What sensors / networking protocol should I use for this project?
I'm a relative newcomer to the maker scene but I've been into GNU/Linux, BSD, shell scripting, Java and more for quite awhile.
So here is my dilemna.
Basically I'm trying make a device in which, let's say a child or dog, comes within 4 - 6 feet of an object and an alarm goes off. However the trick is that the alarm can only go off when the particular dog/person is close to the item; basically I have to pair two sensors or some type of communication devices together.
I was thinking bluetooth, zigbee...unless I'm missing out on a particular sensor (or set of sensors) that could be paired together.
EDIT: Of course RFID would work, but the max distance is about 4 inches I think?