摘要门铃是人们生活中的常用物品，本题要求用电子器件设计制作一个密码门铃的控制电路，使之输入正确的代码时，输出锁信号以推动执行机构动作，并用电磁阀开启及绿色发光二极管发亮来表示开锁。本文的电子密码门铃利用数字逻辑电路，实现对门的电子控制，并且有各种附加电路保证电路能够安全工作，具有极高的安全系数。随着人们生活水平的提高，如何实现家庭防盗这一问题也变的尤其的突出，传统的机械锁由于其构造的简单，被撬的事件屡见不鲜，电子锁由于其保密性高，使用灵活性好，安全系数高，受到了广大用户的亲昵。设计本课题时构思了两种方案：一种是用以AT89C2051为核心的单片机控制方案；另一种是用以74LS112双JK触发器构成的数字逻辑电路控制方案。考虑到单片机方案原理复杂，而且调试较为繁琐，所以本文采用后一种方案ABSTRACTThedoorbellispeoplelifemediumofincommonuseproduct,subjectrequestuseanelectronicssparepartadesigncreationapassworddoorbellofcontrolelectriccircuit,makeofimportationexactitudeofcode,outputlocksignalwithpushperformanceorganizationaction,andOpenwiththeelectromagnetismvalveandthegreengiveoutlightdiodetobecomebrighttomeantoopenalock.Thetextualelectronicspassworddoorbellmakeuseofnumerallogicelectriccircuit,realizationtheoppositedoorofelectronicscontrol,andhavevariousadditionalelectriccircuitassuranceelectriccircuitcansafetywork,haveveryGaoofsafetycoefficient.Alongwithpeoplelifelevelofexaltation,howrealizationthefamilyguardagainsttheftthisproblemalsochangeofparticularlyoutstanding,traditionofmachinelockbecauseofitstructureofsimple,ispryoftheaffairsoftenseenotfresh,electronicslockbecauseofitsconfidentialityGao,usevividgood,safetycoefficientGao,wassubjectedtoalargecustomerofveryintimate.Designorigintopicconceivedoutlinetwokindsofproject:1kindisinordertotheAT89C2051isthelistsliceofthecoremachinecontrolproject;Anotherisinorderto74LS112pairtheJKtriggeramachineconstituteofnumerallogicelectriccircuitcontrolproject.Inconsiderationoflistslicethemachineprojectprinciplecomplications,andadjusttotrymoretedious,sothisliterarygraceusebehindakindofproject目录第1章概述……………………………………………..1第2章总体方案的设计…………………………………………..221设计思路………………………………………………………………………….22.2总体方框图………………………………………………………………………2第3章设计原理分析……………………………………………….33．1、主要器件及电路介绍……………………………………………………………33．2、555时控密码电子门铃电路…………………………………………………43．3、键盘输入、密码修改、密码检测、开锁及执行电路……………………73．4、计数器电路功能介绍…………………………………………………………113．5、双稳态器件的分类…………………………………………………………173．6、UPS电源介绍…………………………………………………………………22.3.7用电源电路……………………………………………………………………25.3.8整体电路连接……………………………………………………………………263.9元器件明细表…………………………………………………………………27.3.10设备清单………………………………………………………………………283．101电路的调试…………………………………………………………………29第4章实验结果分析…………………………………………….29结束语…………………………………………………………….30参考文献…………………………………………………………….31致谢………………………………………………………………...32第1章概述1.1选题背景目前，民户住宅多数门口都设有门铃，有人按门铃时，主人往往要观察是熟客还是陌生人后才决定是否应该开门，不...
