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ThermoelectricTemperatureControllerComputerInterfaceStevenRosas
MultifunctionalElectronicMaterialsandDevicesResearchLabDepartmentofElectricandComputerEngineering,UniversityofTexasatSanAntonio,SanAntonio,TX78249,USA
ContactEmail:[email protected]
ABSTRACT• Thisresearchprojectaimstoengineerawaytointerfacebetweena
thermoelectrictemperaturecontrollerandapersonalcomputer.Thisdeviceconsideredhereisanexis;ngmanufacturedproduct,howeveritislimitedtoworkingindependentlyforhea;ngorcoolingthermoelectricmodules.Thenewinterfacesystemwilladddigitalinterfacetothetemperaturecontrollerandallowdatatobeextracted,decoded,andsendtoacomputer.
INTRODUCTION• Theobjec;veistointerfaceathermoelectrictemperaturecontrollerby
displayingthetemperatureshownonthefront7-segmentdisplaytothecomputermonitor.
• ThedevicetobeupgradedisanMTTC-1410ThermoelectricTemperatureControllermanufacturedbyMelcorofLairdTechnologies.Thisinstrumentusedtoaccuratelycontrolthetemperatureofaconnectedthermoelectricdevice.
• Thisdeviceisnotdesignedtoconnectwithacomputer.Thepurposeofthisprojectistofindawaytoexpandthecapabili;esofanexis;ngsystemusingengineeringknowledge.
REFERENCESCITED• i2c.info,“I2CInfo–I2CBus,InterfaceandProtocol,”i2c.info.2015[Online].
• Available:hTp://www.i2c.info.[Accessed:June2015].
• MelcorofLairdTechnologiesTechnicalStaff,ThermoelectricHandbook,
• MelcoraunitofLairdTechnologies,2009.
• Microcontrollers,”PIC16F877Adatasheet,2001-2003.
• MicroChip,“PIC16F/LF1825/182914/20-PinFlashMicrocontrollerswithnanoWaTXLPTechnology,”PIC16F1829datasheet,2010.
• MicroChip,“PIC16F87XA28/40/44-PinEnhancedFlashNa;onalInstrumentsCorpera;on,“MeasureTemperatureusingaRTD,myDAQ,andLabVIEW,”Na;onalInstrumentsCorpera;on.Jul23,2010[Online].
• Available:hTp://www.ni.com/example/31412/en/.[Accessed:June2015].
• OmegaEngineering,“OMEGA®ThinFilm
• DINClass“A”RTDElements,”F3141datasheet,2015
• Paul.Morton.EE3463.ClassLecture,Topic:“N-S12&PICPeripherals:I2C.”DepartmentofElectricalandComputerEngineering,TheUniversityofTexasatSanAntonio,SanAntonio,TX,May2015.
• Paul.Morton.EE3463.ClassLecture,Topic:“Q-S12&PICPeripherals:PWM.”DepartmentofElectricalandComputerEngineering,TheUniversityofTexasatSanAntonio,SanAntonio,TX,May2015.
• PhilipsSemiconductors,“SAA10644-digitLED-driverwithI2C-Bus
• interface,”SAA1064datasheet,February1991.
PROCESS• StartedwithMTTC-1410ThermoelectricTemperatureControllerfromMelcorofLairdTechnologies• Disassembledthecontroller’sfrontinterface.• Iden;fiedloca;onformodifica;onbetweenthePhillipsSAA1064TandtheMicrochipPIC16F877A.• Soldered3wiresforI2Coutput.TheGreenisSDAdataline,orangeisclockline,andblackisground.• Adigitaldataanalyzerwasconnectedtoeachofthe3wirestovisualizeoutputtofindaddressneededfortheprogram.• ProgrammedcodeforPIC16F1829totransla;ngI2CdatatoASCIIforcomputerinterface.• ConnectedwirestoassignedpinsonthePIC16F1829.
RESULTS
CONCLUSION
• TheMTTC1410ThermometricTemperatureControllerisnowconnectedtotheoutsideworld.
• Temperaturedatacannowbedisplayedandrecordedonacomputer.
• Oneimportantlessonthisprojectexperienceshowsarethefundamentalsofelectroniccommunica;onbetweendevices.
Acknowledgement:FinancialsupportofDepartmentofNavyjointprogramwiththeUniversityofTexasatAus;nandtheUniversityofTexasatSanAntoniounderGrantNo.N00014-14-0690(UTA14-000795),technicalguidanceofDr.PaulMortonandprogramsupportofDr.RuyanGuoandDr.AmarBhalla,areacknowledged.
WorkswithWindows.DownloadProli?icUSBtoSerialCommPortVersion3.3.2.105DriverandTeraTermapplication.
AlsowithMacOSX.DownloadProli?icUSBtoSerialCommPortMACDriverandSerialToolsapplication.
DISCUSSION
• Thetaskoffindinganoutput,thentransla;ngtheI2CtransmiongdatatoASCIItodisplayonacomputerwassuccessful.Apergoingoverthishurdle,thepossibili;esfortheMTTC1410ThermometricTemperatureControllerhavegreatlyexpanded.
• SopwareonacomputerlikeaLabViewplaqormcanusethisdataanddisplayingraphicinterfaces.