基于LabVIEW和DS18B20的多点温度测量系统—下位机部分毕业设计论文.doc

内蒙古科技大学毕业设计说明书（毕业论文） 基于LabVIEW和DS18B20的多点温度测量系统—下位机部分 摘 要 温度检测在各种不同类型的环境中有着广泛的应用，但目前多数温度测量的管理水平仍停留在人工观测、记录数据、人工控制的较低水平，往往无法做到实时自动控制，离无人值守的自动化水平还有较大差距。而且在传统的模拟信号远距离温度测量系统中，需要很好的解决引线误差补偿问题、多点测量切换误差问题和放大电路零点漂移误差问题等技术问题，才能够达到较高的测量精度。 为此，针对温度控制的发展现状和事实，设计一套基于LabVIEW和DS18B20的多点温度测量系统。LabVIEW和DS18B20作为虚拟仪器和数字式传感器的代表，它们自身所具有的优良性能很好的解决了传统测温存在的问题。 在本设计中，设计内容为系统的下位机部分。下位机以AT89C52单片机为控制核心，实现的功能为控制DS18B20数字式传感器对温度进行多点测量，测量的结果通过LCD1602液晶显示器进行输出显示，对超出设置范围的温度测量结果通过蜂鸣器和发光二级管进行报警，并实现通过RS-232串口与上位机进行通信的功能，将采集的温度数据信息上传到上位机进行存档、分析。 关键词：LabVIEW；DS18B20；多点温度测量；单片机控制 内蒙古科技大学毕业设计说明书（毕业论文） The measurement system of multi-points temperature based on LabVIEW and DS18B20—the part of slave computer Abstract Temperature testing has widespread use in different environment. However, the current management level of temperature testing which still stop at the lower level of manual observation, data recording and manual control couldn’t control automatically, and it is still far from the unmanned automation standard. When conventional analog signals removing from temperature measurement system, it would achieve a higher precision of measurement if the technical problems about the errors of down-lead compensation, multi-points measurement to cut over and amplifying circuit zero drift can be solved very well. For these reasons, aiming at the current development situation, the multi-points temperature measurement system based on LabVIEW and DS18B20 will be designed and shown. LabVIEW and DS18B20, the representatives of virtual instrument and digital sensing device, have their own qualities to solve the problems of traditional temperature measurement. The part of slave computer is the main content of this design. In the slave computer, AT89C52singlechip is the controller’s core and its function is that the control DS18B20 digital sensing device tests the temperature with multi-points way. The result of test will be displayed through LCD1602. If the temperature is out of the installed range, th