基于单片机的汽车防盗系统设计.doc

目录
摘要 2
1 引言 2
1.1 单片机技术应用现状 2
1.2 汽车防盗系统发展 4
1.3 本设计的主要工作 7
2 单片机汽车防盗系统的方案设计 7
2.1 系统总体设计方案 7
2.2 控制模块设计 8
3 系统硬件设计 9
3.1 主控芯片AT89C2051简介 9
3.2 超声波发射与接受电路设计 11
3.2.1 发射电路 11
3.2.2 555定时器简介 12
3.2.3 接收电路 14
3.2.4 锁相环译码器LM567简介 15
3.3 振动检测模块设计 16
3.3.1 振动检测模块硬件原理 16
3.3.2 CLA-3全向振动传感器简介 17
3.4 报警模块设计 18
3.4.1 光电耦合器简介 18
3.4.2 蜂鸣报警模块工作原理 19
3.4.3  EX-1智能拨号报警模块简介 20
3.5 切断点火模块设计 24
4 系统软件设计 27
4.1 系统主程序 27
4.2 延时子程序 28
4.3 中断处理子程序 28
4.4 振动检测子程序 29
结论 32
致谢 32
参考文献： 32

 
基于单片机的汽车防盗系统设计

摘要：本文介绍一种由AT89C2051实时控制及数据处理功能、利用超声波敏感器件作为发射与接收装置并依据多普勒效应、振动传感器和自动拨号的智能芯片EX-1制作的汽车防盗报警系统。使用时把此系统安装在汽车驾驶室内, 当有人非法进入车内时, 报警系统立即报警、切断汽车点火电路且会拨打预先存在智能芯片中的号码;或未解除防盗功能时拖动车辆或使车辆升离地面等团体性偷车时，振动传感器检测并将获得的信号送单片机处理，若达到报警限度就蜂鸣报警、关闭捕捉中断、切断汽车点火电路和拨打报警电话。经过这样处理,以往防盗系统经常出现的误报情况会大大减少。

关键词：AT89C2051; 超声波; 多普勒效应; 振动传感器; 自动拨号

Design of Auto Guard against Theft Based on Chip Microcomputer

Abstract: This paper presents a real-time control by the AT89C2051 and data processing functions, the use of ultrasound as a launch-sensitive devices and receiving devices in accordance with the Doppler effect, vibration sensors and automatic dial-up of the smart chip produced by EX-1 anti-theft vehicle alarm system. Put this system in the control cabin .when somebody comes in the car illegal, the system alarm and cut off the vehicle ignition circuit and will dial a pre-existing number of smart chip. When the car’s function of guarding against theft was not clear, lifting of the vehicle or dragging the car from the ground up and so on behaviors of Groups of  theft car, the vibration sensor will detect  signal and send to Chip Microcomputer.If the signal reached the limit on the alarm,the system will close interrupted of capture and cut off the vehicle ignition circuit and auto- alarm phone call. After such processing, in the past Phenomenon of Error alarm in anti-theft system will greatly reduce.
Key words: AT89C2051;  Ultrasound;  Doppler effect;  vibration sensor;  Auto-dial