高精度数字体温计的设计毕业论文.doc

湖南人文科技学院 本科生毕业设计档案材料 题 目：高精度数字体温计的设计 学生姓名：曾鹏飞 学号系 部： 通信与控制工程系 专业年级： 08级电子信息工程二班 指导教师： 刘宗良 职 称： 教授 湖南人文科技学院教务处制 DS18B20数字体温计的设计 摘 要本论文介绍了一种以单片机为主要控制器件，以DS18B20为体温传感器的新型数字体温计。主要包括硬件电路的设计和系统程序的设计。硬件电路主要包括主控制器，测温电路和显示电路等，主控制器采用单片机AT89C，体温传感器采用美国DALLAS半导体公司生产的DS18B20显示电路采用8位共极LED数码管动态扫描直读显示。系统程序主要包括主程序，温子程序显示子程序等。由于采用了改进型智能体温传感器DS18B20作为检测元件，与传统的体温计相比,本数字体温计减少了外部的硬件电路，具有低成本和易使用的特点。DS18B20体温计还可以在高温报警、远距离多点测温控制等方面进行应用开发，具有很好的发展前景。此外，还介绍了系统的调试和性能分析。关键词显示电路单片机AT89C52，体温传感器DS18B20 ,单总线 The Design of DS18B20 Digit Thermometer ABSTRACT Temperature is a basic parameters of the environment, peoples lives and the environment are closely related to temperature. in the course of industrial production immediate need for temperature measurement in industrial production has to do with temperature measurement, The study of the temperature measurement and control is of great significance.  The?paper?introduced one kind?new?digital thermometer that take the Micro Controller Unit as the primary control component and take?DS18B20 as the temperature?sensor. Mainly?included the design of the hardware electric circuit and the design of the system program .The hardware electric circuit mainly included the master controller, the temperature measured electric circuit and the display circuit and so on, the master controller used Micro Controller Unit AT89C52, the temperature sensor used DS18B20 which the American DALLAS semiconductor company?produces, the display circuit used 8 altogether anodes LED numerical code tube by the dynamic scanning?method straight to read the demonstration.ULN2803A-driven dynamic scan showed straight time. Temperature control circuit from temperature sensors and preset temperature value compared alarm circuit components, When measured temperature greater than preset temperature value, issued warning signal that the bright light emitting diodes. The system program mainly include