sporkus / le_chiffre_keyboard_stm32

Le Chiffre keyboard pcb with stm32F072

Le Chiffre Keyboard - STM32 version

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Open sourced PCB originally design by tominabox1 updated to STM32 MCU.

Design goals

• Drop-in replacement to existing cases
• MCU: STM32F072CBT6 (128Kb flash, built-in DFU bootloader) to allow more firmware features
• MX hotswap, Alps support

Firmware

• QMK config
• zmk config
• pre-compiled vial

To flash initially using dfu-util or qmk toolbox, plug in the board or push the reset button while DFU button is held down.

Fabrication

• verified production files can be found here
• pcb dimensions: 84.96x227.34mm
• SK6812 mini 3535 has placement marker on "Data In" pin. Don't confuse it with sk6812-HS mini or sk6812 mini-E.

Misc

3D assembly preview

• online viewer
• step assembly

PCB renders

BoM

interactive BoM

Schematic

Schematic pdf

Case

Credits

tominabox1 for the original design

Changelog

• v0.2.2: change center switch to soldered instead of hotswap. Group buy.
• v0.2.1: added front led bypass jumper
• v0.2.0: improved protection circuit
• v0.1: working initial prototypes