The MQ-5 gas sensor is a versatile and cost-effective device used for detecting various combustible gases, including LPG, methane, and propane.
Key Features and Specifications
Sensing Material: The MQ5 sensor uses tin dioxide (SnO2) as its sensing material, which has low conductivity in clean air. The conductivity increases in the presence of combustible gases, allowing the sensor to detect their concentration.
Gas Sensitivity: The MQ-5 sensor is particularly sensitive to:
Propane (C3H8): Highest sensitivity, ideal for propane leak detection.
Methane (CH4): Moderate sensitivity, but not as precise as dedicated methane sensors.
Butane (C4H10): Can detect butane, especially in LPG mixtures.
Alcohol (C2H5OH): Limited sensitivity, not suitable for precise alcohol measurements.
Working Principle
The MQ5 sensor operates on the principle of chemiresistance. When combustible gases come into contact with the sensor, the change in gas concentration alters the resistance of the tin dioxide material. This change is converted into a voltage signal, which can be read by microcontrollers or other electronic devices.
Applications
Gas Leak Detection: Commonly used in household and industrial applications to detect leaks of LPG, natural gas, and other combustible gases.
Safety Systems: Integrated into safety systems to prevent gas-related accidents by providing early warnings of gas leaks.
Environmental Monitoring: Used in projects that require monitoring of air quality and gas concentrations.
Interfacing with Microcontrollers
The MQ5 sensor can be easily interfaced with microcontrollers like Arduino. It typically has four pins: two for power (VCC and GND) and two for analog and digital output. The sensitivity can be adjusted using a potentiometer on the module.
Conclusion
The MQ5 gas sensor is a reliable and economical choice for detecting various combustible gases. Its ease of use and adaptability make it suitable for a wide range of applications, from home safety systems to environmental monitoring projects. For detailed specifications and interfacing instructions, refer to the datasheets and guides available online.
