arduino › sensor module
generic MQ-135 Air-Quality Gas Sensor
Marketed as 'air quality' but it's a single MOX sensor that responds to many gases at once. Not a CO2 sensor. For CO2 use SCD41 or SCD30.
Specifications
- interface
- analog_or_digital
- voltage v
- 5v
- library arduino
- MQ135
- accuracy
- indicative ppm of NH3/NOx/CO2/alcohol
- range
- 10-1000ppm
- pin count
- 4
Sources
- SparkFun open product catalog · ingest 2026-05-06