How to use gas sensors with Arduino || Arduino tutorial

In this tutorial I'm demonstrating how to use MQ-2/MQ-5 gas sensors with Arduino. These little devices may be used in gas leakage detectors. The MQ-2 is suitable for detecting LPG, i-butane, propane, methane, hydrogen and even smoke. The MQ-5 detects LPG, natural gas and town gas. Many other gas sensors can be used in exactly the same way, e.g. MQ-3, MQ-6 or MQ-135. 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 Datasheets: MQ-2: https://www.pololu.com/file/0J309/MQ2... MQ-5: https://www.parallax.com/sites/defaul... See how to calibrate an MQ-2 gas sensor:    • How to calibrate an MQ-2 gas sensor || Ard...   See all my Arduino tutorials here: https://www.youtube.com/playlist?list... Subscribe to get notified about my new videos:    / subscription_c.  . ---------------------------------------------------------------------------------------------- YouTube channel:    / electron.  . Google+: https://plus.google.com/+Electronfuncom Facebook:   / electronfunpage   Twitter:   / electronfun   Website: http://ElectronFun.com ---------------------------------------------------------------------------------------------- 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