文档介绍：南京航空航天大学
硕士学位论文
LED彩屏控制系统的设计研究
姓名:魏捷
申请学位级别:硕士
专业:机械电子工程
指导教师:吴晓琳;杨明
20080101
南京航空航天大学硕士学位论文
摘要
在国家提出节能环保这一课题之后,LED产品开发得到大力发展。城市亮化
工程促进了大型彩屏墙的设计与开发,使其有了相当广阔的发展空间。针对目前
国内彩屏墙控制系统兼容性差、扩展性不好等问题,提出了本课题的研究。
本文介绍了该 LED 彩屏墙控制系统的设计研究过程。该控制系统采用了灯
光控制行业最常用也是兼容性最好的 DMX512 协议作为该控制系统的通讯传输
协议,在 C 环境下设计了控制器和终端的通讯程序,实现了控制器和终端的通
讯。终端采用串行输出,通过移位寄存器串接的方式使单片机的 I/O 口得以扩展,
使单个单片机可以驱动多组 LED 象素点。显示模块针对该系统在实际应用中所
要达到的效果,对传输数据的转换形式做了相应的改进,将脉宽调制技术(PWM)
运用于实现灯光亮度和 RGB 三色按比例混合的显示中,使显示图像达到了 16
级深度。保证了稳定、连续、渐变的图像效果。
文中详细叙述了整个系统的研究调试过程,并将在调试过程中碰到的问题和
改进的方法加以论述,给碰到相同问题的同行以参考和借鉴。并且,在文中的总
结和展望部分提出了该系统的几个拓展方向,下一步在实际运用中可以使该控制
系统更具有实用性和通用性。
关键词:DMX512;单片机;LED;彩屏;渐变效果
i
LED 彩屏控制系统的设计研究
ABSTRACT
After the nation puts forward the topic of economizing on energy and
environmental protection, the development of the LED products gets to develop
strongly. The city bright project promotes the designing and development of the large
and colorized screen and makes it have very large development space. Aimed at some
problems that currently, the control system of the local colorized screen doesn’t have
patibility and expansibility, it puts forward the research of this topic.
This text introduces the designing research process of the control system of the
LED colorized screen. This control system adopts DMX512 protocol which is the
most mon use and has the patibility in the light control area as the
munication of this control system. This control system designs a
communication procedure of the top and bottom MCU under the C environment and
makes munication of the top and bottom MCU normally. The bottom MCU
adopts the serial exportation, expands the I/O of MCU in the way of serial link of the
shift register and make the MCU be able to drive several LED pels. Aimed at the
result which is attained from the system in physically applied, the showing mold
makes a corresponding improvement on the transmission of data conversion form.