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  • Sensitive for alcohol, ethanol
  • Output voltage boosts along with the concentration of the measured gases increases
  • Fast response and recovery
  • Adjustable sensitivity
  • Signal output indicator
  • Weight: 0.009 kg


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


  • Car alcohol alarm
  • Breathalyser

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 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-3 Gas Sensor x 1
  • 4-pin custom connector jumper wire x 1

Gas Sensor (MQ3) - Alcohol, Ethanol

  • Brand: Waveshare
  • Product Code: WVSHARE-75
  • Reward Points: 7
  • Availability: 2
  • £9.17

  • Ex Tax: £7.65
  • Price in reward points: 100

Gas Sensor (MQ3) - Alcohol - Grove

Gas Sensor (MQ3) - Alcohol - Grove


The Grove MQ3 Gas Sensor module is useful for gas leakage detecting (in home and industry). It can ...

Qty: 2

Gas Multichannel Sensor (Xadow)

Gas Multichannel Sensor (Xadow)


The MiCS-6814 is a robust MEMS sensor for the detection of pollution from automobile exhausts and ...


Gas Multichannel Sensor (Grove)

Gas Multichannel Sensor (Grove)


Grove – Multichannel Gas sensor is a environment detecting sensor with a built in MiCS-6814 which c ...

Qty: 2

Gas Sensor (MQ135) - Benzene, Alcohol, Smoke
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, ...

Qty: 1