A uterus-shaped period tracker that runs DOOM

Difficulty

Expert

AI-buildability

2/5

AI can write the RP2040 firmware and game logic, but the custom shaped PCB with capacitive touch pads, layout, and assembly are hands-on hardware work it can't do much for.

Time

A few weeks

Cost

$50–100

Estimates based on the original write-up. How AI-buildability is scored. Building with an AI assistant? Connect it to Afterware (free MCP server).

Clotty is a palm-sized menstrual cycle tracker built into a uterus-shaped PCB, complete with touchpad ovaries. The designer wanted it to scream "HELLO I AM A PERIOD TRACKING DEVICE," and the Tamagotchi-style playfulness is the point. It runs on an RP2040 with a color LCD and a small set of sensors.

The hardware works and the essentials are in place for software, but the project is still in active development. The maker's fork of RP2040-DOOM is the proof of concept that the board can run the game, and the design brief is blunt: the device never uploads cycle data to a remote server and never harvests, discloses or sells it.

Worth stealing: the pairing of a pointedly unsubtle enclosure with a privacy-first data model. Put a game loop on a small RP2040 board with a color display and touch inputs, and you get a gadget people will actually pick up.