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总字数：18800+
摘 要
随着当前人们经济的发展，人们生活水平的提高，当前人们对财产安全和人身安全的重视程度越来越高，此次设计一款指纹密码锁双重加密设计，主要是为了解决当前大部分用户使用的密码锁在输入密码锁被旁人盗取，或者存在有人多次输入密码从而盗取用户密码，给用户造成财产损失。
随着电子产品智能化和小型化的不断发展，电子密码锁已在生活中得到广泛应用，单片机已成为电子产品研发中的首选控制器。由于单片机具有体积小，功耗低，控制精度高，运行可靠的特点，因此在实际生产中得到了广泛的应用。为了更好地促进电子锁在各个领域的应用，此次设计的基于STC89C52单片机控制的电子密码锁。该机器通过使用单片机STC89C52进行编写程序，并使用LCD1602显示密码。当前输入的六个数字使用“*”显示在屏幕上。正确输入密码后，密码相应的指示灯会亮起，并且显示屏会显示门已打开，继电器控制电磁锁打开；当错误的密码输入次数超过三次时，蜂鸣器会发出警报信号，并且显示屏会显示密码错误，自动锁定键盘三分钟。用户可以根据需求重新设置电子锁密码，且通过单片机内部的eeprom对输入的密码进行存储，用户可以输入自己的密码，密码输入正确之后，也可以打开门锁，且可以对指纹进行增加和删除。此次设计可以解决当前，电子密码的输入密码过程中密码被盗窃，或者被不法分子对当前密码锁的试错从而打开用户家中进行盗窃。此次设计的电子密码锁具有操作监简单、保密性强、防偷窥的优势。
关键字：密码锁；指纹；防偷窥；STC89C52单片机；LCD1602显示屏
Abstract
Along with the development of the current economic people, people living standard rise, present the importance of property security and personal security is higher and higher, the design of a double encryption fingerprint combination lock design, mainly to solve the current combination of the majority of users in the input combination lock by others to steal, or there is some input password to steal the user password for many times, Cause property damage to users.
With the continuous development of electronic products intelligence and miniaturization, electronic password lock has been widely used in life, SCM has become the preferred controller in the development of electronic products. Because microcontroller has the characteristics of small size, low power consumption, high control precision and reliable operation, it has been widely used in practical production. In order to better promote the application of electronic lock in various fields, the design of electronic lock based on STC89C52 microcontroller control. The machine through the use of MCU STC89C52 programming, and use LCD1602 display password. The six digits currently entered are displayed on the screen using “*”. After correctly entering the password, the corresponding indicator light of the password will light up, and the display screen will show that the door has been opened, and the relay control electromagnetic lock is opened; When an incorrect password is entered for more than three times, the buzzer will send out an alarm signal, and the screen will display the incorrect password, and the keyboard will be automatically locked for three minutes. The user can reset the electronic lock password according to the requirements, and the input password is stored through the EEPROM of the MCU. The user can input his own password. After the password is input correctly, the user can also open the lock, and the fingerprint can be added or deleted. This design can solve the current, electronic password input password is stolen in the process of password, or the criminals on the current password lock trial and error so as to open the user’s home theft. The design of electronic password lock has the advantages of simple operation, strong confidentiality and anti-peeping.
Key word：A combination lock; Fingerprint; Peeping prevention; STC89C52 MCU; LCD1602 display
目 录
第一章 绪论
第二章 系统总体设计方案
第三章 硬件系统设计
第四章 系统程序设计
第五章 仿真调试
第6章 实物调试
结 论
参 考 文 献
致 谢
附录