智能儀表的設(shè)計附can總線接口技術(shù)研究

1、陜西理工學(xué)院畢業(yè)設(shè)計智能儀表的設(shè)計及CAN總線接口技術(shù)研究[摘要摘要]對CAN總線接口技術(shù)進行了研究，設(shè)計出以AT89S52為控制核心具有溫度和濕度測量功能的智能儀表。詳細分析了SJA1000內(nèi)置CAN控制器的工作原理設(shè)計了CAN總線接口電路。在溫濕度測量中采用SHT11作為溫濕度傳感器實現(xiàn)了0℃～120℃范圍內(nèi)的高精度溫度測量。實驗表明所開發(fā)的溫濕度智能儀表性能穩(wěn)定工作可靠具有高精度、示值穩(wěn)定性好等特點。[關(guān)鍵詞關(guān)鍵詞]智能儀表，溫濕

2、度測量，CAN總線，SJA1000，PCA82C250IntelligentInstrumentofDesignCanBusInterfaceTechnologyofResearchAbstract:CANBusinterfacetechnologyonastudydesignedtoAT89S52asthecontrolcenterwiththetemperaturehuitymeasuringcapabilitiesofsmartm

3、eters.DetailedanalysisofthebuiltinCANcontrollerSJA1000wkingprincipledesignaCANbusinterfacecircuit.IntemperaturehuitymeasurementastemperaturehuitysenssusingSHT11achieved0℃~120℃rangeprecisiontemperaturemeasurement.Experime

4、ntalresultsshowthatthedevelopedintelligentinstrumenttemperaturehuitystableperfmancereliablehighaccuracyexcellentstabilityIndicationKeywds:IntelligentInstrument；Temperaturehuitymeasurement；CANBus；SJA1000；PCA82C250陜西理工學(xué)院畢業(yè)

5、設(shè)計第i頁共34頁4.2.2傳感器選擇....................................115基于CAN溫濕度儀表分布式測量系統(tǒng)的硬件設(shè)計.............125.1單片機AT89S52簡介..................................125.2單片機應(yīng)用知識.....................................135.2.1單片機中斷知識.............

6、....................135.2.2單片機的定時計數(shù)器............................135.3CAN總線節(jié)點硬件電路及設(shè)計...........................145.3.1CAN總線控制器SJA1000介紹.....................145.3.2CAN總線收發(fā)器PCA82C250介紹...................165.3.3CAN節(jié)點硬件電路....

7、...........................185.4溫濕度傳感器電路設(shè)計................................195.4.1SHT11的結(jié)構(gòu)...................................195.4.2內(nèi)部命令與接口時序............................205.4.3溫度和濕度值的計算............................225.4.4溫

8、濕度測量電路設(shè)計............................235.5顯示模塊............................................245.5.1液晶顯示模塊結(jié)構(gòu)特點...........................245.5.2讀、寫操作時序................................265.5.3單片機與液晶模塊電路設(shè)計......................