A
Anonymous
Mar 31, 2026
Rating: 4/5
Sensitive sensor
Detects smoke quickly but avoid high humidity environments for best accuracy.
Description
MQ2 gas sensor module for smoke detection with reverse polarity protection, suitable for Arduino Uno R3.
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Brand | OpenJumper |
| Model Number | MQ-2 |
| Operating Voltage | 5V DC |
| Output Signal | Digital Switch Output and Analog Output |
| Detectable Gases | Smoke, LPG, i-butane, propane, methane, alcohol, hydrogen |
| Interface Type | 3-Pin Header (VCC, GND, OUT) |
| PCB Length | 32 mm |
| PCB Width | 20 mm |
| Operating Temperature | -10°C to 50°C |
| Protection Feature | Reverse-Polarity Protection Diode |
5 reviews
A
Anonymous
Mar 31, 2026
Rating: 4/5
Good value
Needs some calibration time but works well for the price point. Shipping was fast.
A
Anonymous
Mar 09, 2026
Rating: 5/5
Robust build
The protection diode is a nice touch for beginners who might wire it backwards.
A
Anonymous
Feb 24, 2026
Rating: 5/5
Works great with Arduino
Easy to integrate into my smart home prototype. The digital output is very responsive.
A
Anonymous
Jan 28, 2026
Rating: 5/5
Perfect for students
We used these in our robotics club. Durable and easy to wire up for beginners.
5 FAQ
Q: Can I use this with Raspberry Pi?
A: Yes, but ensure logic level compatibility as the sensor operates at 5V.
Q: How do I adjust sensitivity?
A: Use the onboard potentiometer to adjust the digital threshold output.
Q: What is the current consumption?
A: Approximately 150mA during the heating phase.
Q: Does it detect Carbon Monoxide?
A: No, MQ-2 is for combustible gases. Use MQ-7 for Carbon Monoxide detection.
Q: Is this certified for residential use?
A: No, this is for educational and prototyping purposes only. Not for safety critical systems.
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