Hi, I'd like to create a device that locks/unlocks my car doors when my iPhone is within a specific range of my car ( and with Bluetooth activated and paired). I have a spare remote, I've taken it apart and can complete the correct circuit with a wire. I will use a MOSFET to do this for me digitally. I understand the inherent problems that may arise from hardware failure, relating to the Bluetooth itself (connecting / dropping the connection, not pairing, etc) but I'd like to try anyway.
My question is this: I have an Arduino micro, but I will purchase a mini for the final product. I'm looking for the smallest Bluetooth 'shield' I can use. I am unsure if shield is the correct word because I found this: http://www.seeedstudio.com/depot/serial-port-bluetooth-module-masterslave-p-572.html?cPath=139_142. It seems to be what I need as it provides a serial port, which will supply the data I need to control the MOSFET. It also seems to be fairly small and reasonably priced.
Does anyone care to comment on whether this sounds feasible? And if I've found the right components?
Thanks in advance.