Recent Projects

A fully programmable PCB designed to replace the brains of the iconic calculator watch by Casio. Based on Joey Castillo's Sensor Watch Pro.

Hacking the Casio CA-53W: Outatime Pro

evelien-dekkers Evelien Dekkers

An ESP32-powered desk gadget with six round displays that appears to spin without any visible axle — the trick is mounting the frame on the

YUMO Roulette — A "Floating" Spinning Desk Gadget

yumobuilds YUMO.BUILDS

Number sieves are machines that outran computers, 1920s-1990s. A 1982 design in ATtiny412s, aimed at factoring a 16-digit number.

A Tiny Sieve | Lehmer's Math Machine in ATtinys

Another gimmicky EE businesscard. But engineered to be actually (sort of) practical.

NFC powered synth businesscard

From a hand-drawn waveform to a working PCB: an engineer’s evaluation of language models as analog and mixed-signal design assistants

Hardware Design with LLMs

Explore the computer byte with this educational easy-to-solder kit. Toggle in 8 bits and see their decimal, hex or octal value. With game!

8-bit Workbench ED: hands-on with number systems

Aquatic apex predators with directed energy weapons. For when ill-tempered mutant sea bass just won't do.

Sharks with frickin' laser beams on their heads

Puzzling together a Multitech Microprofessor sound generation board with just some photo's and a ROM dump.

SGB-MPF-I Sound generation board reconstruction

fjkraan fjkraan

An open-source AI agent that sees and controls phones through voice, web, GPIO, and standardized device inputs.

Aiden - AI Agent Hardware for Mobile Phones

dan-peng Dan Peng

LumiPhane transforms a photograph into light, powered by a compact solar system designed for real-world use beyond the grid.

LumiPhane — a 3D Printed Lithophane Memory Lamp

next-builder Next Builder

Systematically quantifying sleep behavior by capturing and analyzing how body weight is distributed across a sleeping surface over time.

Quantifying Sleep Positions With Body Weight

bret-bernhoft Bret Bernhoft

My grid-tie solar system is inherited. There is no need to subscribe (and pay) to get data.

Solar Electric System Monitor

bud-bennett Bud Bennett

This mid-70s version of the Arduino needs to be put together and then put to work!

Siemens SIKIT-DK 8080

This project implements a classic PDP8e (circa 1973) in an FPGA. The project is written in verilog, Front panel is included

PDP8e recreated in an FPGA

My second barn-door tracker, this time made from metal!

Barn Door Star Tracker: all-metal version

ZX Spectrum-compatible homemade retrocomputer based on Z80 CPU + discrete RAM and ROM + Raspberry RP2350B as ULA/chipset

Z80 + RP2350B ZX-compatible homebrew retrocomputer