基于单片机的温度控制外文文献及中文翻译

Temperature Control Using a Microcontroller:An Interdisciplinary Undergraduate Engineering Design Pr

TemperatureControlUsingaMicrocontroller: AnInterdisciplinaryUndergraduateEngineeringDesignProject JamesS.McDonald DepartmentofEngineeringScience TrinityUniversity SanAntonio,TX78212 Abstract ： Thispaperdescribesaninterdisciplinarydesignprojectwhichwasdoneunderthe author’ssupervisionbyagroupoffourseniorstudentsintheDepartmentofEngineeringScience atTrinityUniversity.Theobjectiveoftheprojectwastodevelopatemperaturecontrolsystem foranair-filledchamber.Thesystemwastoallowentryofadesiredchambertemperatureina prescribedrangeandtoexhibitovershootandsteady-statetemperatureerroroflessthan1degree Kelvinintheactualchambertemperaturestepresponse.Thedetailsofthedesigndevelopedby thisgroupofstudents,basedonaMotorolaMC68HC05familymicrocontroller,aredescribed. Thepedagogicalvalueoftheproblemisalsodiscussedthroughadescriptionofsomeofthekey stepsinthedesignprocess.Itisshownthatthesolutionrequiresbroadknowledgedrawnfrom severalengineeringdisciplinesincludingelectrical,mechanical,andcontrolsystemsengineering. 1Introduction Thedesignprojectwhichisthesubjectofthispaperoriginatedfromareal-world application.AprototypeofamicroscopeslidedryerhadbeendevelopedaroundanOmegaTM modelCN-390temperaturecontroller,andtheobjectivewastodevelopacustomtemperature controlsystemtoreplacetheOmegasystem.Themotivationwasthatacustomcontroller targetedspecificallyfortheapplicationshouldbeabletoachievethesamefunctionalityata muchlowercost,astheOmegasystemisunnecessarilyversatileandequippedtohandleawide varietyofapplications. ThemechanicallayoutoftheslidedryerprototypeisshowninFigure1.Themainelement ofthedryerisalarge,insulated,air-filledchamberinwhichmicroscopeslides,eachwitha tissuesampleencasedinparaffin,canbesetoncaddies.Inorderthattheparaffinmaintainthe properconsistency,thetemperatureintheslidechambermustbemaintainedatadesired (constant)temperature.Asecondchamber(theelectronicsenclosure)housesaresistiveheater andthetemperaturecontroller,andafanmountedontheendofthedryerblowsairacrossthe heater,carryingheatintotheslidechamber.Thisdesignprojectwascarriedoutduringacademic year1996–97byfourstudentsundertheauthor’ssupervisionasaSeniorDesignprojectinthe DepartmentofEngineeringScienceatTrinityUniversity.Thepurposeofthispaperis 1