Arduino

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Bluetooth 220 V voltage switch

Control a household lamp with your smartphone.

Needed:

Arduino board
5v relay for arduino
bluetooth modem (https://www.sparkfun.com/products/12577)
android sdk
android phone
jumper wires

connecting blue tooth modem to arduino

Important thing is that your modem supports 5v power. Many boards are built for 3v. Only four wires needed:

Connect grd on arduino to grd on modem
Connect 5v of arduio to vcc on modem
Connect arduino digital pin 2 to tx on modem
Connect arduino digital pin 3 to rx on modem

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