This is an MQ8 hydrogen gas sensor. It has high sensitivity to Hydrogen (H2) and less sensitivity to alcohol, LPG,cooking fumes . Hydrogen gas is highly flammable and will burn in air at a very wide range of concentrations

The sensitivity is able to be adjusted by the potentiometer.  The output is proportional to the density of gas. You can use analog reading to read the data from this sensor.
 

To ease the difficulty of using this sensor,  a Gravity Interface is adapted to allow plug&play.  The Arduino IO expansion shield is the best match for this senor connecting to your Arduino microcontroller.


What is Hydrogen?  Hydrogen is a chemical element with chemical symbol H and atomic number 1.

SPECIFICATION

    Power supply needs: 5V
    Interface type: Analog
    Pin Definition:  1-Output  2-GND  3-VCC
    High sensitivity to Hydrogen (H2)
    Small sensitivity to alcohol, LPG,cooking fumes
    Stable and long life
    Size: 40x20mm(1.57"x0.79")

FEATURES
* High sensitivity to Hydrogen (H2)
* Small sensitivity to alcohol, LPG,cooking fumes
* Stable and long life             

APPLICATION    
They are used in gas leakage detecting equipments in family and industry, are suitable for detecting of Hydrogen (H2), avoid the noise of alcohol and cooking fumes, LPG,CO.

DOCUMENTS

    MQ8 datasheet