Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | MQ-2/135/3/7/9 |
| Detection Gases | Smoke, Alcohol, Hydrogen, CO, LPG, Propane |
| Operating Voltage | 5V DC |
| Interface Type | Analog and Digital Output |
| Heater Voltage | 5.0V ± 0.2V |
| Load Resistance | Adjustable via Potentiometer |
| Preheat Time | 24-48 Hours |
| Working Temperature | -10°C to 50°C |
| Humidity Range | Less than 95% RH |
| Compatibility | Arduino, Raspberry Pi, STM32 |
Anonymous
Mar 23, 2026
Rating: 5/5
Works well in automation setups
Integrated this into my greenhouse monitoring system to detect any faulty heating equipment. It has been running for two months without issues. The sensitivity to carbon monoxide is a great feature.
Anonymous
Mar 14, 2026
Rating: 4/5
Great for learning embedded systems
Excellent component for students and makers. The documentation online is plentiful. My only minor complaint is that the pins are a bit close together, so careful soldering is required if you want to add headers.
Anonymous
Mar 12, 2026
Rating: 5/5
Reliable gas detection
I used this for a prototype gas leak detector. The digital output threshold is easily adjustable with the onboard potentiometer. It triggered my alarm system reliably during testing with lighter fluid vapor.
Anonymous
Mar 11, 2026
Rating: 5/5
Perfect for my home safety project
This sensor module works exactly as described. I connected it to my Arduino Uno and was able to detect smoke and alcohol vapors within minutes after the preheat cycle. The analog output is stable and easy to calibrate.
Anonymous
Mar 11, 2026
Rating: 4/5
Good value but needs patience
The sensor is sensitive and responsive. Just remember that it requires a long preheat time (about 24 hours) before giving accurate readings. Once warmed up, it detects combustible gases very well.
Anonymous
Mar 09, 2026
Rating: 3/5
Decent but power hungry
The sensor functions correctly, but the internal heater draws quite a bit of current. Make sure your power supply can handle at least 150mA continuously. Otherwise, it performs as expected for the price.
Q: Can this detect natural gas leaks specifically?
A: Yes, the MQ-2 sensor is sensitive to liquefied petroleum gas (LPG), propane, and methane, which are common components of natural gas.
Q: How do I adjust the sensitivity threshold?
A: There is a blue potentiometer on the board. Turn it clockwise to increase sensitivity (lower threshold) or counter-clockwise to decrease sensitivity.
Q: What is the recommended preheat time before first use?
A: We recommend a preheat time of 24 to 48 hours for the sensor to stabilize and provide accurate baseline readings.
Q: Does this module come with header pins soldered?
A: No, the module typically comes without header pins soldered to allow for flexible mounting options. You will need to solder them yourself if required.
Q: Is the output signal 3.3V or 5V compatible?
A: The module operates on 5V. While the analog output can be read by 3.3V microcontrollers, ensure the voltage levels are compatible or use a voltage divider to protect 3.3V logic inputs.
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