Below mentioned are some of the features and specifications of a Hydrogen gas sensor:

1. Operating Voltage: 5V DC
2. Detects H2 Gas concentration in air
3. Resistant to LPG, smoke, alcohol
4. Heater power consumption: < 800mW
5. Can detect H2 gas in the concentration range of 100 to 1000ppm

Pin Configuration of MQ-8 Hydrogen Gas Sensor

The MQ-8 gas sensor has 4 pins. The table below describes the pin type and the function of the specific pin.

Pin type	Pin Description
VCC	voltage input for Module(+5V)
GND	GROUND
DOUT	Digital Signal Output
AOUT	Analog Signal Output

Note: There are two different color modules of MQ-8 sensor modules whose pinouts are different;

Blue colored module: VCC, Ground, Dout, Aout

Black colored module: VCC, Aout, Dout, Ground

Usually, the pinouts are marked on the module, so be careful while connecting the sensor module to an MCU/MPU. The connections of the module can be followed from the section below.

Applications of MQ-8 Hydrogen Gas Sensor

Below are some of the applications for the MQ-8 gas sensor:

1. Detect leakages in the industry
2. Used in mines
3. Can be used in refrigerators and AC

Documentation

• MQ-8 Hydrogen Gas Sensor Pinout, Features, Datasheet, Working, Applications, Alternative (components101.com)