In this tutorial I'm demonstrating how to use MQ2/MQ5 gas sensors with Arduino. These little devices may be used in gas leakage detectors.
The MQ2 is suitable for detecting LPG, ibutane, propane, methane, hydrogen and even smoke.
The MQ5 detects LPG, natural gas and town gas.

Many other gas sensors can be used in exactly the same way, e.g. MQ3, MQ6 or MQ135. Just read the datasheet, use the appropriate load resistor and experiment with the "sensorValue" in my Arduino code.

Project page you can download Arduino code and see schematic used in this video here:
http://ElectronFun.com/project_2.php'>http://ElectronFun.com/project_2.php

Datasheets:
MQ2: https://www.pololu.com/file/0J309/MQ2...
MQ5: https://www.parallax.com/sites/defaul...

See how to calibrate an MQ2 gas sensor:
   • How to calibrate an MQ2 gas sensor |...  

See all my Arduino tutorials here:
https://www.youtube.com/playlist?list...

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Video, edit, voice by Chris Lorkowski

Music composed and performed by Bensound Happiness
http://www.bensound.com

Sound effects recorded by Mark DiAngelo Blop
http://soundbible.com