目 录
1 引言 ...........................................................................................................................2
1.1 目的和意义 .......................................................................................................2
1.2 研究概况及发展趋势综述 ...............................................................................3
1.3 本系统主要研究内容 .......................................................................................4
2. 总体方案论证与设计 .................................................................................................5
2.1 主控模块的选型和论证 ....................................................................................5
2.2 显示模块的选型和论证 ....................................................................................5
2.3 传感器的选型和论证 ........................................................................................5
2.4 时钟芯片的选型和论证 ....................................................................................6
2.5 系统整体设计概述 ............................................................................................6
3.系统硬件电路设计 .......................................................................................................7
3.1 主控模块 ............................................................................................................7
3.1.1 STC89C52 单片机主要特性 ..................................................................7
3.1.2 STC89C52 单片机的中断系统 ............................................................10
3.1.3 单片机最小系统设计 ..........................................................................10
3.2 LCD 液晶显示器简介 .....................................................................................10
3.2.1 液晶原理介绍 ......................................................................................10
3.2.2 液晶模块简介 .......................................................................................11
3.2.3 液晶显示部分与 STC89C52 的接口 ...................................................12
3.3 键盘模块设计 ..................................................................................................12
3.4 蜂鸣器模块设计 ..............................................................................................13
3.5 信号采集电路设计 ..........................................................................................13
3.5.1 传感器简介 ........................................................................................13
3.5.2 放大电路 ............................................................................................14
3.5.3 整形电路 ............................................................................................14
3.5 时钟模块的设计 ..............................................................................................14
3.5.1 DS1302 概述 .........................................................................................15
3.5.2 DS1302 内部 RTC 和 RAM 地址分配 ..............................................17
3.5.3 DS1302 时钟电路设计 .........................................................................19
4.系统软件设计 .............................................................................................................21
4.1 系统软件总体设计 ..........................................................................................21
4.2 程序设计原理 ..................................................................................................22
5.系统调试 .....................................................................................................................23
5.1 硬件调试 ..........................................................................................................23
5.2 软件调试 ..........................................................................................................23
5.3 调试结果 ..........................................................................................................23
6.结论 .............................................................................................................................24
附录 ................................................................................................................................26
系统整体原理图 ............................................................................................................26
元件清单 ........................................................................................................................26
系统源程序 ....................................................................................................................28
