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1、摘要射频识别(简称RFID)技术是一种先进的自动识别技术,其通过射频信号自动对目标对象进行相关数据的获取并加以识别。射频识别系统主要由电子标签和读写器组成,它们之间无需接触就可完成识别和数据读取。射频识别技术相对于传统的磁卡及接触式IC卡技术具有非接触、阅读速度快、无磨损等特点,已被广泛应用于公共交通、门禁、物联网等众多领域。针对目前学生自制力差经常逃课,导致荒废学业的问题,本文提出了RFID考勤管理方案,对学生的考勤进行了系统的管理。本设计以AT89S52单片机为控制核心,以美国TEMIC公司生产的发射频率为125kHz的射频芯片U2270B为主的
2、射频模块、RS485串口通信模块、存储模块、时钟模块和声光提示电路共同构成了低频读卡器的设计,并应用于学生考勤管理。本文详细设计了低频读写器的硬件电路,并阐述了各个模块的器件选型及电路设计。其次,在低频读写器硬件电路的基础上介绍了软件设计的基本思想框架,以及对程序的编写和调试。关键词:低频读写器;射频识别;考勤管理;U2270BAbstractRadiofrequencyidentification(RFID)technologyisanadvancedautomaticidentificationtechnology,rfsignalthrough
3、theautomaticidentificationoftargetobjectaswellastherelateddataacquisition.Radiofrequencyidentificationsystemismainlycomposedofelectronictagandtoreadandwrite,theidentificationcanbecompletedwithoutcontactbetweenthemandthedataisread.Radiofrequencyidentificationtechnologycomparedwi
4、thtraditionalmagneticcardandcontactwithnon-contactICcardtechnologyandfastreading,nowear,hasbeenwidelyappliedtopublictransportation,accesscontrol,Internetofthings,andmanyotherfields.Aimingatpoorstudentsoftenskipclasses,whichleadstotheacademicwasteproblem,RFIDattendancemanagement
5、schemeisproposedinthispaper,onthestudents'attendancemanagementsystem.ThisdesignwiththeAT89S52singlechipmicrocomputerasthecore,totheUnitedStatesTEMICtransmittingfrequencyis125KHZrfchipU2270Bbasedradiofrequencymodule,RS485serialcommunicationmodule,storagemodule,clockmoduleandacou
6、sto-optichintcircuitconstitutethedesignoflowfrequencycardreader,andappliedtothestudentattendancemanagement.Thispaperdesignedthehardwarecircuitoflowfrequency,speaking,readingandwriting,andexpoundsthecomponentsselectionandcircuitdesignofeachmodule.Secondly,onthebasisofthehardware
7、circuitoflowfrequency,speaking,readingandwritingdeviceonframework,thebasicideaofsoftwaredesignareintroducedaswellasforthewritinganddebuggingoftheprogram.Keywords:Lowfrequencyread/writedevice;Radiofrequencyidentification;Theattendancemanagement;U2270B目录引言6第一章射频识别RFID技术71.1射频识别技术
8、概述71.1.1射频识别技术的特点及历史71.1.2射频识别技术的应用现状及发展方向81.2射频识别系统91