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4x4 keyboard

4x4 is a modular ortholinear keyboard/MIDI controller design with per-key LEDs – shared by key-yack.
Published November 15, 2022
Creators! Feel free to tip me off about your keyboard related projects to bring them to 120K readers.

Fellow redditor key-yack aka nezumee shared a modular 4x4 PCB with per-key RGB intended to be used as a base for prototyping MIDI controllers with QMK firmware.

It's using PCB pieces that are small enough to be cheap to order from PCB prototyping fabs but are soldered together to make a bigger one-piece keyboard. 4x4 macropad, Planck and a few other layouts are supported; it allows for 16 to 64 MX switches with hotswap and per-key RGB – key-yack.

The system consists of two parts:

  • Head PCB with MCU and other connectors
  • Key PCB having 16 hotswap Cherry MX switches in 4x4 layout



Github repo:

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Published on Tue 15th Nov 2022. Featured in KBD #103 (source).


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