1、displaytimesavemonitoringdata.Analarmwillgivenbyifexceedsupperlowerlimitvaluewhichsetdiscretionarilythenautomaticisachieved,thusachievedintelligentlywithinacertainrange.Basingsystem,iteasymakevarietyothernon-linearsystemssolongassoftwaredesignreasonablychanged.hasbeenprovedaccurate,reliablesatisfied
2、throughfieldpractice.KEYWORDS:AT89C51;controller;DS18B20;1INTRODUCTIONveryimportantparameterinhumanlife.Inmodernsociety,(TC)notonlyusedindustrialproduction,butalsowidelyfields.Withimprovementlifequality,wefindTCappliancehotels,factorieshomewell.Andtrendthatbetterservewholegreatsignificancemeasuretem
3、perature.DS18B20,thiscontrolsconditionintelligently.showLCD,data;automaticallywhenvalue.Bydoingkeepunchanged.highanti-jamming,precisionflexibledesign;fitsruggedenvironment.Itmainlypeoplesimprovequalityworkversatile,convenientextendusesystem.Soprofoundimportance.generaldesign,hardwarecovered.Introduc
4、tion The8-bitCHMOSmicrocontrollersdesignedhandlehigh-speedcalculationsfastinput/outputoperations.MCS51typicallyforeventsystems.Commercialapplicationsincludemodems,motor-controlsystems,printers,photocopiers,airconditionerdiskdrives,medicalinstruments.automotiveindustryengine-controlairbags,suspension
5、antilockbraking(ABS).especiallywellsuitedbenefitfromitsprocessingspeedenhancedon-chipperipheralset,suchpower-traincontrol,vehicledynamicsuspension,braking,stabilityapplications.Becausethesecriticalapplications,marketrequirescost-effectivewithlowinterruptlatencyresponse,abilityservicenumberdriveninte
6、gratedperipheralsneededrealCPUaboveaveragepowersinglepackage.financiallegalriskhavingdevicesoperateunpredictablyhigh.Oncemarket,particularlymissionanautopilotoranti-lockmistakesfinanciallyprohibitive.Redesigncostsrun$500K,muchmorefixmeans2backannotatingacrossproductfamilysharesamecoreand/orflaw.addi
7、tion,replacementscomponentsextremelyexpensive,sealedmodulestotalseveraltimescomponent.Tomitigateproblems,essentialcomprehensivetestingcontrollerscarriedoutatbothcomponentlevelunderworstcaseenvironmentalvoltageconditions.Thiscompletethoroughvalidationnecessitateswell-definedprocessproperenvironmentto
8、olsfacilitateexecutesuccessfully.IntelChandlerPlatformEngineeringgroupprovidespostsilicon(SV)variousmicro-controllersprocessors.brokenintothreemajorparts.typedeviceapplicationrequirementsdeterminetypesperformeddevice.followingstandardfeatures4KbytesFlash,128bytesRAM,32I/Olines,two16-bittimer/counters,fivevectortwo-levelarchitecture,fulldupleser-ialport,oscillatorclockcircuitry.staticlogicoperationdownzerofrequencysuppor
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