MQ135 Air Quality Gas Sensor Module

The MQ-135 Gas Sensor can identify dangerous gases and smoke, including ammonia (NH3), sulfur (S), benzene (C6H6), and CO2. This sensor, like the others in the MQ series of gas sensors, has a pin for both digital and analog output. The digital pin turns high when the amount of these gases in the air exceeds a predetermined threshold. The on-board potentiometer can be used to adjust this threshold value. An analog voltage that is produced by the analog output pin can be used to approximately determine the concentration of various gases in the atmosphere.

The MQ135 air quality sensor module requires about 150 mA and runs at 5 volts.Prior to producing reliable results, it needs to be heated up.

Specifications

•         Operating Voltage: 2.5V to 5.0V
•         Power consumption: 150mA
•         Detect/Measure: NH3, Nox, CO2, Alcohol, Benzene, Smoke
•         Detecting Range: 100ppm to 1000ppm
•         Typical operating Voltage: 5V
•         Digital Output: 0V to 5V (TTL Logic )
•         Analog Output: 0-5V
•         Module size: 40mmx30mmx35mm
•         Module Weight: 10g.