MQ2 Flammable Gas and Smoke Sensor Module

MQ2 Flammable Gas and Smoke Sensor Module 

The MQ-2 Gas Sensor Module is a low-cost semiconductor gas sensor board designed to detect flammable gases and smoke in the air. It uses a tin dioxide (SnO?) sensing element whose electrical resistance changes when exposed to target gases such as LPG, propane, hydrogen, methane, and smoke. The module includes a built-in heater to bring the sensing element to its optimal operating temperature and provides an analog output (and often a digital output) for easy interfacing with microcontrollers such as Arduino, ESP32, or Raspberry Pi (with an ADC). The MQ-2 is widely used in gas leak detection and basic air quality monitoring projects.

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Features

• Detects flammable gases (LPG, propane, methane, hydrogen) and smoke
• High sensitivity to target gases
• Analog output proportional to gas concentration
• Often includes a digital (threshold) output with adjustable sensitivity
• Integrated heater for stable sensor operation
• Fast response and recovery
• Easy to interface with microcontrollers (ADC required)
• Compact and low-cost module suitable for prototyping and embedded systems

Typical Applications

• Gas leak detection in homes, kitchens, and industrial environments
• Smoke detection systems and basic fire alarms
• Portable gas and smoke detector devices
• Environmental air quality monitoring
• Smart home automation with gas/smoke alerts
• Safety systems in workshops and garages
• Educational and hobbyist electronics projects
• Embedded IoT sensor applications