MQ-2 Combustible Gas and Smoke Sensor Module
Dual-Purpose Gas Detection for Arduino and DIY Projects
The MQ2 gas sensor module is a lowcost, semiconductor-based device designed for detecting combustible gases including LPG, propane, hydrogen, methane, and smoke. It is widely used in gas leak alarms, fire/smoke detectors, and air quality monitoring systems .
MultiGas Detection Sensitive to LPG, propane, hydrogen, methane, and smoke with detection range of 300-10,000 ppm .
Simple Interface - Provides both analog and digital output signals for easy integration with microcontrollers .
Operating voltage is 5V DC, with heater power consumption of ~750-900mW .
For stable readings, allow the sensor to preheat for several minutes .
The sensor requires calibration in clean air to establish the baseline R0 value for accurate ppm estimation .
Technical Specifications
| Parameter | Value |
|---|
| Target Gases | LPG, Propane, Hydrogen, Methane, Smoke |
| Detection Range | 300-10,000 ppm (varies by gas) |
| Operating Voltage | 5V DC |
| Heater Voltage | 5.0V ± 0.2V |
| Heater Resistance | 33Ω ± 5% |
| Heater Consumption | ~800mW |
| Response/Recovery Time | <10s |
| Output Signal | 0-5V Analog (AO) & TTL Digital (DO) |
| Preheat Time | Several minutes (up to 24-48 hrs) |
= Key Features =
+High Sensitivity to Combustible Gases - Responds to a wide range of gases .
+Fast Response and Recovery - <10 seconds response time .
+Adjustable Sensitivity Builtin potentiometer for digital output threshold .
+Low Cost Budgetfriendly for DIY and educational projects .
= Applications =
- Home and industrial gas leak detection .
- Combustible gas alarms for kitchens and labs .
- Air quality and fire/smoke monitoring .
- IoT environmental sensing projects .
Versatile Detection - A popular starter sensor for safety and environmental projects
Wide Compatibility - Works with Arduino, ESP32, and other 5V logic systems
√ On-board power and signal indicators .
√ 4 mounting holes for secure installation .
