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  • Sensitive for benzene, alcohol, smoke
  • 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
  • Weight: 0.011 kg


  • Air quality monitor

How to Use

In the case of working with a MCU:

  • VCC: 2.5V ~ 5.0V
  • GND: power supply ground
  • AOUT: MCU.IO (analog output)
  • DOUT: MCU.IO (digital output)


Development resources: demo codes, schematic, datasheets, etc.
Wiki: www.waveshare.com/wiki/MQ-135_Gas_Sensor

Selection Guide

Part NumberSensitive GasApplication
MQ-135 Gas Sensorbenzene, alcohol, smokeAir quality monitor
MQ-2 Gas SensorLPG, propane, hydrogenGas leakage detector
MQ-3 Gas Sensoralcohol, ethanolCar alcohol alarm, breathalyser
MQ-5 Gas SensorLPG, natural gas, coal gasGas leakage detector
MQ-7 Gas Sensorcarbon monoxideCarbon monoxide monitor

Parts List

  • MQ-135 Gas Sensor x 1
  • 4-pin custom connector jumper wire x 1

Gas Sensor (MQ135) - Benzene, Alcohol, Smoke

  • Brand: Waveshare
  • Product Code: WVSHARE-73
  • Reward Points: 8
  • Availability: Out Of Stock
  • £10.01

  • Ex Tax: £8.34
  • Price in reward points: 100

Gas Sensor (MQ3) - Alcohol, Ethanol

Gas Sensor (MQ3) - Alcohol, Ethanol


Sensitive to Alcohol and Ethanol - ideal for Breathalyser testing

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CO, Alcohol and VOC MICS5524 Gas Sensor Breakout [3199]

CO, Alcohol and VOC MICS5524 Gas Sensor Breakout [3199]


The MiCS-5524 is a robust MEMS sensor for indoor carbon monoxide and natural gas leakage detection, ...

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