qmk_firmware/keyboards/redox/rev1/base/keyboard.json

{
    "usb": {
        "device_version": "1.0.0"
    },
    "matrix_pins": {
        "cols": ["F5", "F6", "F7", "B1", "B3", "B2", "B6"],
        "rows": ["D4", "D7", "E6", "B4", "B5"]
    },
    "diode_direction": "COL2ROW",
    "split": {
        "serial": {
            "pin": "D0"
        }
    },
    "ws2812": {
        "pin": "D3"
    },
    "development_board": "promicro"
}