The MQ 135 Air Quality Detector Sensor Module for Arduino has lower conductivity in clean air. When the target combustible gas exists, the conductivity of the sensor is higher along with the gas concentration rising. Convert change of conductivity to the corresponding output signal of gas concentration. The MQ135 gas sensor has a high sensitivity to Ammonia, Sulphide and Benzene steam, also sensitive to smoke and other harmful gases. Well, detecting air quality is getting more important as we need to take care of the only Earth that we have. And with the increasing air and environmental pollution, this MQ135 Air Quality Sensor Module will be a good assistant and provide useful information about the surrounding air.

MQ-135 Sensor Features

• Wide detecting scope
• Fast response and High sensitivity
• Stable and long life
• Operating Voltage is +5V
• Detect/Measure NH3, NOx, alcohol, Benzene, smoke, CO2, etc.
• Analog output voltage: 0V to 5V
• Digital output voltage: 0V or 5V (TTL Logic)
• Preheat duration 20 seconds
• Can be used as a Digital or analog sensor
• The Sensitivity of Digital pin can be varied using the potentiometer