2、actThe design takes the microcontroller as the control unit and uses the pyroelectric infrared sensor as the media to send a signal to the microcontroller to achieve the goal of the cab car anti-theft by detecting the situation of vehicle cab. Pyroelectric infrared sensor has the characteristics
3、 of low cost, stable performance, high sensitivity, anti-interference ability and the infrared is not visible, so it has the advantage of good concealment in the area of infrared detection monitoring. The design also uses AT89C51 microcontroller, which has the characteristics of small volume,
4、powerful, light weight , wide application and so on. This system works under the control of the system software. Once somebody who gets into the cab is seen, pyroelectric infrared sensors immediately sends a signal to the microcontroller, then the system sends an interruption request to the MCU,
5、 the system begins to alarm ,till the car owner shuts down or the car automatically shuts down by itself without exception in 10 seconds, thus achieve the goal of improving vehicle safety.Keywords:MCU;Pyroelectricinfraredsensor;Anti-theftalarm目录前言11汽车防盗系统概述21.1汽车防盗器的定义21.2汽车防盗设备介绍22汽车防盗系统的分类及功用3