毕业设计（论文）-基于DS18B20的便携式数字温度计的设计.doc

目 录 摘要 前言 第1章 方案论证·······························································································( 4 ) 1.1 单片机的选用·····························································································( 4 ) 1.2 显示接口的选定·························································································( 4 ) 1.3 驱动方案的选定·························································································( 4 ) 第2章 硬件结构·······························································································( 5 ) 2.1 DS18B20的介绍及工作原理······································································( 5 ) 2.1.1 DS18B20简介··························································································( 5 ) 2.1.2 DS18B20的内部结构··············································································( 5 ) 2.1.3 DS18B20的测温过程··············································································( 7 ) 2.1.4 单线总线系统·························································································( 7 ) 2.2 AT89C2051单片机的介绍··········································································(10) 2.3 74LS244的介绍··························································································(11) 2.4 7406的介绍································································································(12) 2.5七段LED数码显示器的介绍······································································(12) 第3章 硬件控制电路设计···············································································(13) 第4章 软件控制程序的设计···········································································(14) 第5章 电路板的制作与调试···········································································(17) 5.1 注意事项···································································································(17) 5.2 绘制电路原理图和PCB板·······································································(17) 5.3 焊接······················