RFID Car immobiliser with PIC12629

Step 4 Wrapping up

Programming:  Power up the immobiliser with the jumper in place.  The LED should go green and then go red.  You can then program up to 10 tags.  The LED will go orange when a tag is read, then go back to red (waiting for another tag).  If you want to 'erase' a tag, you must reprogam that position or 'key number'.  Best is to just keep reading the same tag over and over till all 10 positions are filled, or reprogramming the pic will clear the eeprom if needed.

Once you have programmed your tags in, you can remove the jumper.  The unit is now in 'operation' mode and the LED is red.

When a tag is read, the LED will go orange and If a good tag is read, the LED will go green for 1/2 a second, then extinguish totally and the relay will close. If a bad tag is read, it will go back to red waiting for another tag.

Bench test the setup and once you are happy with it, you can wire it into your car.

The main power for the circuit should come from an 'ignition' circuit on the car.  Then connect the 'switched' relay contacts between a feed to the coil(s) or ignition input to your EFI computer.

To operate, turn on the ignition of the car, then swipe the tag over the ID-12, the relay closes, then start the car.  If the car is turned off, the process must be repeated.