Template: MQ-7 Gas Sensor Spec

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The gas sensing material used in the MQ-7 gas sensor is tin dioxide (SnO2), which has low conductivity in clean air. When carbon monoxide gas exists in the environment where the sensor is located, the conductivity of the sensor increases with the increase of carbon monoxide gas concentration in the air.


  • Sensitive for carbon monoxide
  • Output voltage boosts along with the concentration of the measured gases increases
  • Fast response and recovery
  • Adjustable sensitivity
  • Signal output indicator


  • Power: 2.5V ~ 5.0V
  • Dimension: 40.0mm * 21.0mm
  • Mounting holes size: 2.0mm


PIN Description
DOUT Digital data output
AOUT Analog data output
GND Ground
VCC Power input (2.5V ~ 5.0V)