A
Anonymous
Apr 07, 2026
Rating: 5/5
Exactly as described
Fast shipping and good packaging. The sensor responds quickly to smoke.
Description
MQ-2/3/4/5/6/7/8/9/135 Sensor Module for Smoke, Alcohol, Air Quality, and Combustible Gas Detection
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Sensor Technology | Metal Oxide Semiconductor |
| Operating Voltage | 5V DC |
| Output Signal | Analog & Digital TTL |
| Preheat Time | 24-48 Hours |
| Detection Gases | LPG, Alcohol, Smoke, Methane, CO |
| Interface | 3-Pin Header (VCC, GND, OUT) |
| PCB Material | FR-4 Fiberglass |
| Module Size | 32mm x 20mm x 15mm |
| Compatibility | Arduino, ESP32, Raspberry Pi |
| Warranty | 30-Day Manufacturer Warranty |
5 reviews
A
Anonymous
Mar 15, 2026
Rating: 4/5
Solid hobby sensor
Not for industrial safety but great for learning electronics and IoT.
A
Anonymous
Mar 15, 2026
Rating: 5/5
Great for Arduino Projects
Works well with my Uno. Easy to wire up and read values via serial monitor.
A
Anonymous
Mar 10, 2026
Rating: 4/5
Sensitive but needs calibration
Took some time to stabilize. Make sure to let it preheat as instructed.
A
Anonymous
Feb 20, 2026
Rating: 5/5
Good value for money
Bought the MQ-135 for air quality monitoring. Perfect for hobbyists.
5 FAQ
Q: Which model detects carbon monoxide?
A: MQ-7 is specific for CO. MQ-2 is more general for combustible gases.
Q: Does this work with 3.3V logic?
A: The module operates at 5V. Logic levels may need shifting for 3.3V boards.
Q: Can I use this for home safety alarms?
A: Designed for educational and development use. Not certified for life safety.
Q: How long before it reads accurately?
A: Requires 24-48 hours initial preheat for stable baseline readings.
Q: Is the potentiometer for sensitivity?
A: Yes, it adjusts the digital output threshold trigger level.
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