Unfortunately, encroachment on private property are always more frequently. Here is a selection of alarms and similar circuits like Codeschloesser to protect your possessions as optimal. For car, motorcycle, home, etc.

Here you will find Schematic Circuit Diagram for DIY and further information on Safety Technology
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Keypad with Atmel AVR	www.avr.4mg.com/custom3.html
Alarm system for motorcycles, with tilt switch Easy to build, very low power consumption	www.zen22142.zen.co.uk/Circuits/Alarm/motorcycle.htm
Alarm system with LCD display, microprocessor	www.meinemullemaus.de/elektronik/alarmanlage2/
Movement with direction detection in passive infrared technology	www.glolab.com/freeinfo/GLDIR1.pdf