Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Type	MQ-2 Semiconductor Gas Sensor
Detectable Gases	LPG, Propane, Hydrogen, Methane, Alcohol, Smoke, CO
Operating Voltage	5V DC
Output Signal	Digital Switch Output (0 and 1) & Analog Voltage Output
Sensitivity Adjustment	Adjustable via onboard potentiometer
Response Time	< 10 seconds
Recovery Time	< 30 seconds
Interface	3-Pin Connector (VCC, GND, DO/AO)
PCB Dimensions	32mm x 20mm x 14mm
Compatibility	Arduino, Raspberry Pi, ESP32, STM32

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Perfect for home safety projects

I used this module to build a kitchen gas leak detector. The sensitivity adjustment works great, and it detects alcohol vapors instantly during testing. Very easy to interface with my Arduino Uno.

Anonymous

Mar 22, 2026

Rating: 4/5

Good value but needs calibration

The sensor works as advertised. You do need to let it warm up for about 24 hours initially for stable readings. Once calibrated, the digital output triggers reliably when smoke is present.

Anonymous

Mar 20, 2026

Rating: 4/5

Solid module for the price

Does exactly what the description says. The LED indicator on the board is helpful for visual debugging. My only minor complaint is that the pin headers were not included, but soldering them on was easy.

Anonymous

Mar 14, 2026

Rating: 4/5

Works well with ESP8266

Integrated this into my IoT setup. It sends alerts to my phone when gas levels rise. Just remember the operating voltage is 5V, so use a level shifter if connecting directly to 3.3V logic pins.

Anonymous

Mar 11, 2026

Rating: 5/5

Reliable and robust

Bought five of these for a university project on air quality monitoring. All units performed consistently. The analog output allows for granular data logging which was essential for our graphs.

Anonymous

Mar 09, 2026

Rating: 5/5

Excellent sensitivity

I was surprised by how quickly it reacted to lighter fluid fumes during a test. The potentiometer gives you full control over the threshold. Great component for learning about gas sensing.

5 FAQ

Q: Does this module come with a library for Arduino?

A: This is a hardware sensor module and does not include software. However, there are many open-source libraries available in the Arduino Library Manager (search for 'MQ2') that make reading the data very simple.

Q: Can it distinguish between different types of gas?

A: The MQ-2 is a general combustible gas sensor. It can detect the presence of various gases like LPG, hydrogen, and smoke, but it cannot specifically identify or distinguish which specific gas is causing the trigger without complex additional processing.

Q: What is the warm-up time required before accurate readings?

A: For best results, the sensor should be powered on for at least 24 hours initially to stabilize the internal heating element. After the initial burn-in, it typically requires 1-2 minutes of warm-up upon each power cycle.

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

A: The module operates at 5V. While the digital output often reads high enough for 3.3V logic, it is safest to use a voltage divider or a logic level converter for the analog and digital outputs to protect your 3.3V board.

Q: Can this sensor detect natural gas leaks in a home?

A: Yes, the MQ-2 sensor is sensitive to methane and other combustible gases found in natural gas. However, for critical life-safety applications, we recommend using certified industrial-grade detectors alongside DIY projects.

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