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I have added some comments to the code. Feel free to make changes and mail me if you want to know something.
MESH: Rating System With Internet-Connected Buttons
The Arduino code is attached under Step 2 and the Android app is available under Step 3.
Schematic diagram is already attached to this instructable.
This is capable of switching on and off most of the devices. You can attach the devices to a relay module and use this project to control them. The total cost with Arduino and the relay board will be around $29 but could be cheaper if you go for a clone. The relay board will be around $5. You can check out some instructable on using a relay board.
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