Description of MQ-8 Hydrogen Gas Sensor
MQ-8 is a Metal oxide semiconductor (MOS) type sensor from the series of MQ gas sensors (MQ-2, MQ-3, MQ-4, and so on). The module is highly sensitive to Hydrogen gas and can be used to detect any leaks or presence of Hydrogen gas in the air.
Features:
- Low Cost
- Fast Response
- Stable and Long Life
- High sensitivity to Hydrogen (H2)
- Small sensitivity to Alcohol, LGP and Cooking Fumes
- Both Analog and Digital outputs
- On-board LED indicator
Specifications:
- Operating Voltage : 5V ±0.1
- Detects H2 Gas concentration in air
- Resistant to LPG, smoke, alcohol
- Analog and digital output
- Pins: gold pin connectors of 2.54 mm raster
- Board sizes: 33 x 20 mm
- It has mounting holes with the diameter: 3 mm
Applications:
- Gas Leak Detection Systems: Monitors environments for hydrogen leaks, ensuring safety in residential, commercial, and industrial settings.
- Industrial Safety: Used in facilities where hydrogen is utilized or stored to detect leaks and prevent potential hazards.
- Environmental Monitoring: Assists in assessing air quality by detecting hydrogen concentrations in the atmosphere.
Pinout for MQ-8 Hydrogen Gas Sensor Module:
| Pin | Function | Description |
|---|---|---|
| VCC | Input Power Supply | Provides the power supply to the sensor (typically 5V). |
| GND | Supply Ground | Ground connection for the sensor module. |
| DO | Digital Output | Provides a digital output signal (high or low) depending on hydrogen gas concentration. |
| AO | Analog Output | Outputs a variable analog voltage that corresponds to the hydrogen gas concentration. |
The Digital Output D0
With the help of the potentiometer placed on the reverse side of the board, set is the threshold above which the output D0 is changed from a high to a low status. The output D0 can be linked directly witha microcontrolleror commissioning set, including Arduino, or for example, with a module of a buzzer which will signal too low or high level of gasesin the air.
Analog Output A0
The sensor has an analog output A0 which must be connected to the pin of the converter A/D (of analog input inArduino). This will allow you to measure the proportional voltage signal and more accurately determine the concentration.
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