I摘要本文主要介绍一种以一组基于红外发射与接收模块的倒车雷达电路。该电路由两部分构成,其中一部分是发射红外调制光的发射电路,主要是发射出红外调制光,另外一部分是红外接收、译码及发声电路。该电路工作时,发射装置发射的红外光反射回来被接收装置接受,接受后通过译码及发声电路,发出警报。发射电路组成了一个多谐振荡器,可以自由选定一个振荡频率。接收、译码电路这是这个设计的核心,内含红外专用集成电路CX20106,其内包含前放、载波选频、脉冲译码等电路,只有调整好其内的带通滤波器的中心频率0与发射电路的发射频率一致,才能正常工作,此时,若红外接收管收到反射回的红外光,则IC2(CX20106)的输出呈低电位,使IC3触发呈置位状态(平时处低电位),为后级提供工作电压。IC4为语音集成电路,其内存语句为“嘟嘟,请注意”,为高电平触发,得电后把音频信号送给IC5(集成功率放大器LM386),经其放大后驱动喇叭发出报警语音。关键词:红外光,倒车,报警IIAbstractThispapermainlyintroducedonekinddevicewhichbuiltbyinfraredlaunchesandtheacceptingblocks.Thedeviceincludingtwoblocks,oneblockisusedtolaunchmodulatedinfraredlight,theotheroneistheinfraredreceive,decodingandthesoundproducting.whenthisdeviceisworking,thelaunchingdevicelaunchinfraredlightandtheinfratedisacceptedbythereceivingdevice,afterdecoding,thesoundproductionelectriccircuitsendsoutthewarning.Thetransmissioncircuithascomposedamultivibratorwhichcanbesetfrequencyfreely.Thereceiveanddecodingcircuitisthisdesign'skernalwhichincludingspecial-purposeintegratedcircuitCX20106,amplifer,thecarrierchooserandpulsedecoder.Onlyafteradjustingthebandpassfiltercenterfrequencyf0tobeconsistentwiththetransmissioncircuittransmittingfrequency,thedevicecanwork.whentheinfraredreceivingtubereceivestheinfraredlightwhichreflects,IC2(CX20106)'soutputassumesthelowelectricpotential,causesIC3totriggerbeseted.IC4istheICforsounding,It'smemorysentenceis"dudu,attentionplease",forhighleveltriggering,aftertheelectricitygivedtoIC5(integrationpoweramplifierLM386),theloudspeakerwasactuated,thenthewarningwouldbesented.Keyword:Infraredray;Reversethecar;AlertIII目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.IAbstract⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯II第1章概述⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11.1课题背景及研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11.2红外线报警原理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.⋯⋯21.2.1红外线发射电路⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯..⋯21.2.2红外接收、译码及发声电路⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯..⋯3本章小结.........................................................................................................4第2章报警系统的硬件设计⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.⋯52.1CX20106的介绍⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯52.2555介绍⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.⋯⋯82.2.1555简介................................................................................82.2.2用555定时器接成的施密特触发器⋯⋯⋯⋯⋯⋯⋯⋯⋯92.2.3用555定时器接成的单稳态触发器⋯⋯⋯⋯⋯⋯⋯⋯..112.2.4用555定时器接成的多谐振荡器⋯⋯⋯⋯⋯⋯⋯⋯⋯132.3LM386介绍........................................................................................152.4红外光反射测距报警系统的工作原理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.182.4.1系统框图和工作原理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯182.4.240kHz脉冲的产生与红外光的发射⋯⋯⋯⋯⋯⋯⋯..192.5反射红外光的接收及译码⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯19本章小结⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯20第3章系统的调试...