The MQ-135 Air Quality Sensor Module detects gases such as ammonia (NH3), nitrogen oxides, benzene, smoke and CO2 levels.
The MQ-135 Air Quality Sensor Module detects gases such as ammonia (NH3), nitrogen oxides, benzene, smoke and CO2 levels. It is used to build air quality monitors that show whether indoor air is clean or polluted, with analog and digital outputs.
| Sensor | MQ-135 |
|---|---|
| Detects | NH3, NOx, benzene, smoke, CO2 (indicative) |
| Range | 10 – 1000 ppm |
| Supply voltage | 5V |
| Output | Analog (AO) + Digital (DO) |
| Adjustment | Potentiometer for threshold |
What is the operating voltage?
5V.
Can it measure exact CO2 ppm?
It gives an indication only; for accurate CO2 use an NDIR sensor like MH-Z19.
Can I buy the MQ 135 Air Quality/Gas Detector Sensor Module For Arduino in Kanpur?
Yes – buy online with delivery across India, or pick it up from the iTechBuilders store, Damodar Nagar, Kanpur.
