RFID-Based Auto-lock/unlock System
I'm looking to build a standalone system to use RFID with approx 2-3 meter range that will detect a RFID tag.
Upon detection of the proper RFID, I will have a OEM remote board wired into the system so it unlocks the doors.
When the RFID is no longer detected, I want it to lock the doors, then set the alarm (double button press of the 'lock' button)
The problem here is that I don't even know where to start. I've seen RFID kits but I don't know what to get. I don't want to bother with Bluetooth because the systems are crazy expensive. Once that is established I need a low-power intelligent system to make connections to correctly simulate a button press.
I'm not against a Fusion-brain for this, but I can't find any kind of RFID integration for it. Arduino might be better, but IIRC, PaulF had a very nice, arduino-based system that ended up drawing too much power at idle and killed his battery while his car was parked.
This will not be reading my factory keys' RFID chip, but this will be a separate system just to automatically hit the lock and unlock buttons for me using circuitry pulled from a spare remote. Existing remotes/keys will still operate normally, is the plan. So something that constantly sends a 'lock' signal while I'm away from the car is the wrong idea. Just need it to lock when detection first fails.
Any help on this project would be immensely appreciated. I know this is the community to get this kind of thing done.