【精品】单片机课程设计.doc

摘 要 随着时代的进步和发展，单片机技术已经普及到我们生活，工作，科研，各个领域，已经成为一种比较成熟的技术,本文将介绍一种基于单片机控制的，本可以置报警温度，当温度不在设置范围内时，可以报警。采用AT89S51主控制器和美国DALLAS半导体公司推出的改进型智能温度传感器DS18B20作为检测元件。实现了对环境温度的实时监测，并能在预设的温度范围内用LED显示，同时在超过预设范围时产生报警信号。分析了温度传感器的工作原理、系统硬件电路以及软件部分的设计实际测试表明，该方案切实可行，并已在许多通信领关 键 词··············································································································· 1.方案论证 1.1.设计要求································································································5 1.2.设计方案论证························································································5 1.3.总体设计框图························································································6 2.系统组成及工作原理 2.1.单片机接口电路与DS18B20温度传感器···········································7 2.2.7断LED数码管电路及原理·······························································8 2.3.系统整体硬件电路···············································································10 3.系统软件算法分析 3.1.主程序···································································································15 3.2读出温度子程序···················································································15 3.3温度转换命令字程序············································································· 3.4计算温度子程序····················································································· 4.实验调试及测试结果分析···········································································18 5: 附录 5.1 程序··································································································· 5.2元器件清单·························································································20 引言 随着人们生活水平的不断提高,单片机控制无疑是人们追求的目标之一，它所给人带来的方便也是不可否定的，其中数字温度计就是一个典型的例子，但人们对它的要求越来越高，要为现代人工作、科研、生活、提供更好的更方便的设施就需要从单片机技术入手，一切向着数字化控制，智能化控制方向发展。本设计所介绍的数字温度计与传统的温度计相比，具有读数方便，测温范围广，测温准确，其输出温度采用数字显示，主要用于对测温比较准确的场所，或科研实验室使用，该设计控制器使用单片机AT89S51，测温传感器使用DS18B20，用位共极LED数码管实现温度显示,能准确达到以上要求。2 总体设计方案.2.1数字温度计设计方案论证方案一由于本设计是测温电路，可以使用热敏电阻之类