Working Principle:

The MQ-2 Gas Sensor module detects gas leakage in home and industry.
They are useful in gas leakage detection of LPG, propane, methane, i-butane, alcohol, Hydrogen, and smoke. They are sensitive to a range of gasses and are used indoors at room temperature.


Pin Configurtion:

Vcc: 5v


A0: Analog pin of arduino

D0: Digital pin of arduino:



  • Wide detecting scope
  • High sensitivity and fast response
  • Long life and stable
  • Simple drive circuit


  • Detects or measure Gases like LPG, Alcohol, Propane, Hydrogen, CO and even methane
  • Air quality monitor
  • Gas leak alarm
  • Safety standard maintenance
  • Maintaining environment standards in hospitals
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