I bought a cheap RC toy car for 5 Euros then removed its transmitter and receiver. I then used the Arduino to drive the transmitter signals. The RC system is based on the TX2/RX2 ICs. With relays, for example, on the receiver, I can now use the Arduino system to control anything I want such as home appliances or any other gadget.
There will be more details on the following link:
http://www.instructables.com/member/techbitar
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