集中空調系統中電氣柜濕度控制系統

論文編號:ZD1263  論文字數:19572,頁數:50  附原理圖，外文翻譯

摘   要
 
 為了解決集中空調系統電氣柜濕度過高的問題，一種采用單片機作為下位機、PC機作為上位機的濕度自動控制系統，系統采用分布式控制方式，主機選擇IBM-PC機，主機實現集中管理，主要完成各從機濕度設定值的修改，向從機發出命令，檢查從機狀態，接收從機數據并進行統計分析，顯示打印分析曲線、報表等。從機由89C51單片機擴展而成，它完成濕度數據的采集與處理、輸出控制量、顯示、報警、以及與主機通信等功能。濕度信號的采集是由HS1101和TLC556組成的濕度檢測電路來完成的，另有8255A以及LED顯示器作為顯示電路，完成顯示工作。

關鍵字：濕度控制，單片機，A/D0809

Abstract：
For solve not concentrating by air conditioner system cupboard humidity too high problem not electric, adopt each by one-chip computer as machine , the PC not the next as at humidity control system not automatic, location of machine, the system adopts the distributed control method, the host computer chooses the IBM-PC machine, the host computer realizes centralized management, finish every from machine modification , humidity of person who establish , to give an order from plane mainly, check from the state of the machine , receive from the machine data and carry on statistical analysis, show that types and analyses the curve , report form ,etc.. Expand by one-chip computer from machine by 89C51, it finish collection and treatment , humidity of data , output person who control , show , report to the police , and host computer communication ,etc. function. Collection, humidity of signal whether humidity that made up of HS1101 and TLC556 measure circuit is it finish to come, made up of 8255A and LED display and show the circuit separately , finish showing the work.

Keywords : distributed control；A/D0809 ; single chip microcomputer

目 錄
1 引言 2
2 系統概述 3
2.1 信號采集 3
2.2 顯示和報警 3
2.3 驅動控制 3
3 方案論證 4
3.1 中央處理單元CPU的選擇 4
3.1.1常見幾種單片機的比較 4
3.1.2 中央處理單元AT89C51的確定 5
3.2 傳感器的選擇 6
3.2.1 濕度傳感器的選擇 6
4 系統的組成以及輔助電路的設計 13
4.1 AT89C51的基本結構和功能簡介 14
4.2 采樣保持器和A/D轉換電路的設計 21
4.2.1 A/D轉換器ADC0809 21
4.3 濕度檢測電路設計 24
4.4設備總線的設計 26
4.5 89C51擴展口的設計電路： 28
4.6 顯示電路 29
4.6.1 顯示芯片8255A 30
4.6.2 LED數碼管 32
4.7 報警裝置 34
5 軟件設計 36
5.1 上位機簡介以及軟件設計 36
5.1.1 Visual Basic語言編程簡介 36
5.1.2 軟件實現 37
5.2 下位機軟件設計 40
總結及致謝 41
參考文獻 42
附錄1 上位機軟件程序清單 43
附錄2 下位機軟件程序清單 47