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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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