1、 - 1 - 具有具有报警报警的的功能的八路数显抢答器的设功能的八路数显抢答器的设 计计 摘要摘要: : 本文介绍了一种用74系列常用集成电路设计的数码显示八路抢答器的电路组 成、设计思路及功能。该抢答器除具有基本的抢答功能外,还具有定时、计时和 报警多重功能。主持人通过时间预设开关预设供抢答的时间,系统将完成自动倒 计时。若在规定的时间内有人抢答,则计时将自动停止;若在规定的时间内无人 抢答, 则系统中的蜂鸣器将发响, 提示主持人本轮抢答无效, 同时实现报警功能。 关键词关键词: 八路, 抢答器, 设计,报警 Abstract: In this paper, the electric cir
2、cuit and designing thought of an answering racer based on the common-used series of 74 IC with 8-wire is introduced, and its function is also described. The answering races function includes timing, counting, and alarming, besides the basic function of an answering racer. The host sets the provided
3、time for the answering race through the time-setting switch, after this the system will count down the time automatically. If anybody answer the question on time, the counting of time will stop; If nobody answer the question on time, the alarm will give out some sound, helping the host know the race
4、 in this turn is of no use, so the function of alarming is achieved. Keywords: 8-wire, answering racer, design, timing, counting, alarming 1 1 课题背景课题背景 工厂、 学校和电视台等单位常举办各种智力竞赛, 抢答记分器便成为必要设 备之一。在我校举行的各种竞赛中我们经常看到有抢答的环节,举办方多数采用 让选手通过举答题板的方法判断选手的答题权, 这在某种程度上会由于主持人的 主观误断带来比赛的不公平性。为解决这个问题,我就此问题制作一个低成本但 又能满足这些活动需要的八路数显抢答器,同时也作为我的毕业设计课题. 2、设计任务及系统功能简介设计任务及系统功能简介 1.基本功能: (1) 抢答器同时供 8 名选手或 8 个代表队比赛,分别用 8 个按钮 S0 S7 表 (2) 设置一个系统清除和抢答控制开关 S,该开关由主持人控制。 (3) 抢答器具有锁存与显示功能。即选手按动按钮,锁存相应的编号,扬声 - 2 - 器发