Elexhere

DIY Smart Button Gets Surprisingly Complicated | Hackadayhttps://hackaday.com/2026/04/22/diy-smart-button-gets-surprisingly-complicated/

There’s a reason that the standards specifications for various wireless communications protocols are extremely long and detailed. [Made by Dennis] found this out first hand when he decided to…

Build a Giant 2,500-LED Wall on a Budget - Hackster.iohttps://www.hackster.io/news/build-a-giant-2-500-led-wall-on-a-budget-ebcb2cbd4e76

Chris Maher made a massive, wall-sized 2,500-LED matrix without breaking the bank using an ingenious design powered by LED strips.

Check Out This 7-Segment Display That Runs on Air - Hackster.iohttps://www.hackster.io/news/check-out-this-7-segment-display-that-runs-on-air-8562ef9e05e3

Clock
Vacuum

This air-powered 7-segment display uses pneumatic "transistors" and vacuum pressure to physically transform the segments.

Painting the Time on Flip Sequins - Hackster.iohttps://www.hackster.io/news/painting-the-time-on-flip-sequins-d57d924a2967

Clock
Sequin

Sequino is a robotic clock that swaps pixels for flip sequins, using an H-bot system to "paint" the time on a shimmering canvas.

Implementing PCIe Over Fiber Using SFP Modules | Hackadayhttps://hackaday.com/2026/04/11/implementing-pcie-over-fiber-using-sfp-modules/

Pcie
Sfp

Although we can already buy commercial transceiver solutions that allow us to use PCIe devices like GPUs outside of a PC, these use an encapsulating protocol like Thunderbolt rather than straight P…

This $15 Breadboard Upgrade Makes Life Easier - Hackster.iohttps://www.hackster.io/news/this-15-breadboard-upgrade-makes-life-easier-aa2ffa6e96c2

Power
Usb-c

Power your breadboard anywhere with the BrødBoost-C2, a tiny, USB-C powered regulator delivering clean 3.3V/5V power for just $14.99.

Easily Add Texture to Your 3D Prints with the Free BumpMesh Web Tool - Hackster.iohttps://www.hackster.io/news/easily-add-texture-to-your-3d-prints-with-the-free-bumpmesh-web-tool-c25191dc844c

Stefan from CNC Kitchen created the BumpMesh web tool to make 3D model texturing super easy.

Turning Dollar-Store Foam Into a High-Tech FPV Plane - Hackster.iohttps://www.hackster.io/news/turning-dollar-store-foam-into-a-high-tech-fpv-plane-bb837c14dff6

Airplane

With just a few basic components like a Seeed Studio XIAO ESP32S3, you can turn a $2 toy glider into a high-tech FPV airplane.

Playful ‘Space Dice’ Kit Shows Off Clever Design | Hackadayhttps://hackaday.com/2026/03/28/playful-space-dice-kit-shows-off-clever-design/

[Tommy] at Oskitone has been making hardware synth kits for years, and his designs are always worth checking out. His newest offering Space Dice is an educational kit that is a combination vintage …

Add Laser Engraving to Your Desk for Just $64 - Hackster.iohttps://www.hackster.io/news/add-laser-engraving-to-your-desk-for-just-64-92e7312e464e

Laser

Build your own mini laser engraver for $64! This ATmega328-powered project burns detailed designs into wood, leather, and paper.

The Insane Engineering Behind a DIY Real-Time Spray Paint Mixer - Hackster.iohttps://www.hackster.io/news/the-insane-engineering-behind-a-diy-real-time-spray-paint-mixer-b6dfbad35568

Paint

Sandesh Manik wanted a kind of real-time color-mixing system for spray paint and bringing that to life required some insane engineering.

Build This Open-Source Graphics Calculator | Hackadayhttps://hackaday.com/2026/03/23/build-this-open-source-graphics-calculator/

Graphics calculators are one of those strange technological cul-de-sacs. They rely on outdated technology and should not be nearly as expensive as they are, but market effects somehow keep prices w…

The 3DFX Voodoo Lives Again In An FPGA | Hackadayhttps://hackaday.com/2026/03/22/the-3dfx-voodoo-lives-again-in-an-fpga/

FPGA
3d

The 3DFX Voodoo was not the first dedicated 3D graphics chipset by any means, but it became the favourite for gamers among the early mass-market GPUs. It would be found on a 3D-processing-only PCI …

How I 3D Printed My Own Lego-Compatible Train Bridges | Hackadayhttps://hackaday.com/2026/03/16/how-i-3d-printed-my-own-lego-compatible-train-bridges/

Lego train sets have been available for decades, now. The Danish manufacturer long ago realized the magic of combining its building block sets with motors and plastic rails to create real working r…

This Printed Zipper Repair Requires No Unsewing | Hackadayhttps://hackaday.com/2026/03/14/this-printed-zipper-repair-requires-no-unsewing/

If a zipper breaks, a 3D printer might not be the first tool one reaches for — but it’s more feasible than one might think. [MisterJ]’s zipper slider replacement is the kind of 3D…

3D Printing A Harmonic Pin-Ring Gearing Drive | Hackadayhttps://hackaday.com/2026/03/11/3d-printing-a-harmonic-pin-ring-gearing-drive/

3dprint

Cycloidal drives are a type of speed reducer that are significantly more compact than gearboxes, but they still come with a fair number of components. In comparison, the harmonic pin-ring drive tha…

A Rotary Dial The 3D Printed Way | Hackadayhttps://hackaday.com/2026/03/11/a-rotary-dial-the-3d-printed-way/

3dprint
Dual

There’s a meme which may have a basis in truth, of a teenager left clueless when presented with a rotary telephone. The dial, in reality a mechanical pulse chain generator, was once ubiquitou…