MQ-7 Carbon Monoxide Sensor

Use this sensor to detect Carbon Monoxide (CO) concentrations.

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This Gas Sensor detects carbon monoxide concentrations in the air. An analog signal increases as the concentration of carbon monoxide gas increases in the air. This module also includes a digital output pin with TTL output. The Potentiometer on board is used to set the Digital Output Setpoint. 


  • Wide detecting scope
  • High sensitivity & stability
  • Simple drive circuit
  • Type: MQ-7
  • Detection Zone: 10 - 1000ppm
  • Sensitivity: ≥3%
  • Voltage in Clean Air: ≤1.5V
  • Load Resistance:10K (variable via onboard potentiometer)
  • Response Time:≤1s (pre-heating 3-5 minutes)
  • Recovery Time:≤30s
  • Heating Current:≤140mA
  • Heating Voltage:5.0V±0.2V
  • Heating Power: ≤700mW
  • Maximum Voltage:≤15V
  • Operating Conditions:
    • Ambient Temperature:-10℃~+50℃
    • Humidity:≤95%RH
  • Life expectancy: 5 years
  • Operating Voltage: 5V
  • Compatible with Arduino & Raspberry Pi
  • Pinout:
    • VCC: 5V
    • AOUT: Analog Output
    • DOUT: Digital Output
    • GND: 0V


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