MQ135 Air Quality Sensor
The MQ135 Air Quality Sensor Module a low cost semiconductor sensor which can detect the presence of Ammonia (NH3), Mono-nitrogen oxides (NOx), Alcohol, Benzene, Smoke, Carbon-dioxide (CO 2) etc. It has good sensitivity to harmful gases in a wide range. The sensitive material used for this sensor is SnO2, whose conductivity is lower in clean air. It’s conductivity increases as the concentration of sensing gases increases. This module provides both digital and analog outputs. MQ135 Air Quality Sensor module can be easily interfaced with Micro controllers, Arduino Boards, Raspberry Pi etc.
Stable and Long Life
Good sensitivity to harmful gases in wide range
High sensitivity to Ammonia, Sulfide and Benzene
On-board LED indicator
Both digital and analog outputs