This open-source keyboard, inspired by the Atreus and based on the PyKey60, features an on-board RP2040 and CircuitPython for easy keymap update.
44 keys, low-profile Kailh Choc with hotswap sockets
on-board RP2040 controller with CircuitPython
14 mm height from desk to top of keycaps
speaker/buzzer on board
Why did I create a custom board instead of using a Raspberry Pi Pico? The Pico wouldn't allow for the thinnest keyboard. Its position would need room below the PCB and thus would also need a bottom plate to enclose it all, defeating the whole point of an ultra-low profile keyboard.