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双向防盗器设计 【摘要】随着人们生活水平的提高,汽车已逐步进入家庭,对汽车防盗的要求越来越高,并且无线技术的不断发展,使得防盗系统的设计更加灵活、安全、方便、可靠。本文主要介绍基于LPC930单片机和TDA5255无线收发模块设计的双向汽车防盗系统,分遥控器和主机设计两部分。遥控器和主机进行半双工的通信,遥控器控制主机的状态,包括设防、解除、寻车、开尾门等,还具有与主机同步报警的功能;主机能够检测多个触发源自动报警并且同步通知遥控器,能根据遥控器的设定执行相应的功能,还具有自动上下锁、中控锁自动化、自动恢复、紧急解除等功能。自定义无线通信协议,协议数据采用PWM编码,使用FSK调制和解调方式。软件实现采用C语言编程和Keil编译环境。 【关键词】 LPC930、TDA5255、PWM、FSK调制和解调 【Abstract】Withtheimprovementofpeople’slivingstandard,privatecarshavegraduallysteppedintomoreandmorecommonfamilies,andasaresult,peoplehavebeenmoreandmoreconcernedwitheffectivevehicleguarding-against-theftsystems;andatthesametime,withthecontinuousdevelopmentofwirelesstechnology,thiskindofsystemshavebecomemuchmoreflexible,convenient,reliableandsafer.Thisarticleintroducesadesignofabi-directionalvehicleguarding-against-theftsystem,whichisbaseduponMCULPC930andradiotransmissionandreceptionmoduleTDA5255,andthedesignismadeupoftwomainparts:theremotecontrollerandthemainframe.Thecommunicationbetweentheremotecontrollerandthemainframeisbymeansofhalf-duplexdatatransmission,andthestatesofthemainframecontrolledbythecontrollerincludesettingupandreleasefromdefense,seekingcars,openingthebackdoorofcarsanditalsocangiveanalarmsimultaneouswiththemainframe;andthemainframecandetectcouplesoftriggeredsources,giveanalarmandinformthecontrollersimultaneously,andalso,itcancarryoutcorrespondingactionssetbythecontroller;besides,itcanautomaticallylockandunlock,reverttotheoriginalstate,central-controllinglockandreleasefromdefensewheninemergency.Thesystemhasa PWM-codingbasedself-definingcommunicationprotocol,anditusesFSKmodulationanddemodulation.TheprogrammingisbasedonprogramminglanguageCwithKeilasthecompilerenvironment. 【Keywords】LPC930、TDA5255、PWM、FSKModulateandDemodulate 目录 TOC\o"2-9"\h\z\t"标题1,1"HYPERLINK\l"_Toc104527269"第1章引言 PAGEREF_Toc104527269\h6 HYPERLINK\l"_Toc104527270"第2章防盗器系统要求 PAGEREF_Toc104527270\h8 HYPERLINK\l"_Toc104527271"2.1 防盗器主机指标要求 PAGEREF_Toc104527271\h8 HYPERLINK\l"_Toc104527272"