摘要 随着人们生活水平的逐步提高，电子科技飞速发展，日常工作中的安 全隐患问题也越来越被广大民众所重视。住宅中的个人物品与部门的财 务可能被高科技犯罪所觊觎。然而传统的机械式锁具性能良莠不齐，基于 金属钥匙或机械转盘式的密码锁设计理念非常陈旧，材料容易老化，结构 易被复制并破解，功能简单且唯一，技术含量长时间得不到更新，已经不 能满足新时代的安全与个性化需求。针对这一现状，市场上带有部分智能 化防盗报警等特性的电子密码锁的普及已是必然趋势。可用图像处理技 术来进行指纹识别，开发出带有指纹识别功能的电子密码锁，甚至可以触 屏输入。由于其具有较高安全性、性价比高、节能低碳、操作简易且拥有 对用户友好界面等优点，它将逐步服务于我们的生活，代替密码量少、操 作不便且易被破解的机械式密码锁。 84961

本设计先用 matlab 进行关于指纹识别图像处理算法的验证，再根据 实际操作情况，开发出新的密码锁。本课题以性能优越的单片机 AT89C52 为主控制核心，并在外围 I/O 口连接常见低功耗液晶显示 LCD1602、存储 密码锁密码的外部存储芯片 AT24C02、能实现短距离通讯的红外遥控模块、 可录入 20 个指纹的指纹识别录入模块等电路，再辅以输入密码的矩阵键 盘模块、用于报错清零的独立键盘、给予系统稳定能源的电源电路。本系 统以继电器的开合模拟开锁闭锁的过程，并可同时用三种方式解锁，尤其 针对视力不佳的老人，可通过遥控器解锁，在实际操作中具有极大的便利

性。系统具有三种方式快捷智能开锁、穷举密码暴力破解等非法操作报警与对系统误操作报警、忘记密码管理员可重置并修改密码等人性化的基 本功能。方便安全可控。整个模块的设计与搭建在 Keil 开发环境下完成， 结合芯片资料用 C 语言编译中央处理器的控制程序，以实现具有多功能 并节电的指纹识别电子密码锁。 

毕业论文关键词：单片机；红外遥控；指纹识别；密码锁 

Abstract With the gradual improvement of reform and opening up and technological progress and people's living standards，the rapid development of Electronic Science and Technology ， daily work safety problems are increasingly  being  valued  by  the  general  public。  Financial  and    personal

belongings residential sector could be coveted by high-tech crime。 However, the traditional mechanical locks mixed performance。 The cipher lock based on the metal key or the mechanical rotary table has the advantages of simple structure and simple function, and cannot meet the safety requirements of the new era。 In view of this situation, the market with some intelligent anti-theft alarm and other characteristics of the popularity of electronic password lock is an inevitable trend。 Because of its high security, low price, low power consumption, easy to operate and so on, it will gradually serve our lives, instead of less password and easy to be cracked mechanical password lock。

The design of AT89C52 as the control core and in the periphery add the liquid crystal display LCD1602, external memory chip AT24C02, infrared remote control module, fingerprint recognition input module, and matrix keyboard input module, an independent keyboard reset and power supply circuit。 The process of this system based on the relay switching simulation unlocking atresia, and can be used in three ways to unlock, especially for poor vision of the elderly, can be unlocked by remote control, in the actual operation

with great convenience。 The system has the quick and intelligent unlocking, the illegal operation alarm, the administrator to modify the password and other basic functions。 It is convenient and safe controllability。 The whole module is designed and built in the Keil development environment, combined with the chip data using C language to compile the control program of the central processor, in order to achieve a multi-function and power saving fingerprint identification electronic password lock。