论文题目：
河南工学院
毕业设计论文
智能抢答器 144 140415201
系部电子通信工程系专业应用电子技术班级应电学生姓名学号指导教师
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摘要
随着科学技术的发展和普及，各种各样的竞赛越来越多，其中抢
答器的作用也越来越重要。本文设计出以AT89S51单片机为核心的八路抢答器，采用了数字显示器直接指示，自动锁存显示结果，并自动复位的设计思想,它能根据不同的抢答输入信号，经过单片机的控制处理并产生不同的与输入信号相对应的输出信号，最后通过LED数码管显示相应的路数，即使两组的抢答时间相差几微秒，也可分辨出是哪组优先按下的按键，充分利用了单片机系统结构简单、功能强大、可靠性好、实用性强的特点。
本设计是以抢答为出发点。考虑到依需设定限时回答的功能，利用89S51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；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
【关键词】抢答器单片机 LED数码显示管 定时器/计数器 扬声器。
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ABSTRACT
With the development and popularization of science and technology, all kinds of competitions are more and more, and the role of the responder is more and more important. This paper designs eight responder based on AT89S51 microcontroller as the core, adopts digital display direct instructions, automatic latch display results, and design idea of automatic reset, it can answer according to different input signals, through the MCU control processing and produce output different signal corresponding to the input signal, finally display the corresponding the way through the LED digital tube, even if the two groups Qiangda the difference in time a few microseconds, can tell which group is preferred by pressing the button, make full use of the characteristics of the single chip system has the advantages of simple structure, powerful function, good reliability and practicability.
This design is to answer as the starting point. Considering according to need to set the function of the limit answer, answer system based on the MCU 89S51 and peripheral interface, the use of single-chip timer / counter timing and counting principle, the software and hardware organically and makes the system can correctly time, while the digital display to the correct time. Switch with the keyboard output, speaker prompts. At the same time, the system can be realized: in the answer, only after the answer is valid, if at the beginning of pre answer answer invalid; full automatic reset after the system timing and control forced reset; key lock in the
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effective state, the key is invalid illegal
Key Words Responder microcontroller LED digital display tube timer / timer speaker
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