
点阵电子显示屏制作
目录
摘 要 .......................................................................4
1:方案论证与比较 ............................................................5
1.1 控制器部分 ...........................................................5
1.2 数据存储器...........................................................5
1.3 亮度连续可调.........................................................6
1.4 显示屏驱动电路的选择.................................................6
1.5 键盘的选择...........................................................7
1.6 串行口的选择.........................................................7
2.系统的具体设计与实现 ......................................................7
2.1 系统总框图 ...........................................................7
2.2 硬件部分...........................................................8
2.2.1 采用 16 个 LED8*8 显示屏,构成 16 行*64 列点阵显示 ...............8
2.2.2 LED 显示屏驱动电路 ...........................................9
2.2.3 亮度连续可调 .................................................10
2.2.4 刷新频率的计算...............................................10
2.2.5 键盘.........................................................10
2.3 软件方面...........................................................11
2.3.1 主程序的流程图...............................................11
2.3.2 按键程序....................................................12
2.3.3 行列的扫描..................................................13
2.3.4 人机交互.....................................................14
3.测试、结果及分析 .........................................................15
3.1 基本功能 ............................................................15
3.2 发挥功能部分........................................................15
3.3 其他发挥部分........................................................15
3.4 刷新频率的测试 ......................................................15
3.5 按键的结果测试......................................................16
4.总结 .....................................................................16
参考资料: ..................................................................16
摘 要
本设计使用 ARM2138 开发板作为主控制模块,利用简单的外围电路来驱动 16*64 的点阵
LED 显示屏。利用 ARM 本身强大的功能和大容量的内部存储,可以很方便的实现 ARM 与 PC
机和 SD 卡等外围存储设备的数据传输,并能利用软件方便的进行显示内容的多样变化,另
一方面点阵显示屏广泛的应用于医院、机场、银行等公共场所,所以本设计具有很强的现实
应用性。
Abstract
ARM2138 used as a main controller design and use of simple external circuit
to drive 16*64 the lattice LED display. ARM itself using powerful functions and
capacity of internal storage, it is easy to realize the ARM and PC and SD card for
external storage, data transmission equipment and the ability to use the software
for the convenience of a variety of content changes, the other dot matrix display
widely used in hospitals, airports, banks and other public places. Therefore, the
design has a strong practical application.