Link to motivating blog post

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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) ![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 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, 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. 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) * Keyboard Maintainer: [Peter J. A. Cock](https://github.com/peterjc)
* Hardware Supported: Tutte Coxeter 36e (single PCB) with Raspberry Pi Pico * Hardware Supported: Tutte Coxeter 36e (single PCB) with Raspberry Pi Pico
* Hardware Availability: https://github.com/peterjc/gamma-omega * Hardware Availability: https://github.com/peterjc/gamma-omega