毕业设计（论文）-基于AT89C51单片机密码锁设计精选.doc

摘要 本毕业设计介绍了基于单片机电子密码锁的设计，该设计硬件主要由AT89C51最小系统、矩阵电路、LCD显示电路、电源电路和报警电路等几部分组成。软件主要由C语言编程。该密码锁由单片机技术，通过矩阵电路设置、修改密码、保护密码，并由LCD显示密码输入，从而实现对密码的设置、保护。 关键词：AT89C51单片机； 密码； 报警； LCD Abstract The graduation design introduced electronic locks based on single chip design, this design hardware mainly by AT89C51 minimum system, the matrix circuit, LCD display circuit, the power supply circuit and alarm circuit to wait for a few parts. Software is mainly by the C programming language. This combination lock by single chip microcomputer, set up by the matrix circuit, cipher amending and password protection, and the LCD display password input, so as to achieve the password set, protection Keywords: at89c51SCM； Password； Alarm；LCD 目录 绪论.............................................................1 1.1 密码锁的背景及意义..............................................1 电子密码锁的发展趋势...........................................1 1.3设计方案的确定..................................................2 1.3.1 系统的内容及具体要求..........................................2 1.3.2 总体方案的选定................................................2 2 系统组成与原理图..................................................3 2.1 系统的组成......................................................3 2.2 系统工作原理....................................................4 3 系统硬件设计......................................................5 3.1 AT89C51的简介...................................................5 3.1.1 主要参数......................................................5 3.1.2 引脚功能说明..................................................6 3.1.3 单片机最小系统................................................8 3.1.3.1晶振时钟电路................................................8 3.1.3.2复位电路的..................................................9 3.2 液晶显示器LCD的简介...........................................10 3.3 电源电路的.....................................................11 3.4 矩阵键盘.......................................................12 3.5 LC