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The DIY Android Home Automation project comes with a free application called “DIY SmartHome” . This application controls the various appliances connected to your arduino and relays. When the toggle buttons on the application are pressed, corresponding bluetooth signals are sent from your android phone to the bluetooth module you have hooked up to your arduino. The arduino finds out which signal was sent and compares it to the predefined signals assigned for each appliance. When it identifies that signal, then the arduino activates the relay hooked up to its digital pin by passing 5V through it. Thus the relay is switched ON and the corresponding applia