Working Principle:

The MQ-7 is a Carbon Monoxide (CO) sensor suitable for sensing CO concentrations in the air. It can detect CO-gas concentrations anywhere from 20 to 2000 ppm.It make detection by method of cycle high and low temperature, and detect CO at low temperature.It is widely used in domestic CO gas leakage alarm, industrial CO gas alarm and portable CO gas detector.


Pin Configuration:


Vcc: 5v


A0: Analog pin (A0 to A5)

D0: Digitl pi(2 to 13)



  • Domestic CO gas leakage alarm,
  • Industrial CO gas alarm
  • Portable CO gas detector.




  • High sensitivity
  • fast response time


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