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![Partial Tutte-Coxeter Graph (26/30 vertices, 36/45 edges)](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvS5QfAl7YotptMtpu0nG8XOHOsqG2vocUFF2sRgrn_QwAcUQNhDkctHt_42rQor3Bb5tbAW6FiOsYqv2craP086HMTuAqWk9U0A4yOeEsQkhyphenhyphenUxoayJWf5e-N3_Jg1TC1p9YAiVPTK02pEVCUu3hl72REIk5BAjXgZGoF7T-NWQ28iRirwFs6yzFzAe0/w200-h194/Screenshot%202025-05-28%20at%2014.59.35.png)
This is firmware for an PR2040 monoblock 36 key design (three rows of five, and three thumb keys, for each hand).
This is a *diode-free* design using a sparse 13 by 13 scanning matrix designed from a partial Tutte-Coxeter graph
(using only 26 vertices or GPIO pins with 36 edges or keys - see this
[blog post](https://astrobeano.blogspot.com/2025/05/ergo-mech-keyboard-wiring-using-tutte-coxeter-graph.html)
for background although the final pin selection changed).
The first physical PCB for this is designed to fit in the [Gamma Omega keyboard](https://github.com/unspecworks/gamma-omega) case,
and use the same Raspberry Pi Pico based microcontroller board.
This is a diode-free design using a sparse 13 by 13 scanning matrix designed from a partial Tutte-Coxeter graph
(using only 26 vertices or GPIO pins with 36 edges or keys).
* Keyboard Maintainer: [Peter J. A. Cock](https://github.com/peterjc)
* Hardware Supported: Tutte Coxeter 36e (single PCB) with Raspberry Pi Pico
* Hardware Availability: https://github.com/peterjc/gamma-omega