Q:

How to build a switch with Bluetooth?

I have a small circuit with a battery and a lamp. If I close the circuit the lamp will turn on, otherwise will turn off. 

I want to create a very small wireless switch. It will have only 2 signals to understand:

Turn On (close the circuit)
Turn Off (open the circuit)

The circuit will work with a 3V battery. And it need to be as small as possible. So, I think the Bluetooth will be the best. There are other good technology?
What I want is a start point. Where can I find a good book/tutorial to start this project? Or, if this is easy to say, how I build this switch?

A:

For BLE there are two popular devices:
CC2540 from TI
nRF8001 from Nordic Semiconductor
Both use BLE. You can then connect a relay to them to enable a switch. They have development platforms you can buy rather inexpensively and use (look at the key fob).

