Product details The MQ135 Air Quality Sensor Module uses a semiconductor gas-sensitive material (SnO₂) that changes conductivity based on the concentration of harmful gases in the air. As pollutant levels increase, the resistance of the sensor decreases, resulting in a varying analog voltage output proportional to air contamination. The module also integrates a comparator circuit with an adjustable potentiometer, enabling threshold-based triggers through a digital output signal. It includes LED indicators for power and gas alert notifications. The MQ135 is suitable for indoor air quality systems, smart ventilation devices, gas leak alerts, and environmental monitoring projects. It is compatible with microcontrollers such as Arduino, ESP32, ESP8266, STM, and Raspberry Pi.
