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1、.基于CAN總線的多點(diǎn)溫度監(jiān)測及報(bào)警系統(tǒng)設(shè)計(jì)摘要本文設(shè)計(jì)的是一套基于CAN總線的多點(diǎn)溫度檢測及報(bào)警系統(tǒng)，主要是對糧倉的溫度監(jiān)控，以確保儲(chǔ)糧的安全。系統(tǒng)設(shè)計(jì)分為主控模塊和監(jiān)控模塊。主控監(jiān)控兩模塊的微處理器都采用AT89S52單片機(jī)。為了實(shí)現(xiàn)主控模塊對監(jiān)控模塊的實(shí)時(shí)監(jiān)測，在主控端和監(jiān)控端處都設(shè)計(jì)有CAN通信電路，由控制器SJA1000和收發(fā)器82C250組成CAN通信接口。另外，主控端的外圍電路部分包括時(shí)鐘電路功能模塊、EEPROM存儲(chǔ)電路模塊、串口通信電路模塊、譯碼電路功能模塊、液晶顯示屏模塊；監(jiān)控端的外圍電路部分為溫度傳感器。主控端的時(shí)鐘芯
2、片選用DS12887，EEPROM存儲(chǔ)芯片選用戶AT24C16，顯示屏采用FM12232B液晶模塊。監(jiān)控端的溫度傳感器采用數(shù)字傳感器DS18B20，系統(tǒng)設(shè)置溫度傳感器的闡值為50℃。本文給出了系統(tǒng)的結(jié)構(gòu)和軟硬件設(shè)計(jì)方案，可實(shí)現(xiàn)實(shí)時(shí)溫度測量、越限報(bào)警等功能。該系統(tǒng)具有可靠性好、通信速率高、抗干擾能力強(qiáng)等特點(diǎn)。本系統(tǒng)還適用于在糧倉、北方暖氣和熱水供應(yīng)中心、大面積水泥鋪建等多種場合。關(guān)鍵詞：CAN總線；DS18B20；AT89S52...BASEDONCANBUSMULTIPOINTTEMPERATUREMONITORINGANDALARMIN
3、GSYSTEMDESIGNABSTRACTThispaperdesignsamulti-pointtemperaturedetectionandalarmsystembasedonCANbus,thissystemismainlyusedtomonitorthetemperatureofgranary,toensurethesafetyofthestoredgrain.Thissystemisdividedintothemaincontrolmoduleandthesurveillancemodule.Themicroprocessorof
4、themaincontrolmoduleandthesurveillancemodulebothuseDSPAT89S52microcontroller.Inordertoachievereal-timemonitoringandmeasuringofthesurveillancemodule,CANcommunicationscircuitsaredesignedattheportofthemaincontrolmoduleandthesurveillancemodule,whichiscomposedbythecontrollerSJA
5、1000andthe82C250communicationsinterface.Inaddition,theexternalcircuitsectionofthemaincontrolmoduleincludestheclockcircuitmodules,EEPROMmemorycircuitmodule,serialcommunicationcircuitmodule,decodingcircuitmodules,LCDmodules;themainportionoftheexternalcircuitsectionofthesurve
6、illancemoduleisthetemperaturesensor.TheclockchipofthemaincontrolmoduleusesDS12887,theEEPROMmemorychipcanselectAT24C16,theLCDdisplaymodulecanselectFM12232B.ThetemperaturesensorofthesurveillancemoduleusethedigitalsensorDS18B20,thelininalvalueofthetemperaturesensorissettedat5
7、0℃bythesystem.Thispaperpresentsthearchitectureofthesystemandthehardwareandsoftwaredesignproposal,enablingthefunctionofreal-timetemperaturemeasurementandtheoff-limitedalarm.Thesystemhasgoodreliability,hightransmissionrate,stronganti-interferenceandsoon.Thissystemcanalsobeap
8、pliedtothegranary,thenorthcentralheatingandhotwatersupplycenter,thecementpavingofalargear
