Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Type	MQ-2 Semiconductor Gas Sensor
Detectable Gases	LPG, Propane, Hydrogen, Methane, Alcohol, Smoke
Operating Voltage	5V DC
Output Signal	Digital Switch Output (0 and 1) & Analog Voltage Output
Preheat Time	24-48 Hours (Initial)
Concentration Range	300 - 10000 ppm for combustible gases
Interface	3-Pin Header (VCC, GND, DO/AO)
Adjustability	Sensitivity adjustable via onboard potentiometer
Compatible Boards	Arduino, Raspberry Pi, ESP8266, STM32
Dimensions	32mm x 20mm x 15mm

6 reviews

Anonymous

Mar 30, 2026

Rating: 4/5

Good value but needs patience

The module works as described. Just remember that it takes a while to stabilize when you first plug it in. Don't expect instant readings on day one. Great price for the functionality.

Anonymous

Mar 28, 2026

Rating: 5/5

Perfect for home safety projects

I used this sensor to build a custom kitchen gas leak alarm. It was very easy to interface with my Arduino Uno. The sensitivity adjustment works well once you let it preheat for the recommended time.

Anonymous

Mar 28, 2026

Rating: 5/5

Excellent sensitivity

I integrated this into my smart home system using an ESP32. It detects LPG leaks very quickly. The build quality feels sturdy and the pins are well-soldered.

Anonymous

Mar 21, 2026

Rating: 5/5

Reliable for student projects

Bought ten of these for our university robotics club. All units performed consistently. The analog output allows for precise monitoring of gas concentration levels in our test chambers.

Anonymous

Mar 14, 2026

Rating: 3/5

Works but documentation could be better

The hardware is fine, but I had to search online for good code examples to get the analog readings calibrated correctly. Once figured out, it does the job well.

Anonymous

Mar 07, 2026

Rating: 4/5

Solid sensor module

Works great for detecting smoke from incense during testing. The digital output threshold is easy to set with the small screw on the board. Would recommend having a multimeter handy for calibration.

5 FAQ

Q: What is the lifespan of the sensing element?

A: Under normal operating conditions, the MQ-2 sensing element typically has a lifespan of 1 to 2 years. Exposure to extremely high concentrations of gas or silicone vapors can shorten this life.

Q: Is the output voltage 3.3V or 5V compatible?

A: The module operates at 5V. The digital output is 5V logic. If you are using a 3.3V microcontroller like an ESP8266 or ESP32, you may need a voltage divider or level shifter for the digital pin, though the analog pin often reads fine directly.

Q: Does this module require a separate library for Arduino?

A: No specific library is required. You can read the digital output using standard digitalRead() functions and the analog output using analogRead(). Many generic gas sensor libraries exist if you want advanced filtering.

Q: How long does the sensor need to warm up before use?

A: For initial use, the sensor should be powered on for 24 to 48 hours to burn off manufacturing residues and stabilize. After the initial burn-in, a warm-up time of about 1-2 minutes is usually sufficient for subsequent uses.

Q: Can this detect carbon monoxide (CO)?

A: The MQ-2 is primarily designed for combustible gases like LPG, propane, and methane, as well as smoke. For dedicated Carbon Monoxide detection, we recommend the MQ-7 sensor module instead.

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