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Waveshare Benzene/Alcohol/Smoke Gas Sensor (MQ-135)


  • 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


  • 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.

Selection Guide

Part Number Sensitive Gas Application
MQ-135 Gas Sensor benzene, alcohol, smoke Air quality monitor
MQ-2 Gas Sensor LPG, propane, hydrogen Gas leakage detector
MQ-3 Gas Sensor alcohol, ethanol Car alcohol alarm, breathalyser
MQ-5 Gas Sensor LPG, natural gas, coal gas Gas leakage detector
MQ-7 Gas Sensor carbon monoxide Carbon monoxide monitor

Package Content:

Weight: 0.011 kg

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

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