Hi, I have a very rough idea for a kid's game like a treasure hunt. It would involve at least 2 boxes with Arduinos. One would contain the treasure and one would assist in finding the hidden treasure box. I imagine the assist box would have an lcd screen and give the user clues. The treasure box would possibly contain a speaker for sound when the treasurer hunter is close enough.
I have seen the GPS enabled treasure box that only open when in a certain location. My idea is for someone to put treasure in a box and then hide it around their house or outside. The treasure hunter then uses the other box to find the treasure.
My question is this: What is the best way to allow the the two boxes to "communicate"? Bluetooth? GPS? Xbee? I imagine you would need at least 50 feet so that may rule out Bluetooth. I'm not sure how far that goes.
It would need to be able to calculate a distance as to give the treasure hunter clues. What do you guys think? Is my idea possible?