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智力竞赛抢答器--用tpe-d实验箱对智力竞赛抢答器的实现

目  录

引言

一、设计思路············································································································     1

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二、明确设计系统的功能··························································································     1 http://www.paper51.com

  2.1 要实现的功能要求···························································································     1

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  2.2 拟定数字系统的方案·······················································································     1 paper51.com

三、触发器的选定·····································································································     2

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  3.1R-S触发器·········································································································· 2

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 3.2触发器逻辑功能转换·························································································· 2 paper51.com

四、系统工作原理·····································································································    3

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4.1“四人智力抢答器”应实现两点基本逻辑功能···················································· 2

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 4.2工作时的逻辑状态分析······················································································· 2

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五、连接调试············································································································    5 copyright paper51.com

六、总结··················································································································· 5

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参考文献···················································································································    6 copyright paper51.com

致谢··························································································································    7 内容来自论文无忧网 www.paper51.com

引言

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在知识竞赛中,特别是做抢答题时,在抢答过程中,为了知道哪一组或哪一位选手先答题,必须要有一个系统来完成这个任务。如果在抢答中,只靠人的视觉是很难判断出哪组先答题。利用单片机来设计抢答器,使以上问题得以解决,即使两组的抢答时间相差几微秒,也可分辨出哪组优先答题。本文主要介绍了抢答器的工作原理及设计,以及它的实际用途。

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一、设计思路 内容来自论文无忧网 www.paper51.com

1、抢答器同时由4个人或4个组同时进行,分别有4个开关K1~K4。

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2、设置一个清除开关S(即开关K5),该开关由主持人控制。

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3、抢答器锁存与显示功能。即选手按动按钮,锁存相应的编号,并且相对应的小灯泡能够亮,同时发出扬声器的蜂鸣声报警。 http://www.paper51.com

4、当一轮抢答之后,定时器停止、禁止二次抢答。如果再次抢答必须由主持人再次操作"清除"和"开始"状态开关。 http://www.paper51.com

二、明确设计系统的功能要求

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2.1要实现的功能要求

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当主持人宣布开始时,一旦任何参赛者最先按下按钮,则此参赛者对应的指示灯亮起,而其余三个参赛按钮不起作用,信号也不再被输出,直到主持人宣布下一轮开始为止。并且要求有声音提示。

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抢答器主体电路:抢答器的主体电路,主要是由每个抢答组都具有的独立的抢答电路组成。它要求本组抢答电路的输出信号,能关闭其他再抢答的可能性。

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灯光指示电路:当有一个抢答组已抢答时,则该组的抢答灯光指示电路应燃亮,使与会者一目了然地知道本组已经抢答。 内容来自www.paper51.com

显示器仅显示首先抢答者对应指示灯,同时音响电路发出蜂鸣声,而滞后者无显示,无蜂鸣声。这两点功能要求都具有组合逻辑电路和时序逻辑电路的特性。即要输入触发信号,又要输出寄存信号,还要识别控制信号。

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2.2 拟定数字系统的总体方案 内容来自论文无忧网 www.paper51.com

1、清零功能—在常见的触发器中,RS触发器的主要功能是置位(置,“1”)与复位(置“0”或清"0" ), D触发器和JK触发器都带有清除端CLR,它们的功能比较灵活,可实现RS触发器的功能,也可以相互转换,因此选用D触发器或1K触发器都可以满足此功能。 http://www.paper51.com

2、显示功能—可使用四只小灯泡,分别接四个触发器的输出端显示电平的高低,同时将四个输出端与音频信号一起加至控制门电路,即保证在四个拾出端均为低电平时可将控制门锁住,使音频信号不能传输至音响放大电路,而只要一个进出端为高电平时控制门打下,使音频信号加至音响放大电路产生蜂呜声。 内容来自www.paper51.com

3、抢答键控功能—根据其逻辑功能的要求必须将组合逻辑电路和时序逻辑电路相结合,对四个按钮状态在抢答前由一个控制门进行取值采样,将时钟脉冲加至触发器CP端,只要有一个按扭动作,即只要改变一个触发器输入端的状态。则相对应的输出端产生翻转后,瞬间使控制门锁定翻转后的输出状态,此时控制门将时钟脉冲锁住。 paper51.com

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