目 录
绪 论...........................................................................................................................................1
1 方案设计...............................................................................................................................2
1.1 总体框架的设计.........................................................................................................2
1.2 单片机开发环境的选择.............................................................................................3
1.2.1 电路图绘制软件...............................................................................................3
1.2.2 Keil_C 软件......................................................................................................4
2 硬件电路设计.......................................................................................................................6
2.1 传感器的选型.............................................................................................................6
2.2 单片机最小系统设计.................................................................................................6
2.2.1 单片机的选型...................................................................................................6
2.2.2 时钟电路与复位电路.......................................................................................8
2.2.3 单片机使用注意事项.....................................................................................10
2.3 电流电压转换电路设计...........................................................................................11
2.4 模拟量采集电路设计...............................................................................................13
2.4.1 ADC0809 概述 ...............................................................................................13
2.4.2 ADC0809 与单片机接口电路 .......................................................................15
2.5 显示电路设计...........................................................................................................16
2.5.1 LCD1602 引脚结构........................................................................................16
2.5.2 LCD1602 主要技术参数及特性....................................................................16
2.5.3 LCD1602 与单片机的接口电路....................................................................17
2.6 按键接口电路设计...................................................................................................17
2.7 报警电路设计...........................................................................................................18
2.8 串行口功能设计.......................................................................................................19
2.8.1 RS-232 串行接口 ...........................................................................................19
2.8.2 MAX232 简介 ................................................................................................20
3 软件部分设计.....................................................................................................................22
3.1 主程序工作流程.......................................................................................................22
3.2 A/D 转换子程序.......................................................................................................23
3.3 数字滤波及标度变换程序设计...............................................................................24
