MQ-135 Air Quality Gas Sensor Module

MQ-135 Air Quality Gas Sensor Module
Features:

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

Pinouts:

Pin Configuration:

Pin No:
Pin Name:
Description

For Module

1
Vcc
Used to power the sensor, Generally the operating voltage is +5V.

2
Ground
Used to connect the module to system ground.

3
Digital Out
You can also use this sensor to get digital output from this pin, by setting a threshold value using the potentiometer.

4
Analog Out
This pin outputs 0-5V analog voltage based on the intensity of the gas.

For Sensor

1
H -Pins
Out of the two H pins, one pin is connected to supply and the other to ground

2
A-Pins
The A pins and B pins are interchangeable. These pins will be tied to the Supply voltage.

3
B-Pins

A pins and B pins are interchangeable. One pin will act as output while the other will be pulled to ground.