Attributes

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

6 reviews

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.

5 FAQ

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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