Sensitive material of MQ135 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist.The sensors conductivity is more higher along with the gas concentration rising. MQ135 gas sensor has high sensitity to Ammonia, Sulfide and Benze steam, also sensitive to smoke and other harmful gases.


  1. Sensitive for benzene, alcohol, smoke
  2. Output voltage boosts along with the concentration of the measured gases increases
  3. Fast response and recovery
  4. Adjustable sensitivity
  5. Signal output indicator


  1. Working voltage:DC 5V
  2. Working Current: 150mA
  3. DOUT: TTL output
  4. AOUT: Analog output
  5. Preheat time: Over 20s
  6. Dimension: 32mm x 22m x 27mm


In the case of working with a MCU:

  1. VCC ↔ 2.3V ~ 5.0V
  2. GND ↔ power supply ground
  3. AOUT ↔ MCU.IO (analog output)
  4. DOUT ↔ MCU.IO (digital output)


  1. Datasheet.
  2. User Manual.


A hazardous gas detection apparatus for the family, the environment, suitable for ammonia, aromatic compounds, sulfur, benzene vapor, smoke and other gases harmful gas detection, gas-sensitive element test concentration.

Air quality sensor is for detecting a wide range of gases, including NH3, NOx, alcohol, benzene, smoke and CO2. Ideal for use in office or factory, simple drive and monitoring circuit.


  1. 1 X Alcohol Gas Detection Sensor Module MQ-135 For Arduino


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