摘 要：随着汽车盗窃案件与日俱增，车辆被盗的数量逐年上升，为了防止汽车被盗，给汽车装上防盗报警系统实有必要，为此本文提出了一种汽车防盗报警器的设计方案。本设计采用现在普遍应用于报警器中的热释电红外线传感器进行盗情信号的检测，用AT89C2051单片机控制处理报警信号，当此报警器处于警戒状态下，发生盗窃时，传感器会将检测到的信号送到单片机，经单片机分析处理产生声光报警，并且切断汽车点火线圈电源使汽车无法启动，达到防盗的目的。此外，为避免车主进入车内产生误报警，采用了红外遥控器控制报警系统电源的通断，由车主自行控制。本系统具有性价比高、实用性强的优点。65887

毕业论文关 键 词：红外遥控，热释电红外传感器，AT89C2051单片机，声光报警

Abstract: As the quantity of personal automobile increases, cases of stealing cars rise day by day, causing the lost of automobile goes right toward the peak, to prevent the vehicles from being taken robbed, an anti-theft system including alarming module is absolutely necessary for every single automobile. Therefore a new scheme of anti-theft and warning system for vehicles is announced. In this thesis, an anti-theft alarm system with features of high performance-to-price ratio, much easier manufacture procedure and great practical usages is introduced. In sensing module, the pyroelectric inferred sensor is selected for detecting signals of stealing; And the microcontroller AT89C2051 which is used. When the whole system is in guarding status, and stealing behavior has been detected, sensing module will send the detected signal to the microcontroller. After processing by the microcontroller, sound and light warning will be activated. And the vehicle will not be fired anyway because the automobile ignition coil power source will be cut off at the same time. In this design, inferred remote controller is in charge of control alarm system power source supply, to avoid the car owner triggers the warning by mistake. the whole system is small volume and low cost.

Keyword: inferred remote control, pyroelectric inferred sensor, microcontroller AT89C2051, sound and light alarm

目   录

1 前 言 4

1.1选题背景 4

1.2研究现状 4

1.3主要工作 5

2 系统总体设计方案 5

2.1设计要求 5

2.2原理框图 5

3 系统硬件设计 6

3.1 红外遥控发射器 6

3.2 电源电路 8

3.3 红外遥控接收及控制电路 9

3.4 热释电红外传感器对汽车的监测 13

3.5 声光报警电路和切断电路 15

3.6 中央处理模块 18

4 系统软件设计 21

4.1 概述 21

4.2 软件实现 22

结 论 23

参考文献 25

致谢 26

附录A 软件实现源程序 27

附录B 系统总电路图 29

1 前 言

1.1 选题背景