So I just finished the first stage of my project which was to lock and unlock my car based on the proximity of my phone using bluetooth and thought I'd share it with you guys to see if you have any feedback. I used a Raspberry Pi with the cheapest USB bluetooth dongle I could find at MicroCenter as the basis for my system. Essentially the RPi continuously polls my Galaxy S5 for RSSI data, and if the value is within a certain range one of the 3.3v GPIO pins is brought high for .2 seconds. The two GPIO pins are each connected to a transistor which activates a relay which closes off the two wires attached to either the lock or unlock button on the driver's side door (lock or unlock depends on which GPIO pin is activated.) One of the wires attached to the lock button is also connected to a voltage divider which is then connected to another GPIO pin set for input, keeping the pin normally high and bringing it low while the lock button is pressed. This allowed me to use the lock button to deactivate and reactivate the bluetooth unlock system by holding it down for 5 seconds. The RPi was originally $40 when I got it a year ago, however I believe you can get one for $30 nowadays, the bluetooth dongle was $10, the 2 relays were $12, I got a pack of 15 transistors for $3.50 at RadioShack, and the miscellaneous resistors, wire, and 2 diodes for the relays should run about $10, bringing the total cost to about $65. The next step is to install a push button start that's enabled by the RPi when the phone is close enough while retaining the functionality of the stock ignition. If anyone knows a good way to override the Ford PATS system I would really appreciate it. Lemme know if you guys have any suggestions and if anyone wants a full write up to do something similar I'd be more than happy to oblige.
No announcement yet.
2009 Mustang Bluetooth Proximity Unlock