基于單片機的溫度測量系統研制

電氣自動化論文編號:ZD974    論文字數:14810,頁數:52

目 錄
摘要………………………………………………………………………… . ………I
1 前言………………………………………………………………………………………1
2 系統總體設計………………………………………………………………………… .2
2.1  系統設計框圖………………………………………………………………2
2.2  系統方案選擇……………………………………………………………….2
 2.2.1  單片機的選擇……………………………………………………….2
 2.2.2  傳感器的選擇……………………………………………………….3
 2.3  系統部件功能簡介………………………………………………………4
     2.3.1  AT89S51功能簡介…………………………………………………….4
     2.3.2  DS18B20功能簡介……………………………………………………7
3 系統電路設計…………………………………………………….11
 3.1  系統電路圖…………………………………………………………………11
 3.2  硬件設計………………………………………………………………………11
  3.2.1  晶振電路………………………………………………11
  3.2.2  復位電路……………………………………………………………….12
  3.2.3  電源穩壓電路………………………………………………………12
        3.2.4  程序下載電路………………………………………………………13
        3.2.5  溫度采集電路………………………………………………………13
        3.2.6  溫度顯示電路………………………………………………………14
 3.3  軟件設計……………………………………………………… ……14
     3.3.1  系統主程序設計……………………………………………………14
     3.3.2  程序調試………………………………………………18
4  Protel99原理圖設計……………………………………………………………… 20
 4.1  使用Protel進行電路板設計…………………………………………………………20
 4.2  用PCB系統設計PCB板……………………………………………………………21
5  總結………………………………………………………………………………….23
致謝……………………………………………………………………………………24

摘  要
 隨著社會的進步和工業技術的發展，人們越來越重視溫度因素，許多產品對溫度范圍要求嚴格，而目前市場上普遍存在的溫度檢測儀器大都是單點測量，同時還有溫度信息傳遞不及時、精度不夠的缺點，不利于工業控制者根據溫度變化及時做出決定。在這樣的形式下，開發一種能夠同時測量多點，并且實時性高、精度高，能夠綜合處理多點溫度信息的測量系統就很有必要。探討工業場合溫度測量處理方法及系統構成。本課題以AT89S51單片機系統為核心，能對多點的溫度進行實時巡檢。根據數字溫度傳感器DS18B20的特點，構成溫度測量系統。利用簡單的接口與單片機組成一個溫度測量系統，通過LED顯示數碼管對系統進行顯示，給出用DS18B20和AT89S51單片機構成的溫度測量系統的應用電路和參考程序。利用DS18B20的單總線結構，占用系統的端口少，非常適合遠距離多點溫度檢測系統。

關鍵詞: 單片機、DS18B20、溫度測量

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