Misc Hacks

4115 Articles

PCB Map Display Keeps An Eye On Family

May 23, 2026 by 20 Comments

PCBs are traditionally designed with traces laid out to support a circuit full of electronic components. However, they’ve become increasingly popular as a way to produce functional visual artworks. This PCB map from [Jonathan] is a great example.

The PCB was designed as a map of the California East Bay area. The roads are laid out as the top-side copper layer, while the land and roads are used for the top solder mask layer, with the flipped land and roads area making up the solder mask on the bottom side. The map data itself was cribbed from Snazzy Maps. Behind the PCB, [Jonathan] mounted a 64 x 32 RGB LED array, which can be seen glowing through from behind the material. The LEDs are controlled by an ESP32, which grabs location data from [Jonathan’s] family member’s mobile devices over MQTT, and uses it to light their positions on the map. Files are on Github for the curious.

If you’ve got a family that is open to location tracking, and the money to pay for a custom PCB, you could probably recreate this project yourself. We’ve seen some other great PCB maps before, too, like this amazing metro tracker. Video after the break.
Continue reading “PCB Map Display Keeps An Eye On Family” →

Touchable POV Display Blooms In Mid Air

May 23, 2026 by 14 Comments

Typically, when we think of touch screens, we think of LCDs or OLEDs with a resistive or capacitive sensing layer laid over the top. However, a team from the University of Chicago has developed an entirely different type of touch-sensitive display that uses persistence-of-vision techniques.

The project is called BloomBeacon. It consists of a pair of spinning arms to create a stable round display in mid-air. One arm is covered in LEDs, while the other is covered with capacitive pads for touch sensing purposes.  The trick behind this device is evident in the name—the device uses soft, flexible arms which are hinged and “bloom” upwards as the device spins up to speed. This makes it safe to physically interact with the spinning blades while they’re in motion to create a touch-interactive display. The device can thus display user interface elements like buttons that the viewer can interact with by reaching out and touching them directly.

Normally we’d advise not sticking your fingers in a rotating piece of machinery, but in this case, BloomBeacon was designed specifically to make this safe. Even sticking your fingers or hand right through the spinning arms won’t cause injury.

We’ve featured some other cool POV projects over the years, like this neat volumetric display. Video after the break.

Continue reading “Touchable POV Display Blooms In Mid Air” →

Passive Bug Zapper Tracks Its Kill Count

May 23, 2026 by 31 Comments

If it’s summer in a warm, humid climate, bugs can be the bane of your existence. A natural solution is to place a passive bug zapper to catch bugs at night. But what if that isn’t fancy enough? [Nicolas Boichat] spices it up with a passive bug zapper that tracks its kill count.

But how exactly do you detect a bug zap? With an antenna, of course! When a bug gets caught, it arcs, creating an electromagnetic pulse. A small loop antenna on the backside of the zapper receives the signal.
Continue reading “Passive Bug Zapper Tracks Its Kill Count” →

Get That Windows 7 Feel In An OS That Still Gets Updates

May 21, 2026 by 65 Comments

Do you want to go back to an era when Windows was… simpler? Back when things worked, before the AI and the bloat took over your hard drive and RAM space in equal measure? You might like to give Classic 7 a spin (via The Register).

From the drop, we should state that Classic 7 is not Windows 7 at all. Instead, it’s a reskin of Windows 10, specifically, the IoT Enterprise LTSC version. This is a particularly attractive version of Windows 10, as Microsoft has promised long-term support in terms of security updates until 2032. It also strips out annoying consumer-focused bloat like the Xbox gaming overlay and Cortana, and it eliminates forced feature updates that have become the norm in modern Windows installs. Combine all those niceties with the clean and simple feel of the recreated Windows 7 interface, and you have a beautiful operating system that has everything you need and nothing you don’t.

There are, of course, some hurdles to jump over; you’d need to find an appropriate license for this version of Windows and all that jazz. But if you long for the days before Microsoft so cruelly eviscerated the Start Menu and started making everything worse, you might find that Classic 7 is for you.

[Thanks to Stephen Walters for the tip!]

A tiny, rectangular, 3D-printed box with an e-paper display and a fortune cookie design beneath it. The fortune reads: "Your next firmware update will both solve and create problems."

E-Fortune Cookie Will Humble, But Never Crumble

May 21, 2026 by 5 Comments

Will your next project be a success? Only time will tell, but if you build [gokux]’s tiny ESP32 fortune cookie, we predict that, at the very least, there won’t be any crumbs involved.

After briefly entertaining the idea of shoving an ESP32 in a standard fortune cookie, [gokux] thought better of it and came up with this instead. Once shaken, this small gadget displays a fortune on its e-paper screen. It can store over 3,000 fortunes and works entirely offline, so you’re never without an oracle.

Inside you’ll find a Seeed Xiao ESP32-S3 Plus and a matching e-paper display board. [gokux] is detecting the shakes with an MPU-6050 accelerometer, and powers everything with a small Li-Po pouch.

If you tire of the fortunes that shake out, the small buttons on the left side will get you into the other modes, which are a dice roller and a coin flipper. Again, you just shake the thing until you get what you want. Be sure to check it out in the video after the break.

Want to know how an MPU-6050 works, and what it looks like under the hood? Yeah, we thought so.

Continue reading “E-Fortune Cookie Will Humble, But Never Crumble” →

Sliding-Screen Cyberdeck Has Chunky, Rugged Design

May 21, 2026 by 26 Comments

[Jankbu] needed a new computer, but had little interest in purchasing a modern laptop off the shelf. Instead, it was time to build a cyberdeck with a neat modular design to suit his exact needs.

The heart of the build is a Raspberry Pi 5, which provides a good amount of computing power for regular tasks. It’s wrapped up in a 3D-printed enclosure with rail mounts on the back, along with a NOS 450 TKL mechanical keyboard, offering full-travel keys in a compact layout. The 10.1″ IPS touchscreen display is mounted on sliding rails to cover the keyboard when it’s not needed. A smattering of buttons live around the screen, in a manner akin to so many industrial controllers. On either side, the deck has large grab handles, with one side featuring custom horizontal and vertical scroll controls, while the other rocks a trackball.  Power is via NP-F batteries, which are more commonly used to run Sony camcorders.

Unlike so many cyberdecks, [Jankbu] didn’t just build the device to look cool—it also serves a practical purpose. It’s great for running Freecad, and the rail mounts on the rear make it perfect for mounting around the workshop during a job as needed. Files are on Github for those eager to learn more.

What’s fun about this build is that it’s not just a show piece, it’s something that gets used every day. That’s a testament to [Jankbu’s] well-reasoned design, that considered what the device was for before it was put together. We’ve featured plenty of other fantastic cyberdecks in the past, too. Video after the break.

Continue reading “Sliding-Screen Cyberdeck Has Chunky, Rugged Design” →

Building A Device To Map Magnetic Fields

May 19, 2026 by 3 Comments

Magnetic fields are all around us. We can’t really feel or see them ourselves, per se, but we can map them with the right hardware, like this device built by [edosari50].

The build uses an ESP32 microcontroller, which is built on to a board with an integrated 4.3″ touchscreen LCD. It’s paired with an Arduino Nano, which does the work of actually talking to a pair of EMS100 Fluxgate magnetic sensors. The slower, less capable Arduino handles the low-level chatter and then passes the readouts to the ESP32 over a UART connection. Power is courtesy of a pair of 18650 lithium-ion cells, and a XL4005 DC-DC converter. A lithium-ion charging module is on hand to keep the batteries topped off safely.  Scan results are visualized on the device itself using a heatmap representation, and can also be exported to SD card for later analysis if so desired.

Unless you’re in the geological field or otherwise hunting for stuff underground, this probably isn’t a tool you’ll have a lot of use for. However, if you like finding magnetic anomalies and investigating them, it might be very much in your wheelhouse. We’ve featured other tools for magnetic visualization before, too. Video after the break.
Continue reading “Building A Device To Map Magnetic Fields” →