Interfacing MQ2 To Arduino- Gas Sensor For Smoke-Butane-CH4 And ...

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Summary of Interfacing MQ2 to Arduino- Gas Sensor for Smoke-Butane-CH4 and LPG

The article explains how to interface the MQ2 Gas Sensor with an Arduino. The MQ2 sensor detects various gases such as LPG, Butane, Methane, Hydrogen, and smoke, making it useful for smoke alarm applications. It compares MQ2 with MQ5, noting MQ2's sensitivity to higher concentration gases and smoke, whereas MQ5 is better for detecting lower LPG levels. The choice between MQ2 and MQ5 depends on the target gas concentration range. The article also introduces circuit diagrams for connecting MQ2 to Arduino using digital output.

Parts used in the MQ2 Gas Sensor Interface with Arduino:

  • MQ2 Gas Sensor
  • Arduino Board
  • Connecting wires
  • Power supply (usually 5V from Arduino)
  • Breadboard (optional)

In this article, we are going to learn how to interface MQ2 Gas Sensor with Arduino. MQ2 is basically a general purpose gas sensor (similar to MQ5) which can sense a broad range of gases like LPG, Butane, Methane(CH4), Hydrogen and in addition to these gases MQ2 is sensitive to smoke as well.

MQ2 to Arduino- Gas SensorIn a previous article, we have wrote a tutorial on Interfacing MQ5 Gas sensor to Arduino. Both MQ5 and MQ2 are basically gas sensors but their range of sensing different gas levels vary. For example, MQ5 can sense LPG in a broader range of 200 ppm to 10000 ppm, where as the range of MQ2 for LPG is short and is from 5000 ppm to 10000 ppm. Similarly MQ2 is sensitive to smoke where as MQ5 is not that sensitive to smoke. So we can not choose MQ5 gas sensor to design a smoke alarm or smoke involving applications. MQ2 can sense methane(CH4) upto 20000 ppm where as MQ5 can sense CH4 only upto 10000 ppm. The difference between MQ5 and MQ2 therefore lies in its range of values. We choose the right sensor based on the application requirement; say for example – We can not choose MQ2 for sensing low levels of LPG in the range of 700 ppm because MQ2 is insensitive low levels of LPG (its range begins at 5000 ppm and extends to 10000 ppm). So for applications to sense low levels of LPG, MQ5 is the ideal choice as it can sense values starting from 200 ppm.

So here are our circuit diagrams!

Interfacing MQ2 to Arduino using Digital OutMQ2 to Arduino- Gas Sensor

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About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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