently Repairable Despite Its Compact Construction

September 22, 2025 by 13 Comments

Miniaturization is a trend that comes and goes in the cellular phone space. For a while, our phones were all getting smaller, then they started getting bigger again as screens expanded to show us ever more content and advertising. The iPhone air is going back the other way, with a design that aims to sell based on its slimness. [iFixit] reckons that despite its diminutive dimensions, it should still be quite repairable.

“Thinner usually means flimsier, harder to fix, and more glued-down parts, but the iPhone Air proves otherwise,” states Elizabeth Chamberlain for the repair outlet. Much of this comes down to clever design, that makes repair possible at the same time as ensuring compactness. A big part of this is the way that Apple made the bottom half of the phone pretty much just battery. Most of the actual electronic components are on a logic board up by the camera. Segmenting the phone in this way makes it easier to access commonly-replaced parts like the battery without having to pull a lot of other parts out of the way first.

[iFixit] refers to this as flattening the “disassembly tree”—minimizing the number of components you have to touch to replace what you’re there to fix. In this regard, the thinness of the iPhone Air is actually a boon. The phone is so thin, it wasn’t possible to stack multiple components on top of each other, so everything is easier to get to. The design is also reasonably modular, which should make routine repairs like USB C port swaps relatively straightforward.

Whatever smartphone you’re working on, it often helps to have a disassembly guide to ensure you don’t wreck it when you’re trying to fix something. [iFixit] remains a stellar resource in that regard. Continue reading “IPhone Air Still Apparently Repairable Despite Its Compact Construction” →

Restoring A Vintage Computer And Its Plotter

September 22, 2025 by 23 Comments

Repairing vintage computers is bread-and-butter for many of us around here. The machines themselves tend to be fairly fixable, assuming spare parts are available and there hasn’t been too much physical damage. Peripherals can be another matter, though. Since they interface with the real world they can have more esoteric problems that aren’t always solvable. [joekutz] was handed just such a device in the form of a CE-150 docking station for a Sharp PC1500 Pocket Computer, which has a plotter built in. Here’s his “tip” for getting plotters like these working again.

The first step here is to disassemble the original, dried out pens to scavenge a few of the parts. The outer case needs to be kept so that it can be put back into the plotter, and a small O-ring is saved as well. To replace the dried-out tips [joekutz] discards the original tips and replaces them with tips from a common ink pen, using shrink wrap tubing to help fit the pen’s tip into the original plotter cylinder. He also takes the ink from the pen to fill the plotter’s cartridge, completing the surgery on the multi-colored plotter and bringing it back to life.

Of course this build goes well beyond the plotter, including bringing the PC1500 back to life as well. There are a few other videos about this project covering that original restoration as well as demonstrating some of the quirks of how this computer is meant to be programmed. But we mostly focused on the plotter here since that is a little bit out of the ordinary, and we’re also sure that refilling ink cartridges of any sort gets under the skin of everyone at HP.

Continue reading “Restoring A Vintage Computer And Its Plotter” →

Mandrel Magic: Small Box Assembly With 3D Printing

September 21, 2025 by 2 Comments

Often, we face tedious tasks with no way around them. Sometimes, you just have to grit your teeth and push through. But small tweaks can make the onerous task a bit easier to handle. [James Bowman] sent in his latest quick project that helps him fold small boxes more efficiently.

To fulfill orders on his previously covered TermDriver2, [James Bowman] is faced with folding thousands of small boxes. To aid in this daunting task, he had the idea of making a tool to streamline the process — every second saved adds up when you’re repeating a task thousands of times. He designed a 3D printed mandrel that pops the flat box blank open as it’s slid over the tapered top, shaping it into a perfect rectangle for easy folding of the top flaps.

The nice thing about 3D printng is how easy it is to iterate on a design. Once James had the first version printed and verified it worked as hoped, he had ideas to improve it, such as adding a second mandrel to twist the box from both the inside and outside and adding a guide on one side to enhance rigidity.

While we often think of 3D printers producing ready-to-use parts, but printed tooling holds great potential for repetitive tasks, and is a huge cost saver compared to traditional methods.