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MQ-2 Smoke & Gas Detection Sensor Module
MQ-2 Smoke & Gas Detection Sensor Module
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The MQ-2 Gas Sensor Module detects smoke and several combustible gases such as LPG, propane, methane and hydrogen. It is ideal for Arduino, ESP32, gas detection prototypes, alarms, robotics and IoT projects.
Technical Specifications
| Specification | Details |
|---|---|
| Sensor Type | Semiconductor Gas Sensor |
| Sensor | MQ-2 |
| Detection | Smoke & Combustible Gases |
| Operating Voltage | Commonly 5V |
| Output | Analog / Digital* |
| Sensitivity | Adjustable on common modules |
| Warm-up | Requires preheating for stable readings |
| Interface | VCC, GND, AO, DO* |
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Key Features
Key Features
Detects smoke and combustible gases
Suitable for LPG detection projects
Can respond to methane, propane, hydrogen and other gases
Analog output
Digital threshold output on common modules
Adjustable sensitivity
Easy Arduino integration
Compatible with ESP32
Suitable for robotics and IoT projects
Applications
Applications
Smoke Detection Prototype
LPG Detection Prototype
Gas Alarm Prototype
Arduino Projects
ESP32 Projects
IoT Gas Monitoring
Smart Home Projects
Robotics
Automation
Safety Demonstration Projects
STEM Education
Engineering Projects
College Projects
Package Includes
Package Includes
1 × MQ-2 Gas Sensor Module
Compatibility
Compatibility
Frequently Asked Questions
Frequently Asked Questions
What gases can MQ-2 detect?
MQ-2 is commonly used to detect smoke and combustible gases including LPG, propane, methane and hydrogen.
Can I use MQ-2 with Arduino Uno?
Yes. The module can be connected to Arduino Uno for gas and smoke detection projects.
Can I use it with ESP32?
Yes, but check the module's output voltage before connecting it to an ESP32 ADC/GPIO because ESP32 inputs are not 5V tolerant.
Does MQ-2 give an exact gas concentration?
Not directly. Accurate concentration measurement requires proper calibration and consideration of the sensor's characteristics and environment.
Does it need warm-up time?
Yes. The sensor contains a heated sensing element and requires warm-up time for stable operation.
Can I make a gas leakage alarm with it?
You can build an educational/prototype alarm system, but this module should not replace a certified gas detector in a real safety-critical application.
Can MQ-2 detect only LPG?
No. It responds to multiple gases and smoke, so it should not be treated as an LPG-specific sensor.
