双色点阵LED研究及应用_毕业论文.doc

目 录 摘 要······························································1 Abstract···························································2 1 绪论······························································3 1.1 课题背景····················································3 1.1.1 选题背景·················································3 1.1.2 国内外研究现况············································3 1.2 主要内容····················································4 2 系统硬件设计····················································6 2.1 系统硬件方案················································6 2.1.1 系统主控制器选择··········································6 2.1.2 总体硬件方案·············································7 2.2 硬件设计原理图··············································8 2.3 控制单元设计················································8 2.3.1 AT89C51介绍·············································8 2.3.2 控制电路设计·············································11 2.4 驱动电路设计···············································12 2.5 LED点阵显示屏·············································14 2.6 PCB图的绘制···············································15 2.6.1 Protel软件介绍···········································15 2.6.2 Protel软件操作···········································16 3 系统软件设计···················································22 3.1 单片机编程语言选择·········································22 3.2 系统软件方案···············································22 3.3 程序设计···················································23 3.3.1 显示方式比较············································24 3.3.2 显示程序设计············································24 4 结果调试与讨论·················································27 结 论·····························································28 致 谢·····························································29 参考文献··························································30 附 录·····························································31 附录1 硬件原理图········································