MQ-7 CO Gas Sensor

The MQ-7 sensor is a carbon monoxide (CO) gas detection sensor used to detect harmful CO gas in air. It works using a tin dioxide (SnO₂) semiconductor sensing material whose electrical resistance changes when exposed to CO gas.

It is commonly used in gas leakage detection systems, air quality monitoring, and IoT safety projects.

• Gas detected: Carbon Monoxide (CO)
• Detection range: 10 – 1000 ppm (approx.)
• Operating voltage: 5V DC
• Heater current: ~150 mA
• Warm-up time: 24–48 hours (first use recommended)
• Output types:
  • Analog output (AO)
  • Digital output (DO via comparator)