keychron_qmk_firmware/keyboards/handwired/onekey/nucleo_f446re/readme.md

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# STM32 Nucleo-L432 onekey
To trigger keypress, short together pins *A1* and *A2*.
You'll also need to connect `VIN`, `GND`, USB `D+` to `PA12`/`D2`, and USB `D-` to `PA11`/`D10`.