The MQ-2 Smoke Flammable Gas Sensor Module is a 32mm x 20mm x 21mm SnO2 semiconductor sensor detecting smoke, LPG, methane, propane, and general flammable gases, operating at 5V DC with a specified 20-second preheat duration. The mq2 gas sensor is the most popular and widely used member of the MQ-series — its broad multi-gas sensitivity makes it the default choice for general-purpose smoke and gas alarm projects across countless Arduino tutorials and beginner kits.
The mq2 sensor 20-second preheat duration is the per-power-on stabilisation time before readings become usable — this is shorter and more specific than the vaguer “few minutes” guidance for other MQ sensors, though like all MQ-series sensors, the initial first-use burn-in period (24-48 hours) still applies for full long-term stability. As a smoke and gas sensor, the mq2 smoke sensor analog output responds to particulate smoke as well as combustible gas vapors, making it suitable as a combined fire/smoke and gas leak early-warning sensor in one device. The smoke sensor reading increases with either smoke density or flammable gas concentration.
the mq2 gas sensor responds to both smoke and multiple gas types together, a single reading cannot distinguish whether a fire (smoke) or a gas leak triggered the alarm — for applications needing this distinction, a dedicated photoelectric smoke detector alongside this sensor may be needed. StemVolt provide, sensor is well-suited for engineers building general smoke and gas alarms and practical home safety electronics projects.
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Features:
- Detects smoke, LPG, methane, propane, and flammable gases combined
- 20-second preheat duration before usable readings — shorter than typical
- Most popular MQ-series sensor with extensive Arduino tutorial support
- Single analog output represents combined smoke/gas presence level
- Compact 32mm x 20mm x 21mm fits standard gas alarm enclosure designs
Technical Specifications:
 Applications:
- MQ-2 Sensor used for Arduino general smoke and gas alarm build
- Project uses mq2 gas sensor for smoke detection safety demo
- IoT monitor uses smoke and gas sensor for remote alarm logging
- Beginner kit uses mq2 smoke sensor for first Arduino gas project
Package Includes:
- 1 x MQ-2 Smoke Flammable Gas Sensor Module
Yuvraj Chouhan –
This sensor module provides reliable detection of smoke, LPG, methane, and other combustible gases, making it ideal for robotics projects and safety monitoring applications
Arun Vijay –
Secure payment gateway and responsive support team ensured a smooth purchase experience, while the sensor delivered stable and accurate gas detection performance
Priyansh Sharma –
Great experience overall
Rudrapratap Singh –
Quick shipping service
Manvendra Chaudhary –
Foam protected packaging
Devendra Jhanjhria –
Genuine quality product
Harshvardhan Gehlot –
Received this MQ-2 gas sensor in excellent condition, detection response was reliable and it worked perfectly for my robotics safety monitoring project.