Show HN: A Truly Modular Keyboard

A truly modular keyboard with rearrangeable keys, magnetic cases and Bluetooth! Key Features • Video Demo • PCB • Case • Credits • License Video Demo Key Features Rearrangeable layout where every key is its own 1u PCB CH32V003 RISC-V microcontroller on every key STM32WB55RGV6 main board with Bluetooth and USB Pogo pins on all 4 sides of every key for power and I2C Magnetic cases to hold the modules together Key programming from the main board over pogo pins 2MB QSPI flash (W25Q16JV) to store the key firmware Battery charging with the BQ25895 and solder pads for a 1S LiPo Buck-Boost converter (TPS631000) RGB status LED USB-C with ESD protection Ceramic Bluetooth antenna PCB Designed in KiCad! There are two boards, the Keybit and the Keyword, and both are 1u (19.05mm x 19.05mm). Keybit A single key with a Cherry MX switch and a CH32V003. Every side has pogo pins for 3.3V, GND and I2C so it can connect to the keyword or to other keybits, and the pads on the corners are for programming. Schematic: Layout: Keyword The main board that the keybits connect to. It is split into two PCBs that stack on top of each other. The top one has the STM32WB55RGV6, the antenna and the flash, and the bottom one has the USB-C, the charger and the buck-boost converter. The 3 pogo pins on the top are for programming the keybits. Schematic: Layout: 3D View: Case Custom designed cases in Onshape, the STEP files are in the cad folder. Credits This project uses: KiCad OnShape for case design Blender for 3D renders STM32CubeMX Hack Club Forge You may also like... Ember - A USB-C powered reflow hotplate with Bluetooth Cyberboard - A Raspberry Pi Pico-sized STM32 development board with Bluetooth Trace - A comprehensive PCB ruler with reference footprints Linea - An EMR tablet License MIT notaroomba.dev · GitHub @NotARoomba · notaroomba.dev · GitHub @NotARoomba ·