MQ2 Gas Sensor

Pin No:

Pin Name:

Description

For Module

1

Vcc

This pin powers the module, typically 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

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