qmk_firmware/keyboards/dumbpad/v1x_right/info.json

{
    "usb": {
        "device_version": "0.1.0"
    },
    "encoder": {
        "rotary": [
            {"pin_a": "D4", "pin_b": "B2"}
        ]
    },
    "bootmagic": {
        "matrix": [3, 4]
    },
    "processor": "atmega32u4",
    "bootloader": "caterina",
    "layouts": {
        "LAYOUT": {
            "layout": [
                {"x":0, "y":0}, {"x":1, "y":0}, {"x":2, "y":0}, {"x":3, "y":0},
                {"x":0, "y":1}, {"x":1, "y":1}, {"x":2, "y":1}, {"x":3, "y":1},
                {"x":0, "y":2}, {"x":1, "y":2}, {"x":2, "y":2}, {"x":3, "y":2},
                {"x":0, "y":3}, {"x":1, "y":3}, {"x":2, "y":3}, {"x":3, "y":3}, {"x":4, "y":3}
            ]
        }
    }
}