MQ135 Sensor

The MQ135 Air Quality Gas Sensor Module is a semiconductor sensor used for detecting harmful gases and pollutants in the air. It utilizes a tin dioxide (SnO2) layer as its sensing material, which exhibits lower conductivity in clean air. As the concentration of target gases increases, the conductivity rises along with the gas concentration. This module is highly sensitive to Ammonia (NH3), Sulfide, Benzene steam, and smoke, making it an excellent choice for air quality control applications. It features a simple drive circuit, fast response time, and long operational life. The sensor operates at a standard voltage of 5V and provides both analog and digital outputs for easy integration with microcontrollers like Arduino, ESP32, and Raspberry Pi. Whether you are building a home automation system or an industrial safety monitor, the MQ135 offers reliable performance and stability. Choose this sensor for its wide detection scope and proven reliability in various environmental monitoring projects.