基于 STC89C52 单片机的多点温度检测系统设计
目 录
摘 要...........................................................................................................................................................I
Abstract .......................................................................................................................................................II
目 录........................................................................................................................................................III
第一章 绪 论 .......................................................................................................................................1
1.1 本课题研究意义 ...............................................................................................................................1
1.2 本课题研究现状 ...............................................................................................................................1
1.3 本课题设计任务及要求 ...................................................................................................................1
第二章 Proteus 仿真软件.................................................................................................................3
2.1 proteus 单片机仿真软件简介 ..........................................................................................................3
2.2 Proteus 仿真过程说明 .......................................................................................................................4
第三章 系统总体方案设计.............................................................................................................7
3.1 系统总体设计 ....................................................................................................................................7
3.2 方案原理说明 ....................................................................................................................................8
3.3 总体设计方案论证 ............................................................................................................................8
第四章 硬件电路的设计..................................................................................................................9
4.1 测温电路的设计 ...............................................................................................................................9
4.1.1 热敏电阻的选择 .....................................................................................................................9
4.1.2 测温电路的方案论证 ...........................................................................................................10
4.2 A/D 转化电路的设计 .....................................................................................................................12
4.2.1 方案论证 ..............................................................................................................................12
4.2.2 ADC0809 芯片的引脚功能..................................................................................................13
4.2.3 ADC0809 与单片机的连接..................................................................................................14
4.3 主控模块 STC89C52 ......................................................................................................................15
4.3.1 STC89C52 简介 ....................................................................................................................15
4.3.2 单片时钟电路的设计 ...........................................................................................................16
4.3.3 单片机复位电路设计 ...........................................................................................................16
4.4 扩展 I/O 接口芯片..........................................................................................................................17
4.4.1 方案论证 ...............................................................................................................................17
4.4.2 芯片引脚功能介绍 ...............................................................................................................17
4.4.3 8255A 与单片机连接 ...........................................................................................................18
4.5 显示电路的设计 ..............................................................................................................................18
