MQ-135 Gas Sensor

About this item:-

• Input voltage: Dc5v power (current): 150ma
• Analog output with increasing concentration, the higher the concentration, the higher the voltage
• A hazardous gas detection apparatus for the family, the environment. Suitable for ammonia, aromatic compounds, sulfur, benzene vapor, smoke and other gases harmful gas detection. Gas-sensitive element test concentration range: 10 to 1000 ppm
• TTL output valid signal is low level, (output low signal light, which can be accessed microcontroller io port)
• Size: 36 mm x 24 mm x 25 mm(l x w x h), package contents: 1 x mq-135 air quality sensor
• Power: 2.5V ~ 5.0V
• Detecting Range: 10ppm-300ppm NH3 ,10ppm-1000ppm Benzene,10ppm-300ppm Alcohol
• Relative humidity:<95%RH
• Dimension: 40.0mm * 21.0mm

Hazardous Gas Detection Module If you want to detect different types of gases, you will need sensors. If you need any data on the sensitive material then, the Waves are MQ-135 Gas Sensor is a quite good solution.

The MQ-135 sensor is a  gas sensor module that incorporates MQ-135, designed for air quality monitoring. It can be used to measure benzene, alcohol, smoke, then generate digital signals for triggering air treatment devices. The MQ-135 is used in Air quality Monitor in consumer and industry applications, this sensor is suitable for detecting benzene, alcohol, smoke. Avoid the noise of LPG, natural gas, coal gas. The sensitivity can be adjusted by the potentiometer.MQ-135 gas sensor applies SnO2 which has lower conductivity in the clear air as a gas-sensing material. In an atmosphere where there may be polluting gas, the conductivity of the gas sensor raises along with the concentration of the polluting gas increases 
The sensitive materials of the MQ-135 gas sensor are benzene, alcohol, and smoke. When the target combustible gas exists, The sensor’s conductivity is higher along with the gas concentration rising. Please use a simple electro circuit, Convert the change of conductivity to the corresponding output signal of gas concentration.

Connections:-

VCC ↔ 2.5V ~ 5.0V

GND ↔ power supply ground

AOUT ↔ MCU.IO (analog output)

DOUT ↔ MCU.IO (digital output)