A
Anonymous
Apr 13, 2026
Rating: 4/5
Good sensitivity
Requires a warm-up period but readings are stable afterwards. Good for hobby projects.
Description
Tmall 14-Year Established Store Risym Weixin High-Quality Best-Seller
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Model Number | MQ-135 |
| Detection Gases | NH3, NOx, Alcohol, Benzene, Smoke, CO2 |
| Operating Voltage | 5V DC |
| Output Signal | Digital Switch (0/1) and Analog |
| Heating Voltage | 5.0V ± 0.1V |
| Load Resistance | 20KΩ |
| Heating Resistance | 33Ω ± 5% |
| Operating Temperature | -10°C to 50°C |
| PCB Dimensions | 32mm x 20mm |
| Pin Interface | 4-Pin Header (VCC, GND, DO, AO) |
5 reviews
A
Anonymous
Mar 13, 2026
Rating: 5/5
Great value
Cheap and effective for general gas detection experiments. Analog output is smooth.
A
Anonymous
Feb 28, 2026
Rating: 5/5
Reliable module
Used this for a university project. Data logging was consistent over several days.
A
Anonymous
Feb 16, 2026
Rating: 5/5
Perfect for Arduino
Works exactly as described. Easy to interface with my Uno board for air quality monitoring.
A
Anonymous
Jan 30, 2026
Rating: 4/5
Solid sensor
Potentiometer allows easy threshold adjustment. Just remember it needs 5V power.
5 FAQ
Q: What does the potentiometer do?
A: It adjusts the sensitivity threshold for the digital output pin (DO).
Q: Does this detect CO specifically?
A: It is sensitive to CO among other gases like NH3 and Benzene, but it is not specific to CO alone.
Q: Can this run on 3.3V logic?
A: The sensor heating requires 5V. The output can be read by 3.3V MCUs but ensure voltage levels are compatible.
Q: Is there a library for this?
A: Standard analogRead functions work. Many community MQ sensor libraries are available on GitHub.
Q: How long is the warm-up time?
A: Initial burn-in is 24-48 hours. Before each use, allow 1-2 minutes for heating stabilization.
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