Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Compatibility | MQ-2, MQ-3, MQ-4, MQ-5, MQ-6, MQ-7, MQ-8, MQ-9, MQ-131, MQ-135, MQ-136, MQ-137, MQ-138, MQ-139 |
| Operating Voltage | 5V DC |
| Output Signal | Digital Switch Output (0 and 1) & Analog Output |
| Detection Range | LPG, Propane, Hydrogen, Methane, Alcohol, Smoke, Carbon Monoxide |
| Interface Type | 3-Pin Header (VCC, GND, DO/AO) |
| Potentiometer | Adjustable Sensitivity Control |
| Indicator LED | Power LED and Digital Switch Output LED |
| PCB Dimensions | 32mm x 20mm x 10mm |
| Application | Arduino, Raspberry Pi, DIY Electronics, Home Safety Projects |
| Package Includes | 1x MQ Sensor Module |
Anonymous
Mar 31, 2026
Rating: 5/5
Excellent build quality
The soldering on the board is clean, and the pins are sturdy. I used this for a smoke detection prototype, and it responded quickly to test smoke. Highly recommended for hobbyists.
Anonymous
Mar 29, 2026
Rating: 5/5
Reliable and sensitive
I tested this against alcohol vapor and it triggered the digital output immediately after calibration. The compact size fits perfectly into my custom enclosure.
Anonymous
Mar 25, 2026
Rating: 4/5
Works as described
Easy to connect and use. The documentation online is plentiful which helped me get started quickly. Only giving 4 stars because the header pins were slightly bent upon arrival, but easy to fix.
Anonymous
Mar 16, 2026
Rating: 5/5
Great for learning electronics
Bought this for a university project on IoT home safety. The analog output allows for detailed data logging, and the digital output is great for simple alarms. Very versatile.
Anonymous
Mar 15, 2026
Rating: 5/5
Perfect for my Arduino project
This module worked flawlessly with my Arduino Uno. The sensitivity adjustment pot makes it very easy to calibrate for different environments. Great value for the price.
Anonymous
Mar 09, 2026
Rating: 4/5
Good sensor, needs warm-up time
The sensor works well once it has warmed up for a minute or two. Just remember that these gas sensors need a brief heating period before giving stable readings. Otherwise, very satisfied.
Q: Can this detect carbon monoxide specifically?
A: Yes, specific models in this series like the MQ-7 and MQ-9 are designed primarily for Carbon Monoxide detection. Please select the specific sensor type labeled on the component when ordering for best results.
Q: Does this module work with 3.3V logic boards like the ESP8266?
A: Yes, the digital output is generally compatible, but since the module operates at 5V, you may need a voltage divider or level shifter for the signal pin if your board is strictly 3.3V tolerant. The VCC should remain at 5V for the heater to function correctly.
Q: How long does the sensor need to warm up before use?
A: Typically, these MQ sensors require a warm-up period of about 24 to 48 hours for initial stabilization when new. For regular daily use, a 1-2 minute warm-up is usually sufficient to get stable readings.
Q: Is the library available for Python on Raspberry Pi?
A: While there isn't one single official library, many community-created Python scripts and libraries (like RPi.GPIO) are available on GitHub to read the analog and digital signals from this module using an ADC chip if your Pi lacks analog inputs.
Q: What is the difference between the DO and AO pins?
A: DO (Digital Output) provides a HIGH or LOW signal based on whether the gas concentration exceeds the threshold set by the potentiometer. AO (Analog Output) provides a continuous voltage value proportional to the gas concentration, allowing for precise measurement.
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