河南理工大学毕业设计（论文）说明书I摘要随着科学技术的不断发展，促使人们学科学、学技术、学知识的手段多种多样。抢答器作为一种工具，已广泛应用于各种智力和知识竞赛场合。但抢答器的使用频率较低，且有的要么制作复杂，要么可靠性低，减少兴致。做为一个单位若专购一台抢答器虽然在经济上可以承受，但每年使用的次数极少，往往因长期存放使（电子器件的）抢答器损坏，再购置的麻烦和及时性就会影响活动的开展,因此设计了本抢答器。本设计是以六路抢答为基本理念。考虑到依需设定限时回答的功能，利用AT89C51单片机及外围接口实现的抢答系统，利用单片机的定时器/计数器定时和记数的原理，将软、硬件有机地结合起来，使得系统能够正确地进行计时，同时使数码管能够正确地显示时间。用开关做键盘输出，扬声器发生提示。同时系统能够实现：在抢答中，只有开始后抢答才有效，如果在开始抢答前抢答为无效；抢答限定时间和回答问题的时间可在1-99s设定；可以显示是哪位选手有效抢答和无效抢答，正确按键后有音乐提示；抢答时间和回答问题时间倒记时显示，满时后系统计时自动复位及主控强制复位；按键锁定，在有效状态下，按键无效非法。AT89C51；LED数码管；抢答器；计时；报警河南理工大学毕业设计（论文）说明书IIABSTRACTWiththecontinuousdevelopmentofscienceandtechnology,promotelearningscience,scienceandtechnology,knowledgeofthevarietyofmeans.WithatoolforQiangda,whichhasbeenwidelyusedinallkindsofintelligenceandknowledgecontestsoccasions.ButQiangdaisusedforlowerfrequency,andsomeproductioncomplexorlowreliability,andreducedinterest.Asaunit,ifthepurchaseisaQiangda.Althoughtheeconomycanbear,eachyearthenumberisextremelysmall,becauseofthelong-termstorage(electronicdevices)Qiangdafordamagetothepurchaseofthetroubleandtimelinessofactivities,Thedevelopmentwillbeaffected,sothisQiangdaisdesigned.ThisdesignissixroadQiangdaasthebasicconcept.Bytakingintoaccounttheneedforsetingtimeandlimitingtoanswerthefunction,whichusesAT89C51microcontrollerandexternalinterfaceofQiangdasystem,andusesSCMtimer/countertimingandthenumberofmindPrinciple,thesoftwareandhardwareorganicallycombined,whichcouldallowtherighttoconducttime,whilethedigitaldisplaytothecorrecttime.Switchingwiththekeyboardoutput,speakersintips.Atthesametime,systemcanberealized.InQiangdaandwhichonlybeginsaftertheQiangdaonlyeffective,ifatthebeginningofQiangdabeforeQiangdainvalid;Qiangdalimitedtimetoanswerquestionsandthetimecanbesetinthe1-99s;playerswhocanshowthatitiseffectiveandQiangdaQiangdainvalid,rightafterthemusickeystips;QiangdatimetotimeandanswerquestionsDaoJishi,overtime,thesystemautomaticallyresetcontrol