數(shù)字式溫濕度智能檢測系統(tǒng)的設計 畢業(yè)論文

數(shù)字式溫濕度智能檢測系統(tǒng)的設計
 摘要 溫濕度的測量在倉儲管理、工業(yè)生產(chǎn)制造、智能建筑、科學研究及日常生活中被廣泛應用，并且隨著計算機技術的飛速發(fā)展和廣泛應用，現(xiàn)代工業(yè)生產(chǎn)與計算機技術聯(lián)系的越來越緊密，借助當今計算機的快速綜合處理能力，實施對溫濕度的計算機監(jiān)控，對降低生產(chǎn)安全因素，提高勞動效率，改善生產(chǎn)環(huán)境有很重要的積極作用。本系統(tǒng)采用技術成熟的SHT11芯片作為測量濕度和溫度的傳感器?？刂葡到y(tǒng)芯片采用技術成熟，功能強大、價位低廉大眾化的AT89C51單片機。硬件采抗干擾措施采用集成看門狗芯片DS1232，它使系性能得到了改善。由本設計課題做成的溫濕度檢測系統(tǒng)結構簡單、價格便宜、量程寬，具有較高的可靠性、安全性及實用性。

關鍵詞  單片機，SHT11，溫濕度檢測

The design of Digital Temperature and Humidity Intelligent Measurement System
Abstract  This paper has designed an intelligent temperature and humidity measurement system with many measuring points. With the new science and technology increasingly, our society has made great progress! In the industrial and agricultural production，meteorology，environmental，national defense，scientific research，aerospace，and other departments, it is usually necessarily to measure and control the environmental temperature and humidity. The virtual network rapid development of a more long-range temperature and humidity control of the increasingly mature. This system uses the technology mature SHT11 as temperature and humidity-measuring the sensor. The control use technology is mature，low price of the popular AT89C51，the keyboard instruments/monitors，switch control，alarm circuits and are directly linked AT89C51.The watchdog circuit hardware is used to anti-interference，using a software command redundant technology，so that they have improved in performance. In the design, the errors of factors have also carried out some theoretical analysis to prove that this design is feasible. The issue posed by the design of more than make the temperature and humidity monitoring system is simple，cheap，wide range，a higher degree of reliability，safety and practicality.
Keywords  Single Chip, SHT11, Temperature and Humidity Sensors

 
目錄
第一章 引言 1
1.1  研究意義 1
1.2  國內外發(fā)展趨勢 1
1.3  系統(tǒng)的主要性能指標 2
1.4  主要工作任務 2
第二章  系統(tǒng)方案選擇和工作原理 3
2.1  系統(tǒng)綜述 3
2.2  系統(tǒng)設計方案 3
2.3  系統(tǒng)工作原理 3
第三章 系統(tǒng)硬件設計 5
3.1  單片機的選擇 5
3.1.1  晶振回路 5
3.1.2  復位電路 6
3.2  溫濕度傳感器的選擇 8
3.2.1  SHT11的工作原理 9
3.2.2  SHT11的傳輸特性 11
3.2.3  I2C總線簡介 12
3.3  溫濕度測量回路的設計 13
3.4  顯示電路設計 14
3.5  報警電路設計 15
3.6  電源電路設計 16
第四章 系統(tǒng)的軟件設計 18
4.1主程序的設計 18
4.2  I2C模塊程序設計 21
4.3  LED顯示程序設計 23
4.4  報警電路程序設計 24
第五章 系統(tǒng)抗干擾措施 25
5.1  硬件抗干擾措施 25
5.2  軟件抗干擾措施 26
第六章 結論 28
致謝 29
參考文獻 30
附錄A  系統(tǒng)原理圖 31