I'm looking for a (mostly) hardware solution to determining when each of my two cars is in the garage. It would seem that a beacon-type system would be a perfect solution to this but I am not at all up to date on the state of the art on this. In fact, its somewhat amazing that I even know what a beacon is.
Anyway, I was thinking broadly about a (low power) device permanently wired into each car that would emit a signal that would then be detected by something in my home. That would then be used to trigger a variable in Indigo that is true if the car is in the garage and false if it isn't. Once I have that, I can then move on to various actions (I'm comfortable enough with Indigo to do this part) that occurs when a car enters or leaves the garage.
Any suggestions for the hardware?