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摘要：
基于目前广泛应用的传统电铃噪音大，声音刺耳，不符合人们追求。”绿色环保”生活环境的要求，我采用电力电子技术设计了一种新型变流直流电铃，可模拟人工打铃效果，有效地减少了环境噪音污染，有很好的实用价值。在此基础上，我们采用AT89C51单片机设计了一套智能自动打铃系统，根据学校等单位的作息制度自动打铃，从而使我们的设计更加完善。
该系统由三部分组成：程序控制部分、单片机硬件电路部分和电路仿真部分。+5V、+12V直流分别为各部分电路提供电源。变流直流电铃部分主电路拓扑为断续工作的BUCK电路，使得铃声节奏符合人的听觉习惯。单片机部分由三个模块组成：时钟及其显示模块、响铃定时数据表和打铃控制模块。实时时钟随时与打铃定时数据表进行比较，当二者相吻合时，由P3.7脚给出响铃信号，再由单稳确定响铃时间长短，驱动继电器吸合．从而接通电铃电路的主电源，完成自动定时响铃任务。
关键词
单片机、C语言、流程、仿真

目 录

摘要.........................................................................7
关键词......................................................................7
一、单片机的发展历史..........................................................8
二、8051单片机电铃系统硬件设计...............................................8
2.18051单片机的片内资源......................................................9
2.1.18051单片机的片内资源...................................................9
2.1.2、8051单片机片外总线结构...............................................11
2.1.3 控制部件.............................................................13
2.28051单片机时钟电路.......................................................13
2.38051单片机复位电路.....................................................14
2.3.1概述.................................................................14
2.3.2 复位电路的可靠性设计..................................................14
2.48051单片机键盘.........................................................18
2.4.1概述................................................................18
2.4.2键盘系统设计.........................................................19
2.4.3键盘工作方式...........................................................20
2.4.4独立式按键接口设计.....................................................20
2.58051单片机峰鸣器........................................................21
三、8051单片机电铃系统程序设计...............................................22
3.1、C语言概述............................................................22
3.2、程序模块分析.........................................................24
3.3、单片机电铃系统程序.....................................................26
四、电路仿真...............................................................29
4.1PROTEUS软件介绍........................................................29
4.1.1软件概述............................................................29
4.1.2工作界面.............................................................29
4.1.3图形编辑窗口..........................................................30
4.2PROTEUS仿真电路......................................................32
4.3、综合论序.............................................................32
五、总结...............................................................33
参考文献.................................................................34

Abstract:
Is big based on the present widespread application's traditional electric bell noise, the sound is grating, does not conform to the people to pursue.”The green environmental protection” living conditions' request, I used the electric power electronic technology to design one kind of new variable current d-c ringer, might simulate hits the bell effect artificially, reduced the environmental noise pollution effectively, had the very good use value. Based on this, we used at89C51 monolithic integrated circuit to design set of intelligences to hit the bell system automatically, according to unit's and so on school work and rest systems hit the bell automatically, thus caused our design to be more perfect. This system is composed of three parts: Programmed control part, monolithic integrated circuit hardware circuit part and circuit simulation part. +5V, the +12V cocurrent respectively provides the power source be various part of electric circuits. The variable current d-c ringer partial main circuit analysis situs to the intermittent work BUCK electric circuit, cause the ting rhythm to conform to person's sense of hearing custom. The monolithic integrated circuit part is composed of three modules: The clock and the display module, the bell fixed time data sheet and hits the bell control module. The real-time clock momentarily with hits the bell fixed time data sheet to carry on the comparison, when the two tally, gives the bell signal by the P3.7 foot, by Shan Wen determined again the bell time length, actuates the relay to attract gathers. Thus the connection electric bell electric circuit's main power source, completes the automatic fixed time bell task.
key word monolithic integrated circuit, C language, flow, simulation

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