基于单片机的多路抢答器详解.doc

摘 要 本文设计出以STC89C52单片机为核心的四路抢答器。包括以下几个模块：参赛选手及主持人用按键模块、选手抢答成功显示模块、抢答倒计时显示模块、报警系统模块。同时系统能够实现：开始抢答后才有效，开始抢答前无效；抢答限定时间和回答问题的时间设定为15s；抢答成功会显示选手号并有发光二极管提示。该抢答器除具有基本的抢答功能外，还具有计时和报警功能。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，实现报警功能。 本设计的系统实用性强、判断精确、操作简单、扩展功能强。我们采用了数字显示器直接指示的设计思想,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，它充分利用了单片机系统具有结构简单、功能强大、可靠性好、实用性强的特点。 关键词：STC89C52单片机，定时器/计数器，数码管，发光二极管，蜂鸣器等 Abstract This paper?designs four?way responder?based on STC89C52 microcontroller. Includes the following modules:?contestants?and?the host?with the key?module, the contestant vies to answer first?successful?answer in the countdown?display module,?display module,?alarm?module.?The?system can realize?effective :began responder, Qiangda before the start?time and?answer?answer?invalid;the time limit?set for 15s;?successful answer?will show?contestant number?and?a light emitting diode?tips.?The?responder addition to a basic?function outside, still have time and alarm function.?Nobody answer the question on time,?the system will send the buzzer?rang,?suggesting that?host this contest null and void,?realize alarm function. The design of the system?is practical,?accurate judgment,?simple operation, strong function expansion.?Design?we adopted digital display direct instructions,?it can according to?answer?different input signals,?the?control processor?and produce?different output signal?corresponding to the input signal,?and?display the corresponding?number?through the LED digital tube, even if the?time difference between the two groups answer?a few microseconds,?which?can also be?distinguished?group?priority?press?button,?it makes full use of the?single chip microcomputer system?has the characteristics of simple structure,?powerful function,?good reliability,?and strong practicability. Key words：?STC89C52 microcontroller, timer / counter,?digital tube,?light emitting diode,?a buzzer 目 录 摘 要 I 1 绪论 1 1.1单片机抢答器的背景 1 1.2数字抢答器的概述 1 1.