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keyboards/tutte_coxeter_36k/readme.md
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# Tutte-Coxeter 36K
![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 a Raspberry Pi Pico PR2040 controller monoblock 36 key design
(split 3x5_3 - 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
@ -10,6 +8,8 @@ This is firmware for a Raspberry Pi Pico PR2040 controller monoblock 36 key desi
[blog post](https://astrobeano.blogspot.com/2025/05/ergo-mech-keyboard-wiring-using-tutte-coxeter-graph.html)
for background, although the final pin selection and trace routing changed).
![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 matrix shows the full 15×15 Tutte-Coxeter bipartite scanning matrix with the
two unused rows and columns last (❌), and the further 9 keys this would allow (⭕)
if using 30 GPIOs rather than just 26 for a 13×13 scanning matrix. The allocation