Description
Reviews
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Sensor Series | MQ-2 / MQ-3 / MQ-4 / MQ-5 / MQ-6 / MQ-7 / MQ-8 / MQ-9 / MQ-135 |
| Operating Voltage | 5V DC |
| Output Type | Analog (AO) and Digital TTL (DO) |
| Comparator IC | LM393 Wide Voltage Comparator |
| Sensing Target | Combustible Gas, Alcohol, Smoke, CO, Hydrogen |
| Preheat Duration | 24-48 Hours Recommended for Stability |
| Operating Temperature | -10°C to 50°C |
| PCB Dimensions | 32mm x 20mm x 22mm |
| Interface Pins | VCC, GND, Digital Out, Analog Out |
| Application | DIY Electronics, Prototyping, Education, Robotics |
Anonymous
Apr 01, 2026
Rating: 4/5
Value for money
Cheaper than local electronics stores and works just as well for hobby projects. Shipping was fast.
Anonymous
Mar 26, 2026
Rating: 5/5
Perfect for students
Used in our workshop for teaching sensor interfacing. Students found it easy to integrate with Arduino boards.
Anonymous
Mar 05, 2026
Rating: 5/5
Solid build quality
PCB looks professional and soldering points are clear. The header pins were included which was a nice touch.
Anonymous
Feb 28, 2026
Rating: 4/5
Good sensitivity
Takes time to warm up as described, but once heated it detects gas changes quickly. Good value for the price.
Anonymous
Feb 23, 2026
Rating: 5/5
Works great with ESP32
Connected easily to my ESP32 project. The analog output is smooth and the digital threshold is adjustable via the potentiometer. Great for learning.
Q: How do I calibrate the sensor?
A: Place the sensor in clean air for the preheat period, then read the baseline analog value to set your threshold.
Q: What is the exact pinout configuration?
A: The pins are labeled on the PCB: VCC for power, GND for ground, DO for digital output, and AO for analog output.
Q: Which model is best for detecting alcohol vapor?
A: The MQ-3 model is specifically optimized for alcohol and ethanol detection compared to the other variants.
Q: Does it work with 3.3V logic microcontrollers?
A: Yes, the digital output is compatible, but we recommend powering the module with 5V for proper heater operation.
Q: Is this certified for home safety alarm systems?
A: No, this module is designed for educational and prototyping purposes only. It is not certified for life-safety applications.
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