38 lines
2.3 KiB
Markdown
38 lines
2.3 KiB
Markdown
# Tutte Coxeter 36k
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This is firmware for an Raspberry Pi Pico PR2040 controller monoblock 36 key design
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(three rows of five, and three thumb keys, for each hand). This is a *diode-free*
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design with a sparse 13 by 13 scanning matrix designed using a partial
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[Tutte-Coxeter](https://en.wikipedia.org/wiki/Tutte%E2%80%93Coxeter_graph) graph
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(using only 26 vertices or GPIO pins with 36 edges or keys - see this
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[blog post](https://astrobeano.blogspot.com/2025/05/ergo-mech-keyboard-wiring-using-tutte-coxeter-graph.html)
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for background, although the final pin selection and trace routing changed).
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The first physical PCB for this was designed using the [Gamma Omega
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keyboard](https://github.com/unspecworks/gamma-omega) footprint from Ergogen.
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This is intend use the same Raspberry Pi Pico YD-RP2040 microcontroller board
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to fit the same 3D printed case, including reset button placement.
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* Keyboard Maintainer: [Peter J. A. Cock](https://github.com/peterjc)
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* Hardware Supported: Tutte Coxeter 36k (single PCB) with Raspberry Pi Pico
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* Hardware Availability: https://github.com/peterjc/gamma-omega
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Make example for this keyboard (after setting up your build environment):
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make tutte_coxeter_36k:default
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Flashing example for this keyboard:
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make tutte_coxetter_36k:default:flash
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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).
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## Bootloader
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Enter the bootloader in 3 ways:
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* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (bottom left key, Qwerty `z`) and plug in the keyboard
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* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
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* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available
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