Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	5V DC
Detection Gases	LPG, Propane, Hydrogen, Methane, Alcohol, Smoke
Output Signal	Digital Switch Output (0 and 1) & Analog Output
Heater Current	Approx. 150mA
Preheat Time	24-48 Hours for stable readings
Sensitivity Adjustment	Adjustable via onboard potentiometer
Interface Type	3-Pin Header (VCC, GND, DO/AO)
PCB Dimensions	32mm x 20mm x 14mm
Material	FR-4 PCB with Tin Plating
Compatibility	Arduino, Raspberry Pi, ESP32, STM32

6 reviews

Anonymous

Mar 21, 2026

Rating: 5/5

Reliable analog and digital output

I appreciate having both analog and digital outputs on one board. It allows for flexible integration into my IoT gateway. The response time to combustible gases is impressively fast.

Anonymous

Mar 19, 2026

Rating: 4/5

Good value but needs patience

The module is solid and well-soldered. Just remember that it needs a long preheat time (about 24 hours) before the readings stabilize. Once warmed up, it detects alcohol and gas very reliably.

Anonymous

Mar 16, 2026

Rating: 3/5

Works well but gets hot

The sensor functions correctly and detects methane effectively. However, the heating element gets quite hot during operation, so ensure you have adequate ventilation in your enclosure.

Anonymous

Mar 09, 2026

Rating: 4/5

Great for learning electronics

Used this for my university final year project on air quality monitoring. Documentation online is plentiful, and the sensor behaves consistently. Deducting one star because the header pins were slightly loose upon arrival.

Anonymous

Mar 04, 2026

Rating: 5/5

Perfect for my home safety project

This sensor works exactly as described. I connected it to an Arduino Uno and had it detecting smoke within minutes after the initial preheat. The sensitivity pot makes it easy to calibrate for different environments.

Anonymous

Mar 03, 2026

Rating: 5/5

Sensitive and adjustable

The ability to adjust the threshold with the screwdriver is a huge plus. I set it to trigger only when smoke levels are genuinely concerning, avoiding false alarms from cooking steam.

5 FAQ

Q: How do I calibrate the sensitivity threshold?

A: Use a small Phillips head screwdriver to turn the blue potentiometer on the board. Turn it clockwise to increase sensitivity (trigger easier) or counter-clockwise to decrease it. Test with a safe amount of target gas to find your sweet spot.

Q: What is the recommended preheat time before first use?

A: We recommend powering the sensor for at least 24 to 48 hours before relying on its readings. This burns off any manufacturing residues and stabilizes the internal heating element.

Q: Can this detect carbon monoxide specifically?

A: The MQ-2 is primarily sensitive to LPG, propane, hydrogen, methane, alcohol, and smoke. While it may react to Carbon Monoxide, the MQ-7 sensor is specifically designed and calibrated for accurate CO detection.

Q: Does this module require an external library to work with Arduino?

A: No external library is strictly necessary. You can read the digital output using a standard digitalRead() function and the analog output using analogRead(). Libraries are available if you want advanced calibration features.

Q: Is the output voltage compatible with 3.3V systems like ESP32?

A: Yes, the digital output can work with 3.3V logic, but for the best stability and analog reading accuracy, we recommend using a level shifter or powering the VCC at 5V while connecting the signal pin to the 3.3V MCU input.

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