This pin powers the module, typically the operating voltage is +5V
Used to connect the module to system ground
You can also use this sensor to get digital output from this pin, by setting a threshold value using the potentiometer
This pin outputs 0-5V analog voltage based on the intensity of the gas
Out of the two H pins, one pin is connected to supply and the other to the ground
The A pins and B pins are interchangeable. These pins will be tied to the Supply voltage.
The A pins and B pins are interchangeable. One pin will act as output while the other will be pulled to ground.