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****大学本科生毕业设计(论文)学院(系):******专业:******学生:**指导教师:***完成日期2012年5月****本科生毕业设计(论文)基于STM32的便携式心电图仪设计DesignofPortableECGDeviceBasedonSTM32总计:毕业设计(论文)25页表格:1个插图:19幅***本科毕业设计(论文)基于STM32的便携式心电图仪设计DesignofPortableECGDeviceBasedonSTM32学院(系):******专业:******学生姓名:**学号:069108209指导教师(职称):***评阅教师:完成日期:********基于STM32的便携式心电图仪设计I基于STM32的便携式心电图仪设计********[摘要]本系统完成了基于STM32微处理器的心电采集及分析处理系统的方案设计、硬件和软件设计与实现,心电信号采集电路是其关键部分,主要完成信号的正确提取。本系统属于典型的生物医学信号采集处理系统,处理的对象是强噪声背景下的微弱心电信号,噪声和干扰的存在对前端采集电路提出了更高的要求。根据心电信号的特点,选用精密仪表放大器为主要元件设计了前置放大电路。为更好的降低干扰的影响,设计了右腿驱动电路、高通、低通滤波电路以及陷波电路,成功提取了心电信息。心电处理电路通过A/D转换把模拟信号转换成数字信号送至微处理器做进一步处理,该部分电路主要包括STM32处理器电路、LCD接口电路等,选用ST公司的低成本、低功耗的Cortex-M3核处理器STM32F103ZE作为控制核心。[关键词]心电采集;滤波电路;共模干扰;STM32DesignofPortableECGDeviceBasedonSTM32ElectricalEngineeringandAutomationSpecialtyWANGJieAbstract:ThesystemproposedaplanofECGacquisition,analysisandprocessingsystemwhichbasedonSTM32,andcompleteditshardwareandsoftwaredesign.ThecoreofthesystemisECGacquisitioncircuit,whichistocompletethesignalextraction.Thesystemisatypicalbiomedicalsignalcollecting-processingone,whichprocessesweaksignalsinstrongnoisebackground.Becauseoftheimpactofnoiseandinterference,thefront-endacquisitioncircuitneedstohavehigherperformance.AccordingtothecharacteristicsofECG,theprecisioninstrumentationamplifiersarechosentodesignthepreamplifiercircuit.Inordertoreducetheinterferenceeffects,rightlegdrivecircuits,high-passfilterandlow-passfilterisdesignedtoextracttheECGsignal.ThroughtheA/DconverterofECGprocessingcircuit,analogsignalsareconvertedintodigitalsignals,whicharesenttothemicroprocessorforfurtherprocessing.ECGprocessingcircuit,coreofwhichisamicrocontrolleroflowcostandlowpowerCortex-M3byST,mainlyincludepowermanagementcircuits,STM32processorcircuits,LCDinterfacecircuitsandsoon.Keywords:Ecgacquisition;filtercircuit;serialcommunication;STM32基于STM32的便携式心电图仪设计II目录1引言.....................................................................................................................................11.1心电图仪在医学领域中的应用.....................................................................................11.2便携式心电图仪的发展状况.........................................................................................22系统总体设计.....................................................................................................................32.1主要功能.........................................................................................................................32.2系统设计方案.................................................................................................................43便携式心电图仪的硬件设计......................................................................................43.1最小核心系统的设计.....................................................................................................53.1.1处理器的选择...........................................................................................................53.1.2最小核心系统电路的设计.......................................................................................63.2人机交互界面的设计.....................................................................................................93.2.1显示界面设计...........................................................................................................93.2.2按键设计.................................................................................................................103.3前置放大电路以及右腿驱动电路...............................................................................113.4滤波电路以及陷波电路的设计...................................................................................123.5电源电路的设计...........................................................................................................134便携式心电图仪的软件设计...........................................................................................144.1软件开发平台...............................................................................................................144.2软件系统整体设计.......................................................................................................164.2.1软件总体分析.........................................................................................................164.2.2STM32软件系统设计流程...................................................................................164.2.3软件总体流程图.....................................................................................................174.3信号采集程序设计.......................................................................................................184.4数字滤波程序设计.......................................................................................................184.5液晶程序设计...............................................................................................................195系统调试结果及误差分析.................................................................................................205.1调试手段.......................................................................................................................205.2测量调试以及分析...........................................
本文标题:基于stm32的便携式心电图仪毕业设计
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