Hey all. For fun, I have decided to make a tracking device for my dog. I don't need exact latitude and longitude coordinates or anything, plus GPS is expensive (I'd like to make the whole project for under $100). I was thinking of putting a xbee on my dog and, on my end (also with an xbee), measuring the signal strength to determine roughly how far away he is. The problem is that signal strength is unreliable; it works well for line-of-sight applications, but if my dog is behind thick trees or a house or something, the signal strength will be weaker, and it'll read out that he's farther away (even though he's not). Anyone have any good ideas? Kind of stumped. Or maybe I can add a video camera or microphone to the electronics on my dog so I can at least see where he is or hear him when he gets lost?