The gas sensor module MQ-8 is designed to detect levels of hydrogen gas (H2) in the environment. The MQ-8 sensor is commonly used in applications such as gas leak detection, hydrogen gas monitoring in industrial settings, and hydrogen fuel cell monitoring.
The gas sensor is mounted on the PCB with TTL pins which makes it very easy to use it with controllers like Arduino, Raspberry PI, ESP, etc. with the simple help of jumper wires.
Here are some key points about the MQ-8 module:
- Gas Sensing Principle: The MQ-8 module utilizes a semiconductor-based gas sensor that reacts to the presence of hydrogen gas. The sensor’s resistance changes when it comes into contact with hydrogen gas, allowing the module to detect and measure its concentration.
- Operating Voltage: The module typically operates at a specific voltage, commonly 5V, which is supplied through the module’s power pins.
- Analog Output: The MQ-8 module provides an analog output signal that varies based on the concentration of hydrogen gas detected. This analog output can be connected to an analog-to-digital converter (ADC) or microcontroller to measure and interpret the gas concentration.
- Preheat Time: Similar to other gas sensor modules, the MQ-8 module requires a preheat time to stabilize the sensor before accurate readings can be obtained. This preheat time is typically a few minutes and may vary depending on the specific module and environmental conditions.
- Sensitivity and Range: The MQ-8 module has a specific sensitivity to hydrogen gas, and its detection range typically varies from a few parts per million (ppm) up to several hundred parts per million. The sensitivity and range specifications can be found in the module’s datasheet.
- Calibration: To ensure accurate measurements, the MQ-8 module may require calibration. This calibration process involves exposing the sensor to a known concentration of hydrogen gas and adjusting the measurement accordingly.