MQ4 Methane Natural Gas Sensor

MQ4 Methane Natural Gas Sensor 

The MQ-4 Gas Sensor is a semiconductor gas sensor designed to detect methane (CH?) and natural gas in the air. It uses a tin dioxide (SnO?) sensing element whose resistance changes when exposed to methane gas, enabling detection of gas concentration changes. The sensor includes an integrated heater that raises the sensing material to its optimal operating temperature and provides an analog output that varies with gas concentration. The MQ-4 is commonly used in basic gas detection systems, safety monitors, and embedded electronics projects.

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Features

• Sensitive to methane (CH?) and natural gas
• High sensitivity to target gases
• Provides an analog output proportional to gas concentration
• Requires integrated heater for stable operation
• Simple interfacing with microcontrollers (ADC input required)
• Compact size suitable for prototyping and embedded systems
• Long service life and low cost

Applications

• Methane/natural gas leak detection in homes, kitchens, and pipelines
• Gas leak alarms and safety monitoring systems
• Portable gas detection devices
• Environmental air quality sensing
• Industrial combustible gas monitoring systems
• Smart home automation gas alerts
• Educational and hobbyist electronics projects
• Embedded IoT gas sensing applications