学海网

毕业设计-基于AT89C51单片机的新型抢答器设计，共58页，17879字，附电路图及开题报告
摘要：本设计介绍一种利用AT89C51单片机及其外围接口电路实现的抢答系统，具有很强的实用性。本设计功能齐全，可通过LED数码管显示出获得抢答权的编组号，抢答器要有自动定时功能，并且一次抢答时间由主持人任意设定。当主持人启动“开始”键后，定时器自动减计时，并在显示器上显示。同时扬声器上发出短暂声响，并能显示各组选手的得分情况；实现进行倒计时、发光提示、违例判别和不同分值的加减、不同分值的赋初值等功能。主持人的控制台上，设有开始键、加分键、初值加分键、3分键、5分键，方便主持人在整个抢答过程中进行控制，保证了整个抢答过程在公正、公平的环境下进行。
关键词：单片机；AT89C51；LED数码管；竞赛抢答器
Design of A New Answering Device Based on SCM
Student : Zhang Jia
Tutor : Liu Xun Hong
(Oriental Science ＆Technology College of Hunan Agricultural University, Changsha 410128)
Abstract: This design introduces a peripheral interface using AT89C51 Microcontroller and its circuit implementation of the answer in the system, has a strong practical. The design of functional LED digital display can be answer in the right of the grouping number, Responder should have automatic timing, and an answer in time, arbitrarily set by the moderator. When the host started the "Start" button, the timer automatically by time, and on the display. At the same time send a short sound speakers, and players can display the scores of each group; achieve the countdown, luminous tips, scores of illegal discrimination and different addition and subtraction, the different scores assigned initial functions. Host console, with the Start button, plus keys, plus the initial value key, 3 keys, 5 key, easy answer in the course of the entire host to control the entire answer in the process to ensure a just, fair the environment.
Keywords: single slice machine；AT89C51；the LED figures tube;display multi-channel responder.
目 录
摘要…1
关键词…1
1前言……2
1.1单片机的应用及其发展状况2
1.2选题背景及其意义……8
2需求分析……8
3系统方案设计10
3.1抢答器工作流程10
3.2功能模块设计10
3.3方案一……11
3.4方案二11
3.5方案三12
4硬件电路设计13
4.1电源的设计……13
4.2复位电路13
4.3时钟晶振电路……15
4.4抢答电路16
4.5主持人控制台电路17
4.6显示电路17
4.7报警电路设计……21
5系统程序开发22
5.1系统主程序开发22
5.2延时子程序开发25
5.3倒计时程序开发………26
6总结………27
参考文献……27
致谢28
附录29