（毕业设计论文）《中文广告灯箱设计》.doc

河南工业贸易职业学院毕业设计（论文） PAGE PAGE I 河南工业贸易职业学院 机电系 08电子102 摘 要 和其它电子产品一样，点阵LED显示屏的发展十分迅速。它是多种技术综合应用的产品，涉及光电子学、半导体器件、数字电子电路、大规模集成电路、单片机及微机等各个方面，既有硬件又有软件。由于其醒目、内容灵活多变等特点，点阵LED显示屏的应用领域己经遍及交通、证券、电信、广告、宣传等各个方面，其发展可以说基本上与世界水平同步，至今己经形成了一个相当具有发展潜力的产业。 针对以往的点阵LED显示器需重复设计、成本高等问题，提出了一种模块化设计的点阵LED显示器，可以实现灵活配置、脱机运行、特效显示等。 本系统采用AT89S52单片机和C语言程序实现对显示屏的控制，将点阵LED和按键作为人机交互界面，用单片机的串口和PC机通信。 该系统中每个16×16 LED点阵模块（4块8×8 LED点阵）均由1个单片机（89S52）控制将32字节的显示缓冲区中的内容进行动态显示，并且每个单片机有唯一的地址（存在代码区），所有模块与总控单片机均通过串行口连接至总线上，总控单片机将处理后的字模通过串行总线发送至每个模块的显示缓冲区（32字节）中，此时每个模块便可以显示出相应的内容，从而达到模块化的LED大屏幕显示目的。 当使用上位机对模块进行操作时，将上位机取代原总控芯片，并将串口通信的RS232电平与TTL电平进行互转即可。 由此可得模块化的16×16 LED与89S52单片机通过通信接口扩展和动态扫描方式可实现大点阵、多模式的汉字及图形显示。 关键词：AT89S52单片机； LED点阵；串口通信；动态显示；C51语言 Abstract Like other electronic products, lattice LED display is developing very fast. It is the products that comprehensive application of technology, involving photonics, semiconductor devices, digital circuit, large scale integrated circuit chip microcomputer, etc., both hardware and software. Due to its content, marked characteristics, such as flexible lattice LED display applications throughout the traffic, telecom, advertising, promotional and other aspects, the development and the world level synchronization can basically has formed a quite a potential industry. The past to repeat the lattice LED display design, high cost, this paper proposes a modular design of the lattice LED display, can realize flexible configuration, operation, special show offline. The system uses AT89S52 SCM and C language program to control the display, the serial ports of MCU to communicate with PC and bitmap LED and buttons as man-machine interface. This system in every 16*16 of LED dot matrix modules composed by four 8 * 8 LED dot matrix; One MCU 89S52 controls of 32 bytes ,will display the contents of the dynamic buffer, and each has a unique address (SCM). All existing code modules and control chip are through serial connection to a bus master microcontroller will han