A custom 9-key mechanical macropad with a rotary encoder and OLED display, built around the Seeed XIAO RP2040. Every key is freely configurable through a desktop app, and the encoder browses through profiles shown on the OLED. PCB and case designed from scratch in KiCad and Tinkercad.
Just finished setting up my account, converting stl files to .step ones and I added a demo URL to my project.
Finished my LG Hackpad! 🎉
This is a 9-key mechanical macropad with a rotary encoder and an OLED display, built around the Seeed XIAO RP2040.
What I did:
Designed the schematic and the 2-layer PCB completely from scratch in KiCad (my first PCB ever!). Hand-routed the switch matrix with per-key 1N4148 diodes, added a GND pour and fitted everything under 100x100mm (final: 68x99.68mm).
Designed the case in Tinkercad: an open tray design with the XIAO RP2040 exposed, an anti-flex support grid under the PCB, USB cutout and 4x M2 standoffs - printable without supports.
Built the firmware (CircuitPython): the encoder browses through profiles on the OLED, and each of the 9 keys is freely configurable via a JSON config.
Made a desktop configurator app (Python + CustomTkinter) to assign key combos or custom scripts to every key.
Biggest challenge as a first-timer: hand-routing a 2-layer board without crossing nets while keeping a clean GND pour. Super happy
with how it turned out!
