This is sensor module based on MQ135 gas sensor uses in clean air low conductivity tin oxide (SnO2). It comes with basic components to enable the sensor to function properly and hook up easily to any controller that you preferred. When the sensor is kept in their environment, the conductivity in the sensor increases with the air pollution in gas concentration increases.
By using a simple circuitry converts the conductivity changes to analog voltage corresponding to the gas concentration. MQ135 Air Quality Sensor Module for ammonia, sulfide , benzene vapor high sensitivity of the smoke and other harmful monitor is also very good. This sensor can be used to measure a variety of harmful gases and also a low-cost sensors for a variety of applications .
