【正文】 ........................16 主電路圖 ...........................................................................................17 本章小結(jié) ..................................................................................................17 第 4 章 采集系統(tǒng)軟件設(shè)計(jì) ...............................................................................18 虛擬儀器開(kāi)發(fā)軟件 ..................................................................................18 下位機(jī)程序設(shè)計(jì) ......................................................................................19 初始化程序 .......................................................................................19 讀寫(xiě)時(shí)序函數(shù) ...................................................................................21 溫度采集模塊程序 ...........................................................................21 上位機(jī)程序設(shè)計(jì) ......................................................................................22 前面板主頁(yè)界面 ...............................................................................22 IV 前面板實(shí)時(shí)數(shù)據(jù)測(cè)控 .......................................................................23 前面板歷史記錄 ...............................................................................23 用戶登錄界面程序框圖 ...................................................................23 串口通訊程序框圖 ...........................................................................24 溫度顯示和波形顯示模塊 ...............................................................24 本章小結(jié) ..................................................................................................25 第 5 章 數(shù)據(jù)采集系統(tǒng)調(diào)試 ...............................................................................26 系統(tǒng)調(diào)試 ..................................................................................................26 系統(tǒng)評(píng)估升級(jí) ..........................................................................................28 本章小結(jié) ..................................................................................................28 結(jié)論 .....................................................................................................................29 致謝 .....................................................................................................................30 參考文獻(xiàn) .............................................................................................................31 附錄 .....................................................................................................................32 1 第 1章 緒論 課題研究背景 電壓、電流作為控制系統(tǒng)中基本物理量，是數(shù)字控制系統(tǒng)得以實(shí)現(xiàn)的前提。設(shè)計(jì)中通過(guò) LabVIEW 構(gòu)建數(shù) 據(jù)采集系統(tǒng)軟件平臺(tái)，將采集的溫度數(shù)據(jù)進(jìn)行處理并對(duì)處理結(jié)果進(jìn)行相應(yīng)判斷。 畢 業(yè) 設(shè) 計(jì) 題 目： 基于 LabVIEW 數(shù)據(jù)采集系統(tǒng)設(shè)計(jì) 院、 系： 電氣工程系 姓 名： 指導(dǎo)教師： 系 主 任： 2020 年 6 月 20 日 I 基于 LabVIEW 數(shù)據(jù)采集系統(tǒng) 設(shè)計(jì) 摘 要 工農(nóng)業(yè) 生產(chǎn)、現(xiàn)代科學(xué)研究及高新技術(shù)開(kāi)發(fā)離不開(kāi)溫度參數(shù)的測(cè)量與分析。 LabVIEW 是一種圖像化的編程語(yǔ)言，在數(shù)據(jù)采集和儀器控制上得到了學(xué)術(shù)界、工業(yè)界認(rèn)可，為實(shí)現(xiàn)儀器編程和數(shù)據(jù)采集系統(tǒng)提供了方便的途徑。 關(guān)鍵詞 LabVIEW； 溫濕度傳感器 （ DHT11） ； 溫度傳感 （ DS18B20） II Design of Data Acquisition System Based on LabVIEW Abstract The measurement and analysis of the temperature parameters of the industrial and agricultural production, the modern scientific research and the hightech development. In modern times, the electronic measurement technology is developing towards the high degree of integration, low power consumption, programming and the direction of digital, traditional pointer type temperature indicator of temperature parameters of digital processing and sharing. This design introduces a kind of based on LabVIEW programmingsoftware data acquisition system design scheme, the scheme uses the temperature sensor DS18B20 as temperature gathering media processor STC89C52 as the control chip of the temperature acquisition module. provides a convenient way for the realization of the instrument programming and data acquisition system. Through the LabVIEW, the software platform of the data acquisition system is built, the temperature data is processed and the corresponding judgment is made. The system design has the practical value, industrial and agricultural production, science and technology research, public transportation and activity place and so on domain temperature data collection work. After the pletion of the system design of performance test, show that the system is capable to was measured that the environment to plete the realtime data acquisition, storage, signal analysis and realtime graphical display work, the system design is simple, good versatility, portability, easy operation, low product can meet part of the market demand. Keywords LabVIEW； TemperatureHumidity sensor； Temperature sensor(DS18B20) III 目 錄 摘 要 ............................................................................................................... I Abstract ................................................................................................................ II 第 1 章 緒論 .........................................................................................................1 課題研究背景 ............................................................錯(cuò)誤 !未定義書(shū)簽。 在生活中，溫度的顯著變化超出人的適應(yīng)范圍導(dǎo)致身體不適，容易引發(fā)感冒、中暑等癥狀。根據(jù)熱力學(xué)第二定律，兩個(gè)溫度相同的系統(tǒng)之間可以通過(guò)一定控制技術(shù)達(dá)到熱平衡的，利用與目標(biāo)系統(tǒng)溫度同步的隔離層，實(shí)現(xiàn)目標(biāo)系統(tǒng)與外界進(jìn)行熱隔離 [1]。 從第一臺(tái)計(jì)算機(jī)出現(xiàn)至今應(yīng)有 60 年歷史，計(jì)算機(jī)應(yīng)用由最初的國(guó)防事業(yè)蔓延至各行各業(yè)，加上電子技術(shù)、軟件技術(shù)、網(wǎng)絡(luò)技術(shù)和現(xiàn)代測(cè)量技術(shù)的發(fā)展，為現(xiàn)代測(cè)量技術(shù)發(fā)展提供了技術(shù)保障。 傳統(tǒng)儀器由儀器設(shè)備生產(chǎn)廠商根據(jù)市場(chǎng)需求開(kāi)發(fā)出滿足用戶需求的專用儀器，具有輸入輸出接口和儀器控制面板，該儀器呈現(xiàn)給用戶的表現(xiàn)為功能單一，測(cè)試環(huán)境封閉。例如一些技術(shù)水平不高，經(jīng)濟(jì)實(shí)力弱的公司在進(jìn)行產(chǎn)品分析時(shí)，對(duì)于購(gòu)置高檔臺(tái)式儀器如數(shù)字示波器、頻譜分析儀、邏輯分析儀等儀器表現(xiàn)出一定壓力。虛擬儀器脫胎于數(shù)字存儲(chǔ)示波器，于 1986 年正式推出編程環(huán)境 LabVIEW，標(biāo)志虛擬儀器基本成型 [2]。 1983 年， Apple 公司推出了世界上第一款圖形界面的微型計(jì)算機(jī)Macintosh,標(biāo)志著在計(jì)算機(jī)屏幕上模擬儀器成為可能 [5]。隨著微軟基于圖形界面 Windows 的出現(xiàn)，LabVIEW 開(kāi)始向 Windows 平臺(tái)移植，隨著虛擬儀器技術(shù)越來(lái)越廣的被開(kāi)發(fā)運(yùn)用，眾