I have a simple home project I'd like to implement. Being a electronics newbie I'm not sure exactly how to go about it.
Basically, I'd like to build a device that is attached to a (12V) power supply line that simply sends a wireless signal/alert to my smart phone when the power is turned on i.e. current running through the wire.
The signal only needs to be transmitted roughly 1-3m, so I assume some sort of Bluetooth transmitter spliced into, and piggybacking off the power running through the 12V wire will suffice? The device does not need to receive signals i.e. one-way communication only.