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Link to wikipedia page for Tutte-Coxeter graph

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keyboards/tutte_coxeter_36k/readme.md
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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
This is firmware for an Raspberry Pi Pico PR2040 controller monoblock 36 key design
(three rows of five, and three thumb keys, for each hand). This is a *diode-free*
design with a sparse 13 by 13 scanning matrix designed using a partial
[Tutte-Coxeter](https://en.wikipedia.org/wiki/Tutte%E2%80%93Coxeter_graph) 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).
for background, although the final pin selection and trace routing 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.