电气自动化论文编号:ZD974    论文字数:14810,页数:52

目 录
摘要………………………………………………………………………… . ………I
1 前言………………………………………………………………………………………1
2 系统总体设计………………………………………………………………………… .2
2.1  系统设计框图………………………………………………………………2
2.2  系统方案选择……………………………………………………………….2
 2.2.1  单片机的选择……………………………………………………….2
 2.2.2  传感器的选择……………………………………………………….3
 2.3  系统部件功能简介………………………………………………………4
     2.3.1  AT89S51功能简介…………………………………………………….4
     2.3.2  DS18B20功能简介……………………………………………………7
3 系统电路设计…………………………………………………….11
 3.1  系统电路图…………………………………………………………………11
 3.2  硬件设计………………………………………………………………………11
  3.2.1  晶振电路………………………………………………11
  3.2.2  复位电路……………………………………………………………….12
  3.2.3  电源稳压电路………………………………………………………12
        3.2.4  程序下载电路………………………………………………………13
        3.2.5  温度采集电路………………………………………………………13
        3.2.6  温度显示电路………………………………………………………14
 3.3  软件设计……………………………………………………… ……14
     3.3.1  系统主程序设计……………………………………………………14
     3.3.2  程序调试………………………………………………18
4  Protel99原理图设计……………………………………………………………… 20
 4.1  使用Protel进行电路板设计…………………………………………………………20
 4.2  用PCB系统设计PCB板……………………………………………………………21
5  总结………………………………………………………………………………….23
致谢……………………………………………………………………………………24

摘  要
 随着社会的进步和工业技术的发展，人们越来越重视温度因素，许多产品对温度范围要求严格，而目前市场上普遍存在的温度检测仪器大都是单点测量，同时还有温度信息传递不及时、精度不够的缺点，不利于工业控制者根据温度变化及时做出决定。在这样的形式下，开发一种能够同时测量多点，并且实时性高、精度高，能够综合处理多点温度信息的测量系统就很有必要。探讨工业场合温度测量处理方法及系统构成。本课题以AT89S51单片机系统为核心，能对多点的温度进行实时巡检。根据数字温度传感器DS18B20的特点，构成温度测量系统。利用简单的接口与单片机组成一个温度测量系统，通过LED显示数码管对系统进行显示，给出用DS18B20和AT89S51单片机构成的温度测量系统的应用电路和参考程序。利用DS18B20的单总线结构，占用系统的端口少，非常适合远距离多点温度检测系统。

关键词: 单片机、DS18B20、温度测量

Abstract
As the industry and the society developing, the temperature becomes more and more important and a lot of products are sensitive to temperature. However, temperature-measuring apparatus in the market now only can check and measure the temperature of one point, at the same time, the temperature information is not real time and the precision is low. It takes a great of troubles for the industry-controllers to make decision. In this situation, design and implement one applicable system which can watch measure and control the temperature and the measuring results is real time and the precision is great is more essential. In order to meeting this application, this paper talk about The Multiple-Point’s temperature Measuring System.Exploring the methods and system structure of temperature measurement in industrial situation. This system based on single chip computer, can inspect and control multiple temperatures in real time. Methods Forming temperature measurement system by means of digital temperature sensor DS18B20. Creating a temperature measurement system by using simple I/O port and single chip microcomputer which has LED, and providing the applied circuit and reference program by means of DS18B20 and AT89S51. According to the structure characteristics of DS18B20, which occupy less system ports. This temperature measurement system is appropriate to tem perature test system based on long-distance and multi-ports.
 
Keywords: single chip computer、DS18B20、temperature-measuring