SP56

A ZMK-Powered BLE Keyboard, Inspired By Lily58 & Sofle

:warning: This is a partially tested project. Do not use to create your own copy unless you are willing to debug the hardware and/or firmware.

Flash bootloader

Bootloader is pre-loaded on assembled pcbs. If you source your own BLE module you will need to unlock the module and flash the bootloader using the Nordic nrf command line tool.

$ nrfjprog --recover --log 

$ nrfjprog -f nrf52 --program firmware/bootloader/COBO_nrf52840_bootloader-0.3.2-184-g64ea299_s140_6.1.1.hex

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Upload Firmware

• See ZMK docs for instructions on setting up ZMK and custimizing firmware.
  • https://zmkfirmware.dev/docs/user-setup/
  • https://zmkfirmware.dev/docs/customization
• Default *.uf2 files are pre-loaded on assembled pcbs. If you sourced and assembled your own pcb, you can file deafult pre-built firmware here:
  • https://github.com/ericrlau/COBO-zmk-config/releases

PCB

• Source files for pcb are in this repo. They are split into three kicad projects:
  • SP56: main pcb, left and right combined.
  • SP56_Bottom: Bottom cover PCB. Left and right use the same part so only one copy is created.
  • SP56_Plate: Switch plate PCB. This must be 1.2mm pcb to allow Kaihl Choc V1 switches to snap in. Left and right use the same part so only one copy is created.
  • NOTE: KiCad files are created with nightly KiCad 5.99 builds, they are not compatible with current stable release of KiCad 5.
• Bill of materials BOM Link

Build Guide For PCBA

Build Guide Link

Images

Prototype Build

Main PCB

FR4 Plate

Bottom PCB