This tutorial would help you understand how you can connect your Android Device to a Canon DSLR and use it as a controller for your DLSR. This approach helps you do Timelapse and Long Exposure Photography, without the need of Intervalometer or a Remote Release.
The Apps that can be used to control your DSLR are:
https://play.google.com/store/apps/details?id=com.pa.dslrremotecontrol
https://play.google.com/store/apps/details?id=com.HeliconSoft.HeliconRemote2
https://play.google.com/store/apps/details?id=eu.chainfire.remoterelease
You would also need a USB OTG cable which you can get for few bucks from online stores:
Amazon.com- http://amzn.to/2eC3dkL
Amazon.in- http://amzn.to/2fxhJw2
