A
Anonymous
Apr 10, 2026
Rating: 5/5
Great for Arduino projects
Works perfectly with my Uno board. Very sensitive to lighter gas during testing.
Description
MQ-2 Smoke Sensor Module for Alcohol, Methane, Coal Gas, Carbon Monoxide, and Combustible Gas Detection
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Sensor Model | MQ-2 |
| Operating Voltage | 5V DC |
| Detection Gases | LPG, Propane, Hydrogen, Methane, Alcohol, CO |
| Output Signal | Analog (AO) and Digital (DO) |
| Pin Count | 4 Pins |
| Heating Voltage | 5.0V ± 0.1V |
| Load Resistance | Adjustable via Potentiometer |
| Heating Resistance | 33Ω ± 5% (at room temp) |
| Operating Temperature | -10°C to 50°C |
| PCB Dimensions | 32mm x 20mm x 15mm |
5 reviews
A
Anonymous
Feb 18, 2026
Rating: 5/5
Easy to integrate
The digital output threshold is easy to adjust with the onboard potentiometer.
A
Anonymous
Feb 18, 2026
Rating: 4/5
Good value
Needs some calibration time but works well once warmed up. Good for learning.
A
Anonymous
Feb 12, 2026
Rating: 3/5
Okay for hobby use
Not precise enough for industrial safety applications but good for electronics learning.
A
Anonymous
Jan 26, 2026
Rating: 5/5
Exactly as described
Fast shipping and well packaged. The module is compact and easy to mount.
5 FAQ
Q: How long does it take to warm up?
A: Typically requires a 24-48 hour initial burn-in, then 1-2 minutes before each use for stable readings.
Q: Does this work with 3.3V logic?
A: The sensor operates at 5V, but the digital output can be interfaced with 3.3V systems using a level shifter.
Q: Can this detect carbon monoxide?
A: Yes, it is sensitive to CO, but please note this is for hobbyist prototyping only, not life safety.
Q: Is a library available?
A: Yes, many open-source libraries exist for Arduino and Raspberry Pi to read the analog values.
Q: What is the detection range?
A: It detects combustible gases roughly between 300ppm to 10000ppm depending on calibration and environment.
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