Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | MQ-2 |
| Detection Gases | LPG, Propane, Hydrogen, Smoke |
| Operating Voltage | 5V DC |
| Output Signal | Digital (DO) and Analog (AO) |
| Interface Type | 3-Pin Header (VCC, GND, OUT) |
| Compatibility | Arduino Uno R3, Mega, Nano, Raspberry Pi |
| Protection Feature | Reverse Connection Protection |
| Adjustable Sensitivity | Yes, via onboard potentiometer |
| Preheat Time | Approx. 24 hours for stable readings |
| Package Contents | 1x MQ-2 Sensor Module, 1x Pin Header Strip |
Anonymous
Mar 26, 2026
Rating: 5/5
Easy integration
Integrated this into my smart home system without issues. The analog output allows for precise monitoring of gas concentration levels, not just a binary alarm.
Anonymous
Mar 25, 2026
Rating: 4/5
Works as described
Found plenty of libraries online to get this running quickly. The digital output threshold is easy to set with the small screw on the board. Solid component.
Anonymous
Mar 23, 2026
Rating: 5/5
Perfect for my home safety project
This sensor works flawlessly with my Arduino Uno. The reverse connection protection gave me peace of mind while wiring it up for the first time. Detection is quick and the sensitivity adjustment is very responsive.
Anonymous
Mar 14, 2026
Rating: 4/5
Great value, needs warm-up
Good quality module for the price. Just remember to let it preheat for a day before calibrating, otherwise the readings drift. Once settled, it detects smoke from a match instantly.
Anonymous
Mar 12, 2026
Rating: 5/5
Sensitive and accurate
Tested against a commercial detector and this module triggered at similar levels. Excellent for prototyping fire alarm systems. Shipping was fast too.
Anonymous
Mar 08, 2026
Rating: 5/5
Reliable for classroom kits
We bought ten of these for our robotics club. They are durable and the pin layout makes breadboarding easy. No failures so far after three months of student use.
Q: Can this detect natural gas leaks specifically?
A: The MQ-2 is primarily sensitive to LPG, propane, and hydrogen. While it may react to natural gas (methane), the MQ-5 or MQ-6 models are optimized specifically for methane and natural gas detection.
Q: What is the purpose of the reverse connection protection?
A: This feature prevents damage to the sensor module if you accidentally swap the VCC and GND wires during installation. It adds an extra layer of durability for beginners.
Q: Does this module work with 3.3V logic boards like the ESP32?
A: Yes, but since the module operates at 5V, you may need a logic level converter for the signal pins if your board is strictly 3.3V tolerant. The VCC should generally remain at 5V for the heater element.
Q: Is the pin header included in the package?
A: Yes, the package includes a strip of 3-pin headers that you can solder onto the module for easy breadboard usage.
Q: How long does the sensor need to preheat before use?
A: For initial stabilization, we recommend powering the sensor for 24 to 48 hours. After the initial burn-in, it typically only requires a few minutes of warm-up time upon subsequent power cycles.
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