学位论文—-课程设计电子密码锁(附原理图及pcb).doc

I ×× 大学课程设计说明书电子密码锁摘要: 本设计是通过判断输入密码正确与否从而控制相应电路工作,完成***、报警、锁定键盘等任务的电子密码锁。它具有预设密码功能,超时报警功能,键盘锁定功能,错误提示功能等。预设密码和输入密码是用两个八位的锁存器实现,密码判断是由数值比较器电路组成,超时报警功能是用 NE555 所构成的单稳态触发器实现,超时次数及密码错误次数由计数电路记录,而键盘锁定功能则是通过电路的逻辑关系巧妙控制锁存器的输出使能端实现的。关键词: 电子锁,密码锁, 键盘锁定,报警电路 Abstract : This design istocontrol the corresponding circuit by judging the password correctly ornot work, dolock, alarm, lock the keyboard and other bination lock. Ithas default password function, timeout alarm function, and key lock function, error function, etc. Default password and enter the password istouse two ofthe eight latch, password isconsist parator circuit, timeout alarm function isformed byusing NE555 monostable trigger, timeout number and password error number recorded bycounting circuit, and key lock function isthrough the logical relationship ofthe circuit can control the output ofthe latch makes the server-side implementation. Keywords : Electronic lock ,Combination lock, Keyboard lock, warning circuit. II ×× 大学课程设计说明书目录 1前言.......................................................................................................................... 1 设计背景........................................................................................................... 1 设计概述........................................................................................................... 1 2 总体方案设计.......................................................................................................... 3 程序框图........................................................................................................... 3 电路分析........................................................................................................... 3 3 单元模块设计.......................................................................................................... 5 密码锁存电路................................................................................................... 5 密码判断电路...............................................