自動化测控专业毕业设计论文模板.doc

LED点阵显示屏的设计 系 别 信息工程系 专 业 班 级 学 号 姓 名 指导教师 负责教师 沈阳航空学2013年月摘 要 用来驱动×32的LED点阵显示屏。显示个16×16点阵汉字×32点阵汉字，通过上位机软件修改显示内容和显示效果。使LED显示系统能掉电存储个字符因为采用串行传输方式，系统的可扩展性得到提升，多个显示单元的级联。点阵显示屏不仅可以用于室内环境还可用于室外环境具有很强的现实应用性。 关键词：单片机 Abstract This design uses AT89S52 MCU as the main controller,uses the special driving chip 4953 and the decoder chip to drive the 128×32 LED dot matrix display monitor. Series of AT29C parallel FLASH memory expansion used to store character data and control information.Expanded external parallel static RAM in order to compensate the shortage of RAM inside the 51-series MCU, the external RAM assisted the Main Control MCU to accomplish each kind of trundle demonstration effect. The coordination between the Main Control MCU and The Communication MCU, update the character data and the control information as well as the time data and the temperature information real-time gathering. This LED display system can display two lines of 16 16×16 lattice Chinese characters or one line of 4 32×32 lattice Chinese characters,the current time and temperature can be displayed by this system,too. The display contents and the effects can be changed through the upper-computer software. Extended parallel FLASH memory, so that the LED display system can save 2000 characters when the power is off. Each LED display unit is independent of each other,and uses the serial transmission mode to display the character data, therefore the extensibility of this system had greatly ascend, multiple LED display units of cascade is very convenient.LED dot matrix display products not only can be used for indoor environment, but also for complex, harsh outdoor environments, it has a strong practical applicability. Keywords: LED dot matrix;Microprocessor; Parallel store; Dynamic scanning 目 录 1 论 1 1.1 课题背景和研究的意义 1 1.2 LED点阵显示屏的发展过程 1 1.3 LED点阵显示屏的分类 1 1.4 LED显示屏的应用实例 2 1.5 课题任务及要求 2 2 LED显示屏的总体方案设计与分析 3 2.1 显示单元的设计 3 2.2 传输方式和可扩展性的设计 3 2.3 扫描方式的设计 3 2.4 滚屏的实现