蔬菜大棚溫濕度智能控制系統

論文編號:ZD1289  論文字數:23321,頁數:70  附開題報告，外文翻譯，大圖

摘要

  本設計是基于單片機控制的蔬菜大棚溫濕度智能控制系統，主體由單總線溫度傳感器DS1820、A89C51單片機、數據存儲器6264、8255接口芯片，濕度傳感器、報警電路以及鎖存器74LS373構成。此系統具有運行速度快，傳感器安裝便利，精度高，穩定性強等優點，其最主要技術運用了單總線傳輸。此系統不僅僅適用于蔬菜大棚的溫度控制，也適用于一些對溫度要求較高的工藝，可以廣泛應用于這些工業生產，普及性較強。此系統對蔬菜大棚進行多點溫度巡回檢測控制，而且能自動判斷溫度是否超標，并且可以智能的控制相關設備的啟動，可靠性比較強。
 本設計由硬件和軟件兩大部分構成。其硬件電路部分的設計包括：單片機的選擇、數字和模擬量通道的設計以及溫濕度測量和報警電路的設計部分。軟件又包括主程序，單總線通信協議子程序，DS1820讀寫子程序、顯示刷新子程序、報警處理子程序等。
關鍵詞：單總線；單片機；溫濕度控制；DS1820；數據存儲器；鎖存器
 
 

ABSTRACT

 The design which controls the humidity and temperature of the greenhouse is based on the single chip computer. Its body is made up of the temperature sensor DS1820, the single chip computer A89C51, the data-carrier storage 6264, the connection chip 8255, the humidity sensor, the alarm circuit and latch 74LS373. This system has some advantages, such as the high running speed, the convenient installment of the sensor, the high precision, the good stability and so on. And its main technology is the 1-wire transmission. This system is not only suitable for the temperature control of vegetables greenhouse, but also for the technology of some higher requests to the temperature, and it may widely apply to these industrial productions, and it has good popularization. This system carries on the multi-spots temperature tour test control to the vegetables greenhouse, and can automatically judge the temperature whether it exceeds the allowed figure, and may start up the intelligent control equipment, and it has a good reliability.
 The system is composed of the hardware and software. The design of the hardware circuit includes: the choice of single chip computer, the design of the I/O and A/D, the test of the humidity and temperature and the design of the alarm circuit. The software part includes: the main procedure, the subroutine of the correspondence agreement of the 1-wire, the DS1820 read-write subroutine, the subroutine of the demonstration renovates, the subroutine of the alarm processing and so on.
Keyword: 1-wire; single chip computer; temperature and humidity control; DS1820; Data-carrier storage; Latch

目錄

引言………………………………………………………………………1
1 概述…………………………………………………………………2
1.1 溫室計算機控制的概況…………………………………………2
1.2 用戶對該系統的要求……………………………………………2
1.3 系統的硬件組成框圖……………………………………………2
1.4 系統的工作原理…………………………………………………3
2 系統的硬件組成電路設計…………………………………………4
2.1 系統主控制器部分設計…………………………………………4
2.2 數據存儲器的擴展………………………………………………10
2.3 主控制器的并行接口擴展………………………………………12
2.4 LED顯示器………………………………………………………14
2.5 A/D轉換接口……………………………………………………16
3 一總線接口…………………………………………………………22
3.1 單總線技術概述…………………………………………………22
3.2 單總線芯片的硬件結構…………………………………………23
3.3 單總線芯片的供電………………………………………………23
3.4 單總通信的ROM命令…………………………………………24
4 單總線數字溫度傳感器DS1820和濕度檢測電路………………27
4.1 DS1820概述………………………………………………………27
4.2 DS1820 的主要特性……………………………………………27
4.3 DS1820 內部結構………………………………………………27
4.4 DS1820的工作原理……………………………………………28
4.5 DS1820使用中注意事項………………………………………30
4.6 濕度檢測電路……………………………………………………30
4.7 報警電路…………………………………………………………31
5 系統的軟件設計……………………………………………………32
5.1 設計方法…………………………………………………………32
5.2 主程序的分析與說明……………………………………………32
5.3 主程序區…………………………………………………………32
5.4 子程序區…………………………………………………………35
6 電路設計中的抗干擾措施…………………………………………64
7 技術經濟分析………………………………………………………67
8 結論…………………………………………………………………68
致謝……………………………………………………………………69
參考文獻………………………………………………………………70