Custom Keyboard

PCB + ZMK FIRMWARE — IN DEV

SOURCE ↗

This started over a year ago as a 2-key keyboard — a copy-paste gadget. I designed the PCB myself in JLCPCB, soldered it together, and made the housing in Onshape, 3D printed. Small, but the full loop: board design, assembly, enclosure.

Recently I expanded the idea into a full 65% wireless board with dimensions fit to my own requirements: a 68-key, 5×14 matrix running on a nice!nano v2 (nRF52840), with the rows on direct GPIO and the columns scanned through an MCP23017 I2C expander — one diode per key for full N-key rollover. The design also carries a nice!view memory-LCD display and an EC11 rotary encoder.

The firmware is ZMK, written to fit how I actually work (config repo linked above): multiple BLE host profiles, ZMK Studio support for runtime remapping over USB or BLE, display modes cycled from the encoder — plus a built-in WPM typing test. Switches are soldered; keycaps are being designed through YUZUKeycaps, and a CAD housing case is next.

Where it started — the 2-key copy-paste gadget, self-designed PCB in a 3D-printed housing
FIG 01 — Where it started — the 2-key copy-paste gadget, self-designed PCB in a 3D-printed housing
Keycap set in design via YUZUKeycaps — Greek-letter and math-symbol sublegends
FIG 02 — Keycap set in design via YUZUKeycaps — Greek-letter and math-symbol sublegends