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keyboards/tutte_coxeter_36k/readme.md
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# Gamma-Omega T36K (Tutte Coxeter 36 keys)
# Gamma-Omega TC36K keyboard firmware
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
[Tutte-Coxeter](https://en.wikipedia.org/wiki/Tutte%E2%80%93Coxeter_graph) graph
(split 3x5_3 - three rows of five, and three thumb keys, for each hand): the
[Gamma Omega TC36K keyboard](https://github.com/unspecworks/gamma-omega/tree/main/tc36k).
This is a *diode-free* design with a sparse 13 by 13 scanning matrix designed using a
partial [Tutte-Coxeter Graph](https://en.wikipedia.org/wiki/Tutte%E2%80%93Coxeter_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 and trace routing changed).
@ -42,11 +43,6 @@ The keys here are labeled as per Qwerty, with L1, L2, L3, R3, R2, and R1 for the
| Z | X | C | V | B | | N | M | , | . | / |
| | | L1 | L2 | L3 | | R3 | R2 | R1 | | |
The first physical PCB for this was designed using the [Gamma Omega
keyboard](https://github.com/unspecworks/gamma-omega) footprint from Ergogen.
That is intended for use with the same Raspberry Pi Pico YD-RP2040 microcontroller
board in order to fit the same 3D printed case, including reset button placement.
The QMK firmware follows the `LAYOUT_split_3x5_3` QMK community layout convention, making
it much easier to use with an existing layout like Miryoku. Also, the Raspberry Pi Pico
controller's user LED on GPIO pin 25 is set to show the Caps Lock state.