Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	MQ-5
Detection Gas	LPG, Natural Gas, City Gas
Operating Voltage	5V DC
Output Signal	Analog (0-5V) and Digital (TTL)
Preheat Time	24-48 hours
Sensitivity Adjustment	Potentiometer included
Interface Type	3-Pin Header (VCC, GND, DO/AO)
PCB Dimensions	32mm x 20mm
Compatible Platforms	Arduino, Raspberry Pi, STM32
Package Contents	1x MQ-5 Sensor Module

6 reviews

Anonymous

Mar 26, 2026

Rating: 5/5

Reliable detection

Tested it with a small amount of propane from a lighter (safely at a distance). The digital trigger kicked in immediately when I adjusted the potentiometer correctly.

Anonymous

Mar 14, 2026

Rating: 4/5

Good sensitivity, needs patience

The sensor works well once it has warmed up for about 24 hours as instructed. Before that, the readings were fluctuating wildly. Great value for the price.

Anonymous

Mar 14, 2026

Rating: 5/5

Great for university projects

Bought this for our final year embedded systems project. Documentation online is plentiful, and the module itself is robust. Highly recommend for students.

Anonymous

Mar 10, 2026

Rating: 4/5

Solid performance

Works exactly as described. The only downside is the power consumption during the heating phase, but that is standard for metal oxide sensors.

Anonymous

Mar 10, 2026

Rating: 5/5

Easy to calibrate

The onboard potentiometer makes setting the threshold for the digital output very straightforward. No complex coding required for basic alarm functionality.

Anonymous

Mar 03, 2026

Rating: 5/5

Perfect for home safety projects

I used this module to build a kitchen gas leak detector. The analog output is very stable after the initial preheat time. Easy to interface with my Arduino Uno.

5 FAQ

Q: Can this detect carbon monoxide (CO)?

A: This specific MQ-5 model is optimized for LPG, natural gas, and city gas. For Carbon Monoxide detection, please consider our MQ-7 or MQ-9 modules which are specifically tuned for CO.

Q: How do I adjust the sensitivity threshold?

A: There is a blue potentiometer on the back of the PCB. Rotate it clockwise to increase sensitivity (trigger at lower gas concentrations) and counter-clockwise to decrease it. Use a small screwdriver for fine adjustments.

Q: Is the output voltage compatible with 3.3V logic boards like ESP32?

A: The sensor operates on 5V. While the analog output can often be read by 3.3V boards, the digital output high level will be 5V. We recommend using a voltage divider or a logic level converter for the digital pin when connecting to 3.3V microcontrollers to ensure safety.

Q: Does this module require an external library to work with Arduino?

A: No external library is strictly necessary. You can read the analog value using the standard analogRead() function. However, many community libraries exist to help with calibration and ppm conversion.

Q: What is the warm-up time before accurate readings can be taken?

A: For stable and accurate readings, we recommend allowing the sensor to preheat for at least 24 to 48 hours upon first use. Subsequent power cycles may require less time, but 10-20 minutes is usually sufficient.

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