My RX-8 has an Alix-1 computer in the boot (thanks to Yawarra!) which is connected to a bunch of devices in the car, including an Arduino wired into the ignition system:
My RX-8 has an Alix-1 computer in the boot (thanks to Yawarra!) which is connected to a bunch of devices in the car, including an Arduino wired into the ignition system: