Design of Anti-theft Alarm System Based on AT89S52 MCU

This paper discussed the design of an anti-theft alarm system used pyroelectric infrared sensor and control AT89S52 as the core.The system perform the routines corresponding to different functions by judging the output signal of the infrared sensors.the keyboard is used to Human-Computer Interaction by the controling of microprocessor.The Display function is realized by low-cost 7-seg display.