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1、基于DS18B20的數(shù)字溫度計(jì)設(shè)計(jì)摘要隨著現(xiàn)代信息技術(shù)的飛速發(fā)展和傳統(tǒng)工業(yè)改造的逐步實(shí)現(xiàn)，能夠獨(dú)立工作的溫度檢測與顯示系統(tǒng)應(yīng)用于諸多領(lǐng)域。傳統(tǒng)的溫度檢測以熱敏電阻為溫度敏感元件。熱敏電阻的成本低，需要外加信號處理電路，而且可靠性相對較差，測溫準(zhǔn)確度低，檢測系統(tǒng)也有一定的誤差。與傳統(tǒng)的溫度計(jì)相比，這次設(shè)計(jì)的是基于DS18B20的數(shù)字溫度計(jì)，它具有讀數(shù)方便，測溫范圍廣，測溫精確，數(shù)字顯示，適用范圍寬等特點(diǎn)。在本設(shè)計(jì)中選用AT89C51型單片機(jī)作為主控制器件，采用DS18B20數(shù)字溫度傳感器作為測溫元件，通過4位共陽極LED數(shù)碼顯示管并行傳送數(shù)據(jù)，實(shí)現(xiàn)溫度顯示。本設(shè)計(jì)的內(nèi)容主要分為兩部分，一
2、是對系統(tǒng)硬件部分的設(shè)計(jì)，包括溫度采集電路和顯示電路；二是對系統(tǒng)軟件部分的設(shè)計(jì)，應(yīng)用C語言實(shí)現(xiàn)溫度的采集與顯示。通過DS18B20直接讀取被測溫度值，送入單片機(jī)進(jìn)行數(shù)據(jù)處理，之后進(jìn)行輸出顯示，最終完成了數(shù)字溫度計(jì)的總體設(shè)計(jì)。其系統(tǒng)構(gòu)成簡單，信號采集效果好，數(shù)據(jù)處理速度快，便于實(shí)際檢測使用。關(guān)鍵詞：單片機(jī)AT89C51；溫度傳感器DS18B20；LED數(shù)碼管；數(shù)字溫度計(jì)DesignbasedDigitalThermometerDS18B20AbstractAlongwiththepresentinformationtechnology'sswiftdevelopmentandtraditi
3、onalindustrytransformation'sgradualrealization.Abletoworkindependentlyofthetemperaturedetectionanddisplaysystemusedinmanyotherfields.Traditionaltemperatureexaminationtakethermistorastemperaturesensitiveunit.Thermistor'scostislow,needsthesur-signalprocessingelectriccircuit,moreoverthereliabilityi
4、srelativelybad,thetemperaturemeasurementaccuracyislow,theexaminationsystemalsohascertainerror.Compareswiththetraditionalthermometer,whatthisdesignisbasedontheDS18B20digitalthermometer,ithasthereadingtobeconvenient,thetemperaturemeasurementscopeisbroad,thetemperaturemeasurementisprecise,thedigitd
5、emonstratedthatapplicablescopewideandsooncharacteristics.UsedinthedesignAT89C51MCUasthemaincontroldevice,digitaltemperaturesensorDS18B20asthetemperaturecomponentsoftheanodethroughthefourLEDdigitaldisplaytubeparalleltransmissionofdata,toachievetemperaturedisplay.Thisdesign'scontentmainlydividesin
6、totwoparts;first,tosystemhardwarepartdesign,includingtemperaturegatheringelectriccircuitanddisplaycircuit;Second,tothesystemsoftwarepart'sdesign,realizestemperaturegatheringandthedemonstrationusingtheClanguage.DS18B20measuredbydirectreadingtemperaturevalues,andtransferDataintoMCU,andoutputtoshow
7、,thisisthedesignoftheDigitalThermometer.Itssystemconstitutionissimple,theeffectofsignalgatheringisgood,thespeedofdataprocessingisquick,atalitisadvantageousfortheactualexaminationuse.Keywords:MCUAT89S51;TemperatureSensorDS18B
