基于单片机抢答器的设计.doc

基于单片机抢答器的设计 摘??要 数字抢答器是由扩展电路和主体电路构成的。在显示器上输出的参赛队的输入信号是由优先编码电路、锁存器和译码电路等生成的；扩展电路是在显示器上输出实现计时功能，由定时电路、译码电路将秒脉冲产生的信号构成。主体电路是由控制电路、主持人开关启动报警电路构成。数字抢答器成形是经过布线、调试和焊接等工作。单片机为了使外围电路的实现更加简单，简化了外围硬件电路，把很多任务都交给了软件编程。单片机不仅应用方便，而且体积小价格低，还很稳定可靠。如果说应用程序赋予了单片机新的“生命”，那么抢答系统“身躯” 是由单片机系统的硬件结构给予了，这样就使其在一般的抢答器面前具有成本低、电路简单和运行可靠等优点。抢答器是选手做抢答题时便于选手进行抢答的，抢到题的选手便要回答问题。抢答器不仅考验选手应该具备足够的知识面还考验选手的反应速度同时还需要一定的勇气和技巧。对选手们都是公平公正的，因为他们都站在同一个起跑线上。 关键字：定时电路 抢答电路 报警电路 ABSTRACT Digital vies by expansion circuit and regulator is composed of main circuit. On the display output team input signal is from priority coding circuit, latches and decode circuit generated; Expansion circuit is on the display output of timing function by timing circuit, decoding, circuit will seconds pulse signal constitutes. Main circuit of control circuit, host switches on the alarming circuit constitutes. Digital contest device after wiring, commissioning forming and welding etc. SCM in order to make the realization of buffer circuit for more simple, simplified the hardware circuit, put a lot of outer task was to the software programming. SCM not only convenient for use, small volume and price is low, is stable and reliable. If the application endowed with single-chip microcomputer new life, then scare-answering system body is the hardware structure by single-chip microcomputer system gives, thus make it before the contest is in general with lower cost and circuit is simple and reliable operation, etc. Are the players do responder for forgetting the responder players when, grab the player will answer questions. Contest is not only test players should have enough knowledge also test players speed of response also need a certain amount of courage. For the players are a fair and impartial, because they all stand in the same starting line. Key Words: timing circuit contest circuit alarm circuit 目录 第一章 绪论 4 1.1 单片机抢答器的背景 4 1.2 单片机抢答器的意义 5 1.3 抢答器的应用 5 第二章 抢答器的概述及制作要求 7 2.1 抢答器的概述 7 2.2 设计任务、要求和知识点 7 第三章 单片机芯片的选择及模