大棚實(shí)時(shí)監(jiān)控系統(tǒng)設(shè)計(jì)

目 錄

摘要……………………………………………………………………………………………1
關(guān)鍵詞…………………………………………………………………………………………1
Abstract……………………………………………………………………………………1
Key words……………………………………………………………………………………1
0 引言 2
0.1 課題的意義 2
0.2 國內(nèi)外研究現(xiàn)狀 2
0.2.1 國外的研究進(jìn)展 2
0.2.2 國內(nèi)的研究進(jìn)展 2
0.3 本文研究的主要內(nèi)容 2
1 系統(tǒng)總體設(shè)計(jì) 3
1.1 系統(tǒng)功能設(shè)計(jì) 3
1.2 系統(tǒng)的組成與工作原理 3
1.2.1 系統(tǒng)的組成 3
1.2.2 系統(tǒng)的工作原理 4
1.2.3系統(tǒng)的硬件原理圖 4
2 硬件電路設(shè)計(jì) 5
2.1 傳感器設(shè)計(jì) 5
2.1.1 DS18B20數(shù)字溫度傳感器概述 5
2.1.2 DS18B20的性能特點(diǎn) 5
2.1.3 DS18B20的管腳排列 5
2.1.4 1－wire技術(shù) 5
2.1.5 DS18B20的內(nèi)部結(jié)構(gòu) 6
2.1.6 DS18B20的時(shí)序 7
2.1.7 DS18B20的控制方法 9
2.1.8 DS18B20的測(cè)溫原理 9
2.2單片機(jī)設(shè)計(jì) 10
2.2.1 AT89C51芯片的主要性能 10
2.2.2 AT89C51芯片的引腳說明 11
2.3 時(shí)鐘晶振電路和復(fù)位電路 12
2.4 數(shù)碼管輸出 13
2.5 RS－232通信設(shè)計(jì) 14
2.5.1 串行通信的分類 14
2.5.2 串行通信的制式 15
2.5.3 RS－232接口標(biāo)準(zhǔn) 15
2.5.4 RS－232的硬件設(shè)計(jì) 16
3系統(tǒng)的軟件設(shè)計(jì) 17
3.1 系統(tǒng)軟件設(shè)計(jì)的內(nèi)容 17
3.2 主程序設(shè)計(jì) 17
3.3 DS18B20初始化子程序設(shè)計(jì) 19
3.4寫時(shí)序子程序設(shè)計(jì) 19
3.5 顯示子程序設(shè)計(jì) 21
4 系統(tǒng)的仿真與編譯 22
4.1 程序在Keil中編譯 22
4.2 系統(tǒng)在Proteus中的仿真 23
4.3 實(shí)物的制作 25
5 結(jié)論 27
致 謝 ………………………………………………………………………………27
參考文獻(xiàn)………………………………………………………………………………28
附 錄 ………………………………………………………………………………29
 
大棚實(shí)時(shí)監(jiān)控系統(tǒng)設(shè)計(jì)

摘要：我國農(nóng)業(yè)正處于從傳統(tǒng)農(nóng)業(yè)向現(xiàn)代化農(nóng)業(yè)轉(zhuǎn)化的新階段，而現(xiàn)代農(nóng)業(yè)生產(chǎn)離不開環(huán)境控制，本文在對(duì)國內(nèi)外大棚智能控制進(jìn)行深入分析的基礎(chǔ)上，提出一種基于單片機(jī)并采用數(shù)字化單總線技術(shù)的溫度測(cè)控系統(tǒng)應(yīng)用于大棚的設(shè)計(jì)方案，該方案是利用溫度傳感器DS18B20將大棚內(nèi)溫度的變化，變換成電流的變化，再轉(zhuǎn)換為電壓變化輸入模數(shù)轉(zhuǎn)換器，其值由單片機(jī)處理，最后由單片機(jī)去控制數(shù)字顯示器，顯示大棚內(nèi)的實(shí)際溫度。這種設(shè)計(jì)方案能對(duì)多點(diǎn)的溫度進(jìn)行實(shí)時(shí)巡檢，各檢測(cè)單元能獨(dú)立完成各自功能，同時(shí)能夠根據(jù)主控機(jī)的指令對(duì)溫度進(jìn)行定時(shí)采集。另一方面，本系統(tǒng)通過RS-232總線與監(jiān)控計(jì)算機(jī)通信，將采集到的數(shù)據(jù)傳輸給監(jiān)控計(jì)算機(jī)。監(jiān)控計(jì)算機(jī)將單片機(jī)傳輸?shù)臄?shù)據(jù)進(jìn)行記錄、存儲(chǔ)、處理和報(bào)警，供工作人員瀏覽、記錄和進(jìn)行相關(guān)處理。
關(guān)鍵詞：單片機(jī)；單總線技術(shù)；DS18B20；上位機(jī)；下位機(jī)

The Design of the Real-time Monitoring System of Greenhouse

Abstract: China is now during the new stage that traditional agriculture changes to modern, and modern agricultural production is inseparable from the environmental control. Based on thorough analysis about our national and abroad greenhouse intelligent control, this paper gives a greenhouse temperature control project which is based on the SCM and digital mono bus technology. In this project, the change of temperature in the greenhouse is transformed into the change of electric current and then into the change of voltage by using the temperature sensors. The change of voltage is input into the A/D conversion units and the result is dealt with by SCM. At last the real time temperature in the greenhouse is displayed on the monitor under the control of SCM. This project can make real time patrol checking to the different nod’s temperature in the greenhouse, and every separate checking unit can finish its task independently. At the same time, every separate checking unit can make timing collecting according to the instruction from the main control. On the other hand, the MCU transmits the gathered data to monitoring computer by the means of the communication between 232-bus and monitoring computer. The monitoring computer will record, store, process and alarm the data, so that the operators can browse and record it, then take relative measures.
Key words: SCM; Mono bus technology; DS18B20; Host system; Slave system