# Tutte Coxeter 36e

![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).
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

Make example for this keyboard (after setting up your build environment):

    make tutte_coxeter_36e:default

Flashing example for this keyboard:

    make tutte_coxetter_36e:default:flash

See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).

## Bootloader

Enter the bootloader in 3 ways:

* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (bottom left key, Qwerty `z`) and plug in the keyboard
* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available