MQ-135 Air Quality/Gas Detector Sensor

Features: sensitivity to ammonia, sulfide, and gasoline vapor with output signal instructions. TTL output signal is a low level. Analog 0 ~ 5 volt output voltage, the higher the concentration, the higher the voltage. The color shows the images. Sensitive to gasoline, alcohol, and smoke. Fast response and recovery. Adjustable sensitivity. Signal output indicator. Enhances the output voltage with increasing concentration of measured gases. The MQ-135 air quality sensor module for Arduino features a lower connection in clean air. When the target combustible gas is present, the sensor's conductivity is higher with increased gas concentration. Converts the change in conductivity into a corresponding output signal for gas concentration. The MQ-135 gas sensor has high sensitivity to ammonia, sulfide, and gasoline vapor, and is also sensitive to smoke and other harmful gases. It is low-cost and suitable for various applications such as harmful gases / smoke detection.