#基于单片机的数字温度计设计60543.doc

单片机课程设计报告 "题 目： "基于单片机的数字温 " " "度计设计 " "教 学 系： "*** " "年 级、专 业： "2010级电子科学和技 " " "术（1）班 " "姓 名 学 号： "*** " " "*** " " "*** " "指 导 教 师： "*** " "完 成 时 间： "2012年6月 " 基于单片机的数字温度计设计 作者：*** 指导老师： *** （年级专业：2010级电子科学和技术一班） 摘 要：本文介绍一种基于AT89S52单片机的一种温度测量及报警电路,该电路采用DS18B20作 为温度监测元件，测量范围-55 - ～+125 ，使用4位LED模块显示，能通过键盘设置温度报警上下限。正文着重给出了软硬 件系统的各部分电路，介绍了集成温度传感器DS18B20的原理，AT89S52单片机功能和使 用。该电路设计新颖、功能强大、结构简单。 关键词：温度测量 DS18B20 AT89S52 Abstract : The introduction of a cost-based AT89S52 MCU a temperatur measurement circuits, the circuits used DS18B20 high-precision temperatur sensor , measuring scope -55 -～+125 ,can use the keybord set the warning limitation, the use of four bits seven segments LED that can be display the current temperature. The paper focuses on providing a software and hardware system components circuit, introduced the theory of DS18B20, the founctions and applications of AT89S52 .This circuit design innovative, powerful, can be expansionary strong. Key Words : Temperatur measurement DS18B20 AT89S52 目 录 1前言······························································3 2方案设计··························································3 3 系统的硬件设计····················································4 3.1 主控制器························································4 3.2 显示电路························································5 3.3 温度传感器工作原理··············································6 3.4 温度传感器接口电路··············································9 4 系统的软件设计····················································9 4.1 主程序··························································9 4.2 温度测量························································9 4.2.1 初始化DS18B20················································9 4.2.2 等待应答信号·················································10 4.2.3 DS18B20读字节···············································10 4.2.4 DS18B20写字节················································11 4.2.5 启动温度测量·················································12 4.2.6 读取测量结