Attributes

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

6 reviews

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.

5 FAQ

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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