MQ-135 Air Quality Gas Sensor Module

Sensitive for benzene, alcohol, smoke

Output voltage boosts along with the concentration of the measured gases increases

Fast response and recovery

• Adjustable sensitivity
• Signal output indicator

Pin Configuration:

• Pin No:
• Pin Name:
• Description

For Module

• Vcc - Used to power the sensor, Generally the operating voltage is +5V.
• Ground - Used to connect the module to system ground.
• Digital Out - You can also use this sensor to get digital output from this pin, by setting a threshold value using the potentiometer.
• Analog Out - This pin outputs 0-5V analog voltage based on the intensity of the gas.

For Sensor

• H-Pins - Out of the two H pins, one pin is connected to supply and the other to ground
• A-Pins - The A pins and B pins are interchangeable. These pins will be tied to the Supply voltage.
• B-Pins - A pins and B pins are interchangeable. One pin will act as output while the other will be pulled to ground.

Wide detecting scope

Fast response and High sensitivity

Stable and long life

Operating Voltage : +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