arduino › sensor module
generic MQ-7 Carbon Monoxide Sensor
Requires a duty-cycled heater (5V/1.4V at 60s/90s) to read CO correctly. Wiring it to a fixed 5V will return junk numbers — don't ship a CO alarm built on it.
Specifications
- interface
- analog
- voltage v
- 5v
- library arduino
- none (analogRead)
- accuracy
- 10-500ppm CO
- range
- see accuracy
- pin count
- 4
Sources
- SparkFun open product catalog · ingest 2026-05-06