A
Anonymous
Feb 27, 2026
Rating: 5/5
Reliable sensor
Used in multiple prototypes. Consistent performance across batches. Good value.
Description
MQ-2 MQ2 Semiconductor Flammable Gas and Smoke Sensor Gas Detector
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Sensor Type | Metal Oxide Semiconductor (MOS) |
| Detectable Gases | LPG, i-Butane, Propane, Methane, Alcohol, Hydrogen, Smoke |
| Operating Voltage | 5V DC |
| Output Signal | Digital Switching (0/1) and Analog Voltage |
| Preheat Time | 24-48 Hours (Initial), 1-2 Minutes (Continuous) |
| Operating Temperature | -10°C to 50°C |
| Humidity Range | Less than 95% Relative Humidity |
| Module Dimensions | 32mm x 20mm x 14mm |
| Pin Interface | 4-Pin Header (VCC, GND, DO, AO) |
| Compatibility | Arduino, Raspberry Pi, ESP8266, STM32 |
5 reviews
A
Anonymous
Feb 23, 2026
Rating: 5/5
Perfect for learning
Easy to connect and read values. Great for school projects and understanding gas sensing basics.
A
Anonymous
Feb 13, 2026
Rating: 4/5
Works as expected
Sensitivity is adjustable via the potentiometer. Needs warm up time before stable readings.
A
Anonymous
Feb 09, 2026
Rating: 3/5
Calibration needed
Took some time to get the threshold right. Otherwise okay for the price point.
A
Anonymous
Jan 22, 2026
Rating: 5/5
Good quality module
PCB looks solid. Soldering is clean. Fast detection response for prototyping purposes.
5 FAQ
Q: Can I read this with Python?
A: Yes, if used with a Raspberry Pi or similar SBC via GPIO pins using Python libraries.
Q: How many pins are there?
A: There are 4 pins: VCC, GND, Digital Out, and Analog Out.
Q: Is this certified for home safety use?
A: No, this is for educational and prototyping purposes only. Do not rely on it for life safety.
Q: What gases does it miss?
A: It is not optimized for Carbon Monoxide. We recommend the MQ-7 sensor for CO detection.
Q: Does this work with 3.3V logic?
A: Yes, but the heater requires 5V. Logic output is generally compatible with 3.3V microcontrollers.
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