In the traditional American living room there are no light fixtures, light is provided purely from lamps. To accommodate this, one of the outlets is controlled by a light switch on the wall. Unfortunately, it generally takes several lamps to light the room and you end up having to flip the light switch to turn on one lamp and walk over to the other lamps to switch them on. It really isn’t a big deal, but it can be annoying. My solution was extend to light switch controlled outlet to the other outlets in the room through a wireless transmitter and relays on the other outlets.
The backbone behind this whole project is a cheap wireless receiver/transmitter pair, at only a few dollars a piece. Processing is done through a PIC16F688 microprocessor, a mechanical relay is used to turn on and off the outlet, and a nice plastic enclosure hides all of the parts and provides either a pass through outlet, for the transmitting enclosure, or a relay controlled outlet, for the receiving enclosure.
In essence, the transmitting box is plugged into the outlet controlled receptacle and when the outlet is turned on, by the light switch, the circuit powers up and begins transmitting a signal. The receiver is plugged in across the room and constantly powered. It simply waits for the signal and flips the relay when it receives it. When the light switch is turned on, the transmitter loses power, the signal stops being transmitted, and the receiver turns the relay off. Additionally, the receiver has a small button which can be used to manually turn on or off the relay.
All it takes is a simple flip of a light switch, and all the lights in the room turn on!