I am not sure if this is the right forum for this question, If not please help me move it to the right place :)
Question: I have 10-20 items like tables / books in a room and I want to put a small self powered chip on them (solar / battery) that i can use to track their position from another room (say 100-150 ft away), Is there any such module out there that i can use.
Like for instance say bluetooth / IR, I can have a tiny bluetooth / IR module attached to them and use my phone / Laptop to track / ping them. (bluetooth is for data transfer, all i want is like a homing beacon that just points its location)
If pointing location is a problem then it should just buzz it / turn an alarm when i try to locate it...
The key focus points are:
1) Size (smaller the better)
2) Power requirement (if can be powered by a button cell that can last say 6 months)
3) Cost (cheaper the better)