{
  "id": "mq135",
  "name": "MQ-135 air quality sensor",
  "category": "sensor",
  "measures": [
    "air quality"
  ],
  "pins": [
    {
      "name": "VCC",
      "role": "power",
      "notes": "Needs 5 V for the heater (about 150 mA): use VIN"
    },
    {
      "name": "GND",
      "role": "ground"
    },
    {
      "name": "DO",
      "role": "digital_out",
      "notes": "Threshold output. Its HIGH level is 5 V: use a voltage divider"
    },
    {
      "name": "AO",
      "role": "analog_out",
      "notes": "Can reach 5 V: use a voltage divider before the ADC"
    }
  ],
  "bus": "analog",
  "voltage": "5",
  "model": {
    "shape": "module",
    "size": [
      32,
      22,
      27
    ],
    "color": "#1F4FA8"
  },
  "keywords": [
    "mq-135",
    "mq135",
    "air quality",
    "nh3",
    "benzene",
    "qualità aria",
    "gas"
  ],
  "sources": [
    {
      "title": "Hanwei MQ-135 datasheet",
      "section": "Sensitive to NH3, NOx, alcohol, benzene, smoke, CO2; heater 5 V"
    },
    {
      "title": "Hanwei MQ-135 datasheet",
      "section": "Needs a burn-in / warm-up time before readings are stable"
    }
  ]
}