摘要：随着科技的飞速发展，人们生活水平的不断提高。现在的人们加强了财产的防范意识，同时追求生活方式简单化。在家庭或在工作中人们使用机械锁的从而避免不了带多把钥匙，对人们的生活工作及其的不方便而且还容易丢失。机械锁的安全性能极差，对于人们的财产保护大打折扣。与此同时出现的问题是：传统的机械锁根本满足不了人们的需求。为满足人们需求单片机的电子密码锁就应运而生。94026

基于单片机密码锁的设计是以STC89C51RC单片机为核心设计的密码锁，该密码锁可以实现密码的输入，密码的修改，显示，报警，开锁等装置。程序设计是采用C语言编译，下载至STC89C51RC中，从而来完成所要实现的功能。单片机控制的密码锁比起传统的机械锁损耗较小，从而较为耐用。同时比起机械锁它还更加的安全，可以更好的对财产进行保护。

通过实验得以证明，单片机电子密码锁可适用于家庭以及办公室用锁的基本要求，比起传统的机械锁更加安全实用，对人们财产的保护有了保障。

毕业论文关键词：密码锁，报警，显示，STC89C51RC单片机 

Abstract: With the rapid development of science and technology, the continuous improvement of people's living standard。Now people to strengthen the awareness of the property, and the pursuit of simple way of life。People in the family or work in the mechanical lock used to avoid the belt more keys, work on people's lives and is not convenient but also easy to lose。Mechanical lock safety performance is poor, to protect people's property。At the same time the problem is: the traditional mechanical lock fundamental can't satisfy people's needs。To meet the demand of the single chip microcomputer electronic combination lock was born。

Based on single chip microcomputer combination lock design based onSTC89C51RC single-chip microcomputer as the core design of combination lock, the combination can realize the password input, the password change, display, alarm, lock device, etc。Design program is compiled using C language, download to STC89C51, thereby to complete in order realize the function。Combination of single chip microcomputer control less than the traditional mechanical lock loss, which is more durable。More security than mechanical lock it at the same time, can be better to protect the property。

Through the experiment to prove, single-chip electronic combination lock can be applied to the basic requirement of home and office use lock, compared with the traditional mechanical lock is more secure and practical, to protect people's property security。

Keywords:Coded Loc,Alarm System,LED,STC89C51, single-chip microcomputer

  目  录

1 绪论 5

1。1 电子密码锁简介 5

1。2 电子密码锁的发展趋势 5

1。3 本设计所要实现的目标 6

2 总体设计方案的确定 6

2。1 电子密码锁设计的具体要求 6

2。2 总体设计方案选定 6

3 主要元器件介绍 7

3。1 主控芯片STC89C51RC 7

3。2  STC89C51RC引脚介绍 8

4 系统硬件设计 11

4。1 设计原理 11

4。2 电路总体构成 11

4。3 键盘输入部分 12

4。4 密码存储部分