Description
Reviews
| 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 |
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.
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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