qmk-firmware/keyboards/bastardkb/charybdis/3x5/v2/stemcell/info.json

{
    "keyboard_name": "Charybdis Nano (3x5) STeMCell",
    "usb": {
        "device_version": "2.0.0"
    },
    "ws2812": {
        "driver": "pwm"
    },
    "matrix_pins": {
        "cols": ["F5", "B6", "D7", "E6", "B4"],
        "rows": ["F7", "C6", "D4", "B5"]
    },
    "diode_direction": "ROW2COL",
    "split": {
        "soft_serial_pin": "D2"
    },
    "processor": "STM32F411",
    "bootloader": "stm32-dfu"
}