目录
摘要……...............................................................................................................I
Abstract................................................................................................................II
第 1 章 绪论 ........................................................................................................1
1.1 课题背景 ...................................................................................................1
1.2 国外温度测量技术的发展情况 ...............................................................1
1.3 国内温度测量技术的发展情况 ...............................................................2
1.4 论文研究内容 ...........................................................................................2
第 2 章 传感器及相关器件介绍 ........................................................................4
2.1 温度传感器的选择 ...................................................................................4
2.1.1 DS18B20 温度传感器简介 ................................................................4
2.1.2 DS18B20 的性能特点 ........................................................................5
2.1.3 DS18B20 的管脚排列 ........................................................................5
2.1.4 DS18B20 的内部结构 ........................................................................6
2.1.5 DS18B20 的测温原理 ........................................................................8
2.1.6 DS18B20 的时序 ................................................................................9
2.1.7 DSl8B20 使用中的注意事项 ...........................................................10
2.2 单片机概述 .............................................................................................10
2.2.1 AT89C51 芯片主要性能 ..................................................................11
2.2.2 AT89C51 芯片的内部结构框图 ......................................................12
2.2.3 AT89C51 芯片的引脚说明 .............................................................12
2.2.4 使用 AT89C51 编程时需注意事项 ................................................16
2.3 显示电路的组成器件 .............................................................................17
2.3.1 LED 显示器的介绍 ..........................................................................17
2.3.2 74LS164 芯片的介绍 .......................................................................17
2.4 本章小结 .................................................................................................19
第 3 章 系统硬件电路设计 ..............................................................................21
3.1 系统硬件电路构成 .................................................................................21
3.1.1 系统整体电路及测温原理 ..............................................................21
3.1.2 DS18B20 的控制方法 ......................................................................23
3.1.3 显示电路的连接 ..............................................................................25
3.2 系统主要技术指标 .................................................................................26
3.3 本章小结 .................................................................................................26
第 4 章 系统软件的设计 ..................................................................................27
4.1 主程序设计 .............................................................................................27
4.2 测温子程序 .............................................................................................28
4.3 显示子程序 .............................................................................................29
