Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | MQ-2 |
| Detection Gases | LPG, Propane, Hydrogen, Methane, Carbon Monoxide, Smoke |
| Operating Voltage | 5V DC |
| Output Signal | Digital Switch Output (0 and 1) & Analog Voltage Output |
| Preheat Time | 24-48 hours for stable readings |
| Sensitivity Adjustment | Adjustable via onboard potentiometer |
| Interface Type | 3-pin connector (VCC, GND, DO/AO) |
| PCB Dimensions | 32mm x 20mm x 15mm |
| Compatibility | Arduino, Raspberry Pi, STM32, ESP8266 |
| Package Contents | 1x MQ-2 Sensor Module, 1x Pin Header Strip |
Anonymous
Mar 31, 2026
Rating: 4/5
Easy to interface
Wiring was straightforward. The library support for Arduino is abundant. My only minor complaint is that the pin headers weren't soldered on, but that's standard for these modules.
Anonymous
Mar 29, 2026
Rating: 4/5
Good value but needs warm-up
Great little module for the price. Just remember it needs a long preheat time before the readings stabilize. Once warmed up, it detects smoke from a blown-out candle instantly.
Anonymous
Mar 28, 2026
Rating: 5/5
Perfect for my home safety project
This sensor works exactly as described. I integrated it with an Arduino to monitor my garage for gas leaks. The analog output is smooth and the digital threshold is easy to set with the screw.
Anonymous
Mar 19, 2026
Rating: 3/5
Works well after calibration
Took some trial and error to get the code right, but the hardware itself is solid. Make sure you read the datasheet regarding the heating element current requirements.
Anonymous
Mar 07, 2026
Rating: 5/5
Reliable and sensitive
I've tested this against a professional meter and the correlation is surprisingly good for a hobbyist component. Highly recommended for air quality monitoring prototypes.
Anonymous
Mar 05, 2026
Rating: 5/5
Essential for IoT projects
Using this in a smart home setup to trigger an exhaust fan when cooking fumes are detected. It responds quickly and the sensitivity adjustment allows me to fine-tune it perfectly.
Q: How long does the sensor last?
A: Under normal operating conditions, the sensing element typically lasts between 1 to 2 years depending on the concentration of gases it is exposed to.
Q: Does this come with a library for Arduino?
A: We do not provide a proprietary library, but there are many open-source libraries available in the Arduino Library Manager compatible with MQ-2 sensors.
Q: Does this module detect natural gas?
A: Yes, the MQ-2 is sensitive to methane, which is the primary component of natural gas, as well as LPG and propane.
Q: Is the output analog or digital?
A: It provides both. The AO pin gives an analog voltage proportional to gas concentration, and the DO pin gives a digital high/low signal when a threshold is crossed.
Q: Can I connect this directly to a 3.3V microcontroller?
A: The sensor heater requires 5V. While the logic output might work with 3.3V, we recommend using a level shifter or running the VCC at 5V for optimal performance.
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