2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、附錄附錄A外文翻譯原文外文翻譯原文DesignoftheTemperatureControlSystemBasedonAT89S51Abstract::TheprinciplefunctionsofthetemperaturecontrolsystembasedonmicrocontrollerAT89S51arestudiedthetemperaturemeasurementunitconsistsofthe1Wirebusdigit

2、altemperaturesensDS18B20.Thesystemcanbeexpectedtodetectthepresettemperaturedisplaytimesavemonitingdata.Analarmwillbegivenbysystemifthetemperatureexceedstheupperlowerlimitvalueofthetemperaturewhichcanbesetdiscretionarilyt

3、henautomaticcontrolisachievedthusthetemperatureisachievedmonitingintelligentlywithinacertainrange.Basingonprincipleofthesystemitiseasytomakeavarietyofothernonlinearcontrolsystemssolongasthesoftwaredesignisreasonablychang

4、ed.Thesystemhasbeenprovedtobeaccuratereliablesatisfiedthroughfieldpractice.KeyWds:AT89S51MicrocontrollerDS18B20TemperatureI.IntroductionTemperatureisaveryimptantparameterinhumanlife.Inthemodernsocietytemperaturecontrol(T

5、C)isnotonlyusedinindustrialproductionbutalsowidelyusedinotherfields.WiththeimprovementofthelifequalitywecanfindtheTCapplianceinhotelsfactieshomeaswell.thetrendthatTCwillbetterservethewholesocietysoitisofgreatsignificance

6、tomeasurecontrolthetemperature.BasedontheAT89S51temperaturesensDS18B20thissystemcontrolstheconditiontemperatureintelligently.Thetemperaturecanbesetdiscretionarilywithinacertainrange.ThesystemcanshowthetimeonLCDsavemoniti

7、ngdataautomaticallycontrolthetemperaturewhentheconditiontemperatureexceedstheupperlowerlimitvalue.Bydoingsoitistokeepthetemperatureunchanged.Thesystemisofhighantijamminghighcontrolprecisionflexibledesignitalsofitstherugg

8、edenvironment.Itismainlyusedinpeopleslifetoimprovethequalityofthewklife.Itisalsoversatilesothatitcanbeconvenienttoextendtheuseofthesystem.Sothedesignisofprofoundimptance.Thegeneraldesignhardwaredesignsoftwaredesignofthes

9、ystemarecovered.Ⅱ.SYSTEMGENERALDESIGNThehardwareblockdiagramoftheTCisshowninFig.1.ThesystemhardwareincludesthemicrocontrollertemperaturedetectioncircuitkeyboardcontrolcircuitclockcircuitDisplayalarmdrivecircuitexternalRA

10、M.BasedontheAT89S51theDS18B20willtransferthetemperaturesignaldetectedtodigitalsignal.thesignalissenttothemicrocontrollerfprocessing.AtlastthetemperaturevalueisshowedontheLCD12232F.Thesestepsareusedtoachievethetemperature

11、detection.UsingthekeyboardinterfacechipHD7279tosetthetemperatureTheLCD12232Fisusedwhichcanbeusedtoshowacterstemperaturevaluetimesupplyafriendlydisplayinterface.The12232FisaLCDwith819212832pixelsChineseacterdatabase128168

12、pixelsIIactersetgraphics.Itmainlyconsistsofrowdrivecolumndrive12832fulllatticeLCDwiththefunctionofdisplayinggraphicsaswellas7.52Chineseacters.ItisinaparallelserialmodetoconnecttoexternalCPU[7].Indertoeconomizethehardware

13、resourcethe12232FshouldbeconnectedtotheAT89S51inserialmodewithonly4outputptsused.TheLCDgrayscalecanbechangedbyadjustingthevariableresistconnectedthepinVlcdoftheLCD.CLKisusedtotransmitserialcommunicationclock.SIDisusedtot

14、ransmitserialdata.CSisusedtoenablecontroltheLCD.LisusedtocontroltheLCDbacklightpower.D.ClockCircuitTheDallasDS1302isusedwhichisahighperfmancelowpowerrealtimeclockchipwithRAM.TheDS1302servesinthesystemwithcalendarclockisu

15、sedtomonitthetime.ThetimedataisreadprocessedbytheAT89S51thendisplayedbytheLCD.Alsothetimecanbeadjustedbythekeyboard.TheDS1302crystaloscillatissetat32768Hztherecommendedcompensationcapacitanceis6pF.Theoscillatfrequencyisl

16、owersoitmightbepossiblenottoconnectthecapacitthiswouldnotmakeabigdifferencetothetimeprecision.Thebackuppowersupplycanbeconnectedtoa3.6Vregeablebattery.E.KeyboardControlCircuitThekeyboardinterfaceinthesystemisdrivenbytheH

17、D7279Awhichhasa5Vsinglepowersupplywhichisconnectedtothekeyboarddisplaywithoutusinganyactivedevice.Accdingtothebasicrequirementsfunctionsofthesystemonly6buttonsareneeded.ThesystemsfunctionsaresetbytheAT89S51receivingtheen

18、tereddata.Indertosavetheexternalresistthe16keyboardisusedthekeyboardcodesaredefinedas:07H0FH17H1FH27H2FH.Thedercanbereadoutbyreadingthecodeinstruction.HD7279AisconnectedtotheAT89S51inserialmodeonly4ptsareneed.AsshowninFi

19、g.6DIG0~DIG5DParerespectivelythecolumnlinesrowlineptsofthesixkeyswhichachievekeyboardmonitingdecodingkeycodesidentification.F.AlarmCircuitIndertosimplifythecircuitconvenientdebugginga5Vautomaticbuzzerisusedinthealarmcirc

20、uit[8].thismakethesoftwareprogrammingsimplified.AsshowninFig.7itiscontrolledbythePNPtransist9012whosebaseisconnectedtothepinP2.5oftheAT89S51.WhenthetemperatureexceedstheupperlowerlimitvaluetheP2.5outputlowlevelwhichmakes

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