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Don't worry, this is going to make your time with Raspberry Pi easier and fun. All you have to do is install the app and install HTTP server, wiringPi library and upload our Switch.php file on your raspberry to get this app working.
If you want to control from anywhere in the world install Weaved on Raspberry Pi to get this working.
Read guide on https://github.com/juniorhero/raspberrypi2