一、LED点阵屏介绍

LED点阵屏发光亮度强，指示效果好，可以制作运动的发光图文，更容易吸引人的注意力，信息量大，随时更新，有着非常好的广告和告示效果。此处就LED点阵屏动态扫描显示作一个简单的介绍。1.LED点阵屏显示原理概述为一种8x8的LED点阵单色行共阳模块的内部等效电路图，对于红光LED其工作正向电压约为1.8v ,其持续工作的正向电流一般10ma左右，峰值电流可以更大。如下图，当某一行线为高电平而某一列线为低时，其行列交叉的点就被点亮，当某一行线为低电平时，无论列线如何，对应的这一行的点全部为暗。LED点阵屏显示就是通过一定的频率进行逐行扫描，数据端不断输入数据显示。LED点阵屏广泛应用于各种公共场合，如汽车报站器、广告屏以及公告牌等LED点阵屏分类按颜色:单色、双色、全彩，按像素:8*8、16*16等(大规模的LED点阵通常由很多个小点阵拼接而成)。

二、显示原理

LED点阵屏的结构类似于数码管，只不过是数码管把每-列的像素以“8”字型排列而已。
LED点阵屏与数码管一样，有共阴和共阳两种接法，不同的接法对应的电路结构不同。
LED点阵屏需要进行逐行或逐列扫描，才能使所有LED同时显示。

三、仿真演示

通过16*16LED点阵循环动态显示15帧图片，实现箭头飞过的动态显示。

四、源程序

#include "reg52.h"

#define MATRIX_Column_Front		P0
#define MATRIX_Column_Back		P1
#define MATRIX_Data_Front		P2
#define MATRIX_Data_Back		P3

unsigned char i = 0;
unsigned char count = 0;
unsigned char offset = 0;

//点阵显示画面，共有15帧
unsigned int code MatrixLED[] = {
0xfffe,0xfffe,0xfffe,0xfffe,0xfffe,0xfffe,0xfffe,0xfffe,
0xfffc,0xfffc,0xfffc,0xfffc,0xfffc,0xfffc,0xfffc,0xfffc,
0xfff8,0xfff8,0xfff8,0xfff8,0xfff8,0xfff8,0xfff8,0xfff8,
0xfff0,0xfff0,0xfff0,0xfff0,0xfff0,0xfff0,0xfff0,0xfff0,
0xffe0,0xffe0,0xffe0,0xffe0,0xffe0,0xffe0,0xffe0,0xffe0,
0xffc8,0xffc0,0xffc0,0xffc1,0xffc0,0xffc0,0xffc8,0xffc0,
0xffb8,0xff90,0xff80,0xff81,0xff83,0xff81,0xff80,0xffb8,
0xfffb,0xff71,0xff20,0xff01,0xff03,0xff07,0xff03,0xff01,
0xfbff,0x71ff,0x20ff,0x01ff,0x03ff,0x07ff,0x03ff,0x01ff,
0xf7ff,0xe3ff,0x41ff,0x03ff,0x07ff,0x0fff,0x07ff,0xf7ff,
0xefff,0xc7ff,0x83ff,0x07ff,0x0fff,0x1fff,0xefff,0xc7ff,
0xdfff,0x8fff,0x07ff,0x0fff,0x1fff,0xdfff,0x8fff,0x07ff,
0xbfff,0x1fff,0x0fff,0x1fff,0xbfff,0x1fff,0x0fff,0x1fff,
0x7fff,0x3fff,0x1fff,0x7fff,0x3fff,0x1fff,0x7fff,0x3fff,
0x7fff,0x7fff,0x7fff,0x7fff,0x7fff,0x7fff,0x7fff,0x7fff
};

//每帧画面LED组成位置序号
unsigned int code MatrixORD[] = {
0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,0x0001,
0x0001,0x0002,0x0001,0x0002,0x0001,0x0002,0x0001,0x0002,
0x0001,0x0002,0x0004,0x0001,0x0002,0x0004,0x0001,0x0002,
0x0001,0x0002,0x0004,0x0008,0x0001,0x0002,0x0004,0x0008,
0x0001,0x0002,0x0004,0x0008,0x0010,0x0002,0x0004,0x0008,
0x0001,0x0002,0x0004,0x0008,0x0010,0x0020,0x0001,0x0002,
0x0001,0x0002,0x0004,0x0008,0x0010,0x0020,0x0040,0x0001,
0x0001,0x0002,0x0004,0x0008,0x0010,0x0020,0x0040,0x0080,
0x0100,0x0200,0x0400,0x0800,0x1000,0x2000,0x4000,0x8000,
0x0200,0x0400,0x0800,0x1000,0x2000,0x4000,0x8000,0x0200,
0x0400,0x0800,0x1000,0x2000,0x4000,0x8000,0x0400,0x0800,
0x0800,0x1000,0x2000,0x4000,0x8000,0x0800,0x1000,0x2000,
0x1000,0x2000,0x4000,0x8000,0x1000,0x2000,0x4000,0x8000,
0x2000,0x4000,0x8000,0x2000,0x4000,0x8000,0x2000,0x4000, 
0x8000,0x8000,0x8000,0x8000,0x8000,0x8000,0x8000,0x8000,
};

//毫秒级延时，用于点阵动态显示
void delay_us(unsigned char t)
{
	while(t--);
}

//点阵显示函数
void MatrixLED_ShowColumn(unsigned int Column,unsigned int Data)
{
  MATRIX_Column_Front = (unsigned char)((Column >>8)&0xFF); //高8位:
  MATRIX_Column_Back = Column&0xFF;    //低8位:
	MATRIX_Data_Front = (unsigned char)((Data >>8)&0xFF); //高8位:
  MATRIX_Data_Back = Data&0xFF;    //低8位:
	delay_us(50);
}

void main()
{
	while(1)
	{
		for(i=0;i<8;i++)	//循环8次，显示8列数据
		{
			 MatrixLED_ShowColumn(MatrixORD[i+offset], MatrixLED[i+offset]);
		}
		count++;			//计次延时
		if(count>50)
		{
			count=0;
			offset+=8;		//偏移+8，切换下一帧画面
			if(offset>112)
			{
				offset=0;   //15帧画面播放完，重新开始播放
			}
		}
	}
}

基于51单片机的飞过的箭头仿真源文件及源程序百度网盘链接：链接：https://pan.baidu.com/s/1rIWxLJG-ELPN_njIYVJKDA 提取码：j3kf

基于51单片机飞过的箭头protues仿真设计

一、LED点阵屏介绍

二、显示原理

三、仿真演示

四、源程序

猜你喜欢