{
  "id": "ky-039",
  "name": "KY-039 finger heartbeat sensor",
  "category": "sensor",
  "measures": [
    "heart rate"
  ],
  "pins": [
    {
      "name": "S",
      "role": "analog_out",
      "notes": "Very small signal that changes with each heartbeat. To an ADC1 pin (GPIO 32 to 39)"
    },
    {
      "name": "VCC",
      "role": "power",
      "notes": "Middle pin. Use 3V3"
    },
    {
      "name": "GND",
      "role": "ground",
      "notes": "Marked - on the board"
    }
  ],
  "bus": "analog",
  "voltage": "3.3-5",
  "model": {
    "shape": "module",
    "size": [
      18.5,
      15,
      8
    ],
    "color": "#1A1A1A"
  },
  "keywords": [
    "ky-039",
    "heartbeat",
    "finger",
    "heart rate",
    "battito",
    "cardiaco"
  ],
  "sources": [
    {
      "title": "Joy-IT KY-039 datasheet",
      "section": "IR LED and phototransistor through the finger; pins S, +, -. Signal is weak and noisy"
    }
  ]
}