| Abstract：In this paper, the electric circuit and designing thought of an answering racer based on the common-used series of 74 IC with 6-wire is introduced, and its function is also described. The answering race’s function includes timing, counting, and alarming, besides the basic function of an answering racer. The host sets the provided 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 by LED helping the host know the race in this turn is of no use, so the function of alarming is achieved. Keywords: 6-wire,74IC, answering racer, rush answer, timing, counting, alarming 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六路抢答 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，则系统中的报警LED灯 将亮，提示主持人本轮抢答无效，实现报警功能。 关键词: 六路,74系列，抢答器, 抢答,定时，计时，报警 一、引言 日常生活中经常举办各种竞赛，大多都要用到抢答器，计时器， 记分器。而专门厂家生产的这些设备价格近千元，价格高昂，不适用 于各种小型比赛。鉴于此，拟设计一种价格相对低廉，功能较齐全的 抢答器。此抢答器可广泛应用与各种比赛。 二、设计任务及系统功能简介 （1） 抢答器同时供 4--6 名选手比赛。 （2） 设置系统清零和抢答控制开关，由主持人控制。 （3） 抢答器具有显示功能。即选手按动按钮，即优先在数码管上 显示选手号码。，优先抢答选手的编号一直保持到主持人将系统清 除为止。而其他选手再按动按钮，则数码管上不在有相应显示。 （4） 抢答器具有定时抢答功能， 且一次抢答的时间由主持人设定 （如 60 秒）。当主持人启动"开始"键后，定时器进行减计时。 （5） 参赛选手在设定的时间内进行抢答，抢答有效，定时器停止 工作，显示器上显示选手的编号和抢答的时间，并保持到主持人将系 统清除为止。如果定时时间已到，无人抢答，本次抢答无效，系统报 警并禁止抢答，定时显示器上显示 00。 三、实现的原理与电路 1．多功能抢答器总体方框图 如图 1 [原文截取] Abstract：In this paper, the electric circuit and designing thought of an answering racer based on the common-used series of 74 IC with 6-wire is introduced, and its function is also described. The answering race’s function includes timing, counting, and alarming, besides the basic function of an answering racer. The host sets the provided 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..... |
多功能数显抢答器设计书
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