目錄
摘要 2
1 引言 2
1.1 單片機技術應用現(xiàn)狀 2
1.2 汽車防盜系統(tǒng)發(fā)展 4
1.3 本設計的主要工作 7
2 單片機汽車防盜系統(tǒng)的方案設計 7
2.1 系統(tǒng)總體設計方案 7
2.2 控制模塊設計 8
3 系統(tǒng)硬件設計 9
3.1 主控芯片AT89C2051簡介 9
3.2 超聲波發(fā)射與接受電路設計 11
3.2.1 發(fā)射電路 11
3.2.2 555定時器簡介 12
3.2.3 接收電路 14
3.2.4 鎖相環(huán)譯碼器LM567簡介 15
3.3 振動檢測模塊設計 16
3.3.1 振動檢測模塊硬件原理 16
3.3.2 CLA-3全向振動傳感器簡介 17
3.4 報警模塊設計 18
3.4.1 光電耦合器簡介 18
3.4.2 蜂鳴報警模塊工作原理 19
3.4.3  EX-1智能撥號報警模塊簡介 20
3.5 切斷點火模塊設計 24
4 系統(tǒng)軟件設計 27
4.1 系統(tǒng)主程序 27
4.2 延時子程序 28
4.3 中斷處理子程序 28
4.4 振動檢測子程序 29
結論 32
致謝 32
參考文獻： 32

 
基于單片機的汽車防盜系統(tǒng)設計

摘要：本文介紹一種由AT89C2051實時控制及數(shù)據(jù)處理功能、利用超聲波敏感器件作為發(fā)射與接收裝置并依據(jù)多普勒效應、振動傳感器和自動撥號的智能芯片EX-1制作的汽車防盜報警系統(tǒng)。使用時把此系統(tǒng)安裝在汽車駕駛室內, 當有人非法進入車內時, 報警系統(tǒng)立即報警、切斷汽車點火電路且會撥打預先存在智能芯片中的號碼;或未解除防盜功能時拖動車輛或使車輛升離地面等團體性偷車時，振動傳感器檢測并將獲得的信號送單片機處理，若達到報警限度就蜂鳴報警、關閉捕捉中斷、切斷汽車點火電路和撥打報警電話。經(jīng)過這樣處理,以往防盜系統(tǒng)經(jīng)常出現(xiàn)的誤報情況會大大減少。

關鍵詞：AT89C2051; 超聲波; 多普勒效應; 振動傳感器; 自動撥號

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