qmk_firmware/keyboards/atset/at3/info.json

{
  "keyboard_name": "AT3",
  "manufacturer": "Atset",
  "maintainer": "atset",
  "usb": {
    "vid": "0xFEED",
    "pid": "0x6060",
    "device_version": "0.0.1"
  },
  "matrix_pins": {
    "cols": ["B6", "B5", "B4"],
    "rows": ["D2"]
  },
  "diode_direction": "COL2ROW",
  "processor": "atmega32u4",
  "bootloader": "atmel-dfu",
  "layouts": {
    "LAYOUT": {
      "layout": [
        {"x": 0, "y": 0, "matrix": [0, 0]},
        {"x": 1, "y": 0, "matrix": [0, 1]},
        {"x": 2, "y": 0, "matrix": [0, 2]}
      ]
    }
  }
}