![]() There's also the option of using sensors which detect loud noises and kinetic shock to the car frame (like seismic sensors, but not seismic sensors). ![]() Ask for more detail on Electrical Engineering / Arduino stackexchange if you need a controller for your builtin siren. I've used HC-SR05, but I recommend something less sensitive, it can pick up movement from 5-7 metres. The 3V3 signal lasts about a second, and the PIR will auto-reset. If you can't find an alarm system that is tripped by 3V3, it's easy to amplify to 5-12V with a transistor. Just pull a wire from 12V to a voltage regulator (7805 is very cheap and reliable). When triggered by motion, they shoot a 3V3 signal out, which can be used to trip an alarm. They consume current in the microamp-milliamp range (5V) when active, so it won't run down your battery. You can get extremely cheap and low-power motion sensors (PIR type).
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