Car Tilt Alarm
The car alarm described here detects changes in the tilt angle of the vehicle in which the alarm is installed. It is set off when the change in the angle exceeds a threshold (adjustable) for too long (5 seconds). Short of cutting the power to it, the only way to stop the alarm is to put the car back to its initial angle. The change in angle to which the alarm is sensitive can be adjusted from 0 to 25°.