本科论文毕业设计
题 目：基于单片机的广告流水灯控制设计专业名称：学生姓名：学生学号：指导老师：毕业时间：
电子信息工程
基于单片机的广告流水灯控制设计
摘要：流水灯在工业现场、信号指示和广告牌等很多方面都有应用，采用单片机来控制流水灯方式更灵活，功能更强大。随着社会的发展点阵式LED应用范围更广，所以本论文通过8×8LED显示屏相关电路设计制作一个16×16LED显示屏。
Proteus软件可进行单片机仿真，本文用Proteus软件设计汉字LED点阵的动态显示，利用AT89C51作为主控芯片，74LS154译码器，74HC595作为驱动芯片，给出完整的设计电路和仿真程序代码，通过运行显示汉字。本设计体积小，硬件少电路结构简单且容易实现。
关键词：单片机；8×8 LED；74HC595；74LS154
The Water Lamp Controller Design Based on MCU
Abstract:Water lamps in the industrial field, such as signaling and billboards have many applications,using MCU to control the flow lamp is more flexible and more powerful functionality.Along with society's develop Dot-matrix LED application, so this paper 8 * 8Dot-matrix LED related circuit design 16*16 Dot-matrix LED.
Proteus software can undertake single-chip microcomputer simulation, this article with the Proteus software design characters of LED dot matrix, using dynamic display of the main control chip 74HC595and74LS154 as AT89C51 as driving chip, gives a full circuit design and simulation program code, running the show characters. This design, small size, hardware circuit structure is simple and less easy implementation. Keywords: MCU; 8×8 LED; 74HC595; 74LS154
目录
1 引言.............................................................. 1 2显示原理 .......................................................... 2
2.1 LED点阵模块结构............................................. 2
2.1.1 LED 及 LED 显示屏...................................... 2 2.1.2 LED阵列 ............................................... 2 2.2 LED汉字显示方式............................................. 3
2.2.1 汉字字模............................................... 3 2.2.2 汉字扫描移动........................................... 4
3总体设计 .......................................................... 6
3.1 方案选择 ................................................... 6
3.1.1 主控单元的选择......................................... 6 3.1.2 扫描方式选择........................................... 6 3.1.3 扫描芯片的选择......................................... 7 3.2 设计思路 .................................................... 7 3.3 总体框图 .................................................... 7 4 芯片介绍和各系统设计.............................................. 8
4.1 芯片介绍 .................................................... 8
4.1.1 AT89C51单片机介绍 ..................................... 8 4.1.2 74HC595寄存器 ........................................ 10 4.1.3 74LS154译码器 ........................................ 12 5 各系统设计 ................................................... 12
5.1 最小系统................................................ 12 5.2 驱动电路................................................ 12 5.3 16×16 LED.............................................. 13 5.4 键盘控制电路设计........................................ 13
6 系统电路图....................................................... 14 7 程序设计......................................................... 14
7.1 主程序流程图 ............................................... 14 7.2 显示驱动程序流程图 ......................................... 15 8 系统调试......................................................... 16
8.1 软件使用 ................................................... 16 8.2刷新频率计算................................................ 18 8.3显示效果处理................................................ 18 8.4结论分析.................................................... 18 9 结束语........................................................... 19 参考文献........................................................... 20 谢辞............................................................... 21 附录1 程序 ........................................................ 22 附录2 原理图 ...................................................... 27 附录3 PCB图....................................................... 28 附录4 实物图 ...................................................... 29
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