{
  "id": "nxt-alpha-rex",
  "name": "Alpha Rex",
  "family": "nxt",
  "kit": "LEGO MINDSTORMS NXT 2.0 8547",
  "robotKind": "humanoid_biped_walker",
  "source": {
    "portMap": "official-build-instructions",
    "url": "https://www.lego.com/en-us/themes/mindstorms/products/nxt-2-0-8547"
  },
  "controller": {
    "model": "NXT Brick 8547",
    "firmware": "standard-nxt-or-lejos",
    "connection": ["usb", "bluetooth"]
  },
  "ports": {
    "A": { "kind": "motor", "part": "nxt-servo-motor", "role": "right_leg" },
    "B": { "kind": "motor", "part": "nxt-servo-motor", "role": "left_leg" },
    "C": { "kind": "motor", "part": "nxt-servo-motor", "role": "arm_gesture" },
    "1": { "kind": "sensor", "part": "ultrasonic-sensor", "role": "obstacle_detection" },
    "3": { "kind": "sensor", "part": "touch-sensor", "role": "bump_detect" }
  },
  "sensors": [
    { "kind": "ultrasonic", "source": "PORT_1" },
    { "kind": "touch", "source": "PORT_3" }
  ],
  "probeSignature": {
    "version": 1,
    "expectedActivePorts": ["A", "B", "C"],
    "features": ["biped_pair", "arm_motor", "ultrasonic_sensor", "touch_sensor"]
  },
  "programTargets": ["nxt-python"],
  "crossGenNotes": "Bipedal humanoid walker — thematically related to Robot Inventor Charlie (51515-charlie). Biped gait via two-motor leg pair.",
  "license": "CC-BY-4.0"
}