单片机外文翻译AT89C51单片机控制的恒温水域温控系统.docx

单片机外文翻译AT89C51单片机控制的恒温水域温控系统.docx

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单片机外文翻译AT89C51单片机控制的恒温水域温控系统

AT89C51single-chiptemperature-controlledwatertemperaturecontrolsystem

Earlycontactthermometersforchemicalwatertemperaturethermostatshortcomings,thispaperintroducesanapproachbasedonAT89C51single-chipmicrocomputer-basedcontroller,combinedwithintegratedtemperaturesensorAD590Jcomposedofconstanttemperaturewatertemperaturecontrolsystem.

Chemical,chemicalexperimentsandresearchonwatertemperaturerequirementsofhighperformanceandaccuracy,thecurrentmarketfacechemistry,chemicalexperimentsandstudythehighpriceofheatedwatersystems.Inthispaper,thedesignofsingle-chipcomponentAT89C51fromthetemperaturecontrolsystemforpeoplewithlow-cost,highprecision,intelligentcontrol,etc.

Thewatertemperatureoftheperformanceindicatorsare:

Temperaturerange:

0~1O0℃;temperaturerange:

0~99.9℃;temperature:

0.4℃;heatingpower:

1000W.

Partofthehardwarecircuit

AT89C51selectedasthesystemCPU,itisalow-power,highperformance,4kBflashchipprogrammable/erasableread-onlymemory8-bitmicrocontrollerCOMS.

BlockdiagramofthesystemAT89C51single-chipbychip,IOexpansionport8255chip,8032chipdigital-to-analogconversion,analog-to-digitalconversionchip0809,keyboardcontrol,statusindicationcircuit,samplingcircuittemperaturethermostatcontrolcircuit,drivercircuitanddisplaycircuit,suchasgroupinto.

1.1temperaturesamplingcircuit

TemperaturesamplingcircuitusingAD590current-modetemperature-sensitivedeviceofitsstabilityandlinearityarebetter.WheninAD590forthecurrent273.2uA,temperatureincrease1℃,thecurrentincreasein1uA.Thecurrentisconvertedtovoltagesignalbyanalog-to-digitalconverterADC0809,AT89C51single-chiptemperaturemonitoringandconversion.OneresistorRmeasurementusingalowtemperaturecoefficientofresistance,temperaturecoefficientof10xl0_6/℃.WhenmonitoringthetemperatureoflO0℃whengeneratedintheresistorvoltage18.66Vabout,whenthetemperatureis0℃whengeneratedintheresistanceofabout13.66Vvoltage,thatis,atatemperatureof0~1O0℃inresistanceonpressuredropresultingfrombadto5v.However,whenthetemperatureis0℃demodulationIC2potentialoutputallowsforOV,thetimewhen1O0℃forIC2output5v,intheconstanttemperaturewatertank3installedAD590,whicharelocatedunderthesinkinthevariousparts,usingitsmonitoringoftemperaturechangesinthemarkettankinordertocontrolthestirringmotortoensureuniformtemperaturesink.

1.2thermostatcontrolcircuit

Constanttemperaturecontrolcircuitfromheatingthermostattemperaturesettingandthecompositionofthetwopartsofthecircuit.Thethermostatcircuitsettingstemperaturetoprovidetheworkingconditionsoftheheatingcircuit,thecircuitsetbythekeyboardcombinationofsoftwareprogrammingtoachievecommon.InadditiontoeachbuttonandsettheIOportconnectedto8255,butalsothroughadoorwiththeAT89C51andT0timerconnectedsothatwhenthebuttonisdepressedimmediatelyaftertheinterruptiontotheapplicationAT89C51,8255inquiry,andatthesametimethefunctionsofthecorrespondingcontrol.OnesetisthekeytypefromthesetandtheAT89C51,D/AconverteranalogvoltagemeasurementistheAD590,afterthedetectionsignalAT89C51,D/Aconverterprovidesanalog,IC3constituteacomparisonamplifier,IC4ratioamplifier,BG1,BG2,Tconstitutesathyristorconductionanglecontrolcircuit,asinglebipolartransistoroscillatorcircuitthelowerthefrequency,SCR'son-theshorterthetimethesmallertheheatingpower,onthecontraryhigher.Single-junctiontransistorsandtheoscillationfrequencybytheratioofamplifieroutputvoltagecontrol,AT89C51single-chiptemperaturesettingsthroughthesampleandthetemperaturedifferenceafterthevalue,afteramplificationbycomparisonwiththetemperaturechangetomediatevoltagethyristortheconductionangleinordertoachievetheadjustmentofheatingpowertomeetthetemperaturerequirementsofthewatersofthethermostat.

1.3DriveCircuit

Whenthe8255highoutputcorrespondingIOport,thedrivetransistorturn-on9013,sothattherelayaction,inordertodrivetheworkoftherelevantcircuit.Significantchoiceforashowsothatthedisplaytochoosebetweenthe"settings"and"measurement".

1.4Keyboardcontrolandstatusindicationcircuit

Withthe8255connectedtotheIOport8and9LEDbuttontocompletethecommonwatersofthecontrolthermostatandtheinstructionsstate.Inadditiontoeachbuttonwiththe8255connectedtotheIOport,butalsowithAT89C51itconnectedthetimersothatwhenthebuttonisdepressedimmediatelyaftertheinterruptionofAT89C51applications,andquerythestatusof8255inordertocarryoutthefunctionsofthecorrespondingcont