Bluetooth sensor circuit: This is folded into shape and over-moulded with plastic. Where devices have complex shapes, the electronics would traditionally have be spread across several conventional ...

That said, this sort of circuit still has plenty of practical, power-saving applications outside the realm of home security.

In this article, I'll show you how to built a Wireless Transfer of Energy Transmitter. Simply put, this device will send electricity to a florescent light bulb and light it up, from up to three feet.