MQ-2 Gas & Smoke Sensor Module
The MQ-2 Gas & Smoke Sensor Module provides a practical way to introduce gas and smoke sensing into electronics and embedded-system projects.
The module uses an MQ-2 semiconductor gas-sensing element based on tin dioxide (SnO₂). It is sensitive to a range of flammable gases and smoke, including gases such as LPG, propane, methane, hydrogen and alcohol vapours.
The sensor is useful for educational demonstrations where a microcontroller reads the sensor response and uses the detected change to trigger an indicator, buzzer, display or other programmed action.
It can be used in projects involving gas-leakage demonstrations, smoke detection experiments, environmental monitoring concepts, IoT projects and automated alert systems.
The MQ-2 is a general-purpose gas sensor rather than a selective gas analyzer. Its response can be affected by environmental conditions and sensor calibration. Therefore, the sensor output should not be interpreted as an exact gas concentration without an appropriate calibration process.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Gas & Smoke Sensor Module |
| Sensor Model | MQ-2 |
| Sensing Technology | Semiconductor Gas Sensor |
| Sensing Material | Tin Dioxide (SnO₂) |
| Primary Detection | Flammable Gases and Smoke |
| Detectable Gases / Vapours | LPG, i-Butane, Propane, Methane, Hydrogen, Alcohol and Smoke |
| Approximate Detection Range | 300–10,000 ppm for flammable gases under specified sensor conditions |
| Operating Voltage | Approx. 5V DC |
| Sensor Type | General-Purpose Gas Sensor |
| Typical Application | Gas and Smoke Detection Experiments |
| Interface | Sensor module output for microcontroller-based projects |
| Suitable Platforms | Arduino and other compatible microcontrollers |
| Quantity | 1 Module |
Technical Specification Pointer
MQ-2 SnO₂ semiconductor gas sensor designed for detecting flammable gases and smoke, with an approximate 300–10,000 ppm sensing range under specified conditions.
Key Features
- MQ-2 Gas Sensor: Uses the widely used MQ-2 semiconductor sensing element.
- Multi-Gas Sensitivity: Responds to several flammable gases and vapours rather than only one gas.
- Smoke Detection: Suitable for experimental smoke-detection applications.
- SnO₂ Sensing Element: Uses tin dioxide as the gas-sensitive material.
- Microcontroller Projects: Suitable for integration into Arduino and other embedded projects.
- IoT Applications: Can be incorporated into connected environmental-monitoring projects.
- Threshold-Based Projects: Useful for triggering alerts or actions when sensor response crosses a programmed threshold.
- Educational Use: Suitable for learning about gas sensing, analog signals and sensor-based automation.
Recommended Applications
- Gas detection experiments
- Smoke detection projects
- LPG detection demonstrations
- Methane detection experiments
- Flammable-gas sensing projects
- Environmental monitoring concepts
- Arduino sensor projects
- IoT monitoring systems
- Automatic alert projects
- Embedded-system experiments
- STEM education projects
- DIY electronics projects
Educational Applications
The MQ-2 can be used to demonstrate:
- Semiconductor gas sensing
- Sensor response characteristics
- Analog sensor data
- Threshold detection
- Microcontroller-based monitoring
- Gas and smoke detection concepts
- Sensor calibration concepts
- Automated warning systems
- IoT environmental monitoring
Project Possibilities
- Gas-leak detection demonstration
- Smoke-alert project
- Arduino gas-sensing system
- IoT gas-monitoring prototype
- Automatic buzzer alert
- Gas-sensing data logger
- Environmental monitoring experiment
- Multi-sensor safety demonstration
- Microcontroller-based threshold alarm
Compatibility Notes
The MQ-2 module can be integrated into projects using Arduino and other compatible microcontrollers.
The sensor output represents the sensor’s response to detected gases and environmental conditions. It should not be treated as a directly calibrated PPM measurement unless the complete system has been properly calibrated.
What’s Included
- 1 × MQ-2 Gas & Smoke Sensor Module
Important Notes
- The MQ-2 is a general-purpose gas sensor, not a selective gas analyzer.
- Sensor response varies depending on gas type, concentration, temperature, humidity and other environmental conditions.
- The stated sensing range should not be interpreted as guaranteed measurement accuracy across all gases and conditions.
- Proper calibration is required when quantitative gas-concentration measurements are needed.
- This product is intended for educational, hobby and prototyping applications.
- It is not a certified life-safety gas alarm or professional gas-monitoring instrument.
- Allow appropriate sensor warm-up and operating conditions before taking readings.
- Do not use this module as the sole protection against hazardous gas exposure.
Product Summary
The MQ-2 Gas & Smoke Sensor Module is a versatile semiconductor gas sensor for detecting changes associated with flammable gases and smoke. With sensitivity to gases including LPG, methane, propane, hydrogen and alcohol vapours, it is well suited to Arduino, IoT, embedded-system and STEM projects involving gas sensing, monitoring and automated alerts.
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