基于單片機(jī)的溫度控制系統(tǒng)設(shè)計畢業(yè)論文

1、I摘要溫度是表征物體冷熱程度的物理量，是工農(nóng)業(yè)生產(chǎn)過程中一個很重要而普遍的參數(shù)。由于溫度測量的普遍性，溫度傳感器的數(shù)量在各種傳感器中居首位。溫度控制的發(fā)展引入單片機(jī)后，可以降低對某些硬件電路的要求。基于單片機(jī)的溫度控制系統(tǒng)，可以實現(xiàn)對溫度的精確控制。本文以溫室為研究對象，以AT89C51單片機(jī)為核心所實現(xiàn)的溫度控制系統(tǒng)具有自動完成數(shù)據(jù)采集、數(shù)據(jù)處理、數(shù)據(jù)轉(zhuǎn)換控制、鍵盤終端處理及顯示的功能。當(dāng)實際溫度低于設(shè)定值，PTC進(jìn)行加熱，反之PTC

2、就停止加熱。實際溫度超上限或者低下限時，系統(tǒng)自動報警。溫度控制采用的是雙位控制，簡單易行，在精度要求不是特別高的溫室，可行度很高。最后對系統(tǒng)進(jìn)行調(diào)試并在PROTEUS里仿真，結(jié)果表明該系統(tǒng)原理可行。又在一個小空間進(jìn)行試驗，誤差在1℃左右，結(jié)果符合預(yù)期。運行穩(wěn)定、控制效果好、性價比高。關(guān)鍵詞：單片機(jī)，溫度控制，DS18B20，溫室AbstractTemperatureisthephysicalquantityacterizingthete

3、mperatureextentofobjectsitisanimptantgeneralparameterinindustrialagriculturalproductionprocess.Duetotheuniversalityoftemperaturemeasurementthequantityoftemperaturesensoccupiesfirstplaceamongvarioussenss.Itcanlowertherequ

4、irementsofsomecircuitsafterintroducingthedevelopmentoftemperaturecontrolintomicrocontrollerunit.Itcanalsoachieveprecisecontrolofthetemperaturebasedonthetemperaturecontrolsystemofmicrocontrollerunit.Inthisarticlegreenhous

5、eistheobjectofstudy.ThetemperaturecontrolsystemwhichtakesAT89C51asthecehasthefunctionofautomaticcompletedataacquisitiondataprocessingdataconversioncontrolkeyboardterminalprocessingdisplay.Whentheactualtemperatureisbelowt

6、hesetvaluePTCstartsheatingonthecontraryitstopsheating.Whentheactualtemperatureexceedstheupperlowerlimitthesystemgivesanalarmautomatically.Temperaturecontrolissimpleeasywithadualpositioncontrol.Itishighlyfeasibleinthegree

7、nhousewheretheaccuracyrequirementsarelessstrict.TheresultsshowstheprincipleisavailableafterdebuggingthesystemsimulatinginProteuswealsoconductedthesametrialinasmallerroomtheerrisabout1℃whichisinlinewithexpectations.Thesys

8、temisstableeasytocontrolcosteffective.Keywd:microcontrollerunittemperaturecontrolDS18B20greenhouse中國農(nóng)業(yè)大學(xué)學(xué)士論文目錄III第四章第四章控制系統(tǒng)軟件設(shè)計控制系統(tǒng)軟件設(shè)計................................................174.1主程序模塊設(shè)計.........................

9、........................174.1.1主程序流程圖..............................................174.2溫度采集模塊程序設(shè)計............................................184.2.1DS18B20的時序............................................184.2.3讀溫度子程序流程圖.

10、.......................................204.3溫度設(shè)定模塊程序設(shè)計............................................214.3.1中斷服務(wù)子程序............................................214.3.2鍵盤掃描子程序............................................214.4溫

11、度顯示模塊設(shè)計................................................234.4.1設(shè)定值顯示子程序..........................................234.4.2實際值顯示子程序..........................................244.5溫度控制模塊設(shè)計......................................

12、..........254.5.1雙位控制算法設(shè)計..........................................254.5.2溫度控制子程序流程圖......................................254.6報警模塊程序設(shè)計................................................26第五章第五章結(jié)果分析結(jié)果分析.....................

13、...................................275.1PROTEUS仿真....................................................275.1.1鍵盤設(shè)定溫度仿真..........................................275.1.2溫度采集仿真..............................................285

14、.1.3整體仿真..................................................285.2實際運行結(jié)果....................................................29第六章第六章總結(jié)與展望總結(jié)與展望......................................................316.1總結(jié)....................

15、........................................316.2展望............................................................31致謝..................................................................32附錄程序附錄程序.................................