I'd like to know if it could be possible to make an active transmitter of some sort(as opposed to passive RFID tags) that transmits my personal access card's signal(or whatever) such that when I walk up to a door, it unlocks before I get to it. For discussion purposes, say 5 feet away. Is this possible given the fundamental theory of how RFID works?? Also my card(s) are HID brand. These
are the kind of cards I will be working with.
Any links to GOOD literature on how to work with RFID cards and related are certainly welcome. I have read through the wikipedia page, but I couldn't answer my question with the information there.
Assuming that this idea doesn't get shot down, I'll be posting images and code as I go along.