显示部分-8*8 LED MAX7219 8*8点阵

LED经常被封装成点阵的形式,多排LED或者多列组合在一起。下图是点阵的一种。

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本实验将使用88点阵的升级版模块,配合MAX7219驱动芯片来显示您想要的简单图形。88点阵由64个发光二极管组成,按照传统的矩阵扫描方式,64个发光二极管至少需要16个IO口才能操作。于是我们引入了MAX7219驱动芯片,它通过16位数据串行输入输出方式完成控制64个LED,全程仅需3个IO口。下列程序将依次显示0-9,A-Z,中、国字样。

硬件需求

Arduino板子

8*8点阵模块

杜邦线

电路

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代码

int clk =3;
int cs=4;
int din=5;
unsigned char disp1[38][8]={
{0x3C,0x42,0x42,0x42,0x42,0x42,0x42,0x3C},//0
{0x10,0x18,0x14,0x10,0x10,0x10,0x10,0x10},//1
{0x7E,0x2,0x2,0x7E,0x40,0x40,0x40,0x7E},//2
{0x3E,0x2,0x2,0x3E,0x2,0x2,0x3E,0x0},//3
{0x8,0x18,0x28,0x48,0xFE,0x8,0x8,0x8},//4
{0x3C,0x20,0x20,0x3C,0x4,0x4,0x3C,0x0},//5
{0x3C,0x20,0x20,0x3C,0x24,0x24,0x3C,0x0},//6
{0x3E,0x22,0x4,0x8,0x8,0x8,0x8,0x8},//7
{0x0,0x3E,0x22,0x22,0x3E,0x22,0x22,0x3E},//8
{0x3E,0x22,0x22,0x3E,0x2,0x2,0x2,0x3E},//9
{0x8,0x14,0x22,0x3E,0x22,0x22,0x22,0x22},//A
{0x3C,0x22,0x22,0x3E,0x22,0x22,0x3C,0x0},//B
{0x3C,0x40,0x40,0x40,0x40,0x40,0x3C,0x0},//C
{0x7C,0x42,0x42,0x42,0x42,0x42,0x7C,0x0},//D
{0x7C,0x40,0x40,0x7C,0x40,0x40,0x40,0x7C},//E
{0x7C,0x40,0x40,0x7C,0x40,0x40,0x40,0x40},//F
{0x3C,0x40,0x40,0x40,0x40,0x44,0x44,0x3C},//G
{0x44,0x44,0x44,0x7C,0x44,0x44,0x44,0x44},//H
{0x7C,0x10,0x10,0x10,0x10,0x10,0x10,0x7C},//I
{0x3C,0x8,0x8,0x8,0x8,0x8,0x48,0x30},//J
{0x0,0x24,0x28,0x30,0x20,0x30,0x28,0x24},//K
{0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x7C},//L
{0x81,0xC3,0xA5,0x99,0x81,0x81,0x81,0x81},//M
{0x0,0x42,0x62,0x52,0x4A,0x46,0x42,0x0},//N
{0x3C,0x42,0x42,0x42,0x42,0x42,0x42,0x3C},//O
{0x3C,0x22,0x22,0x22,0x3C,0x20,0x20,0x20},//P
{0x1C,0x22,0x22,0x22,0x22,0x26,0x22,0x1D},//Q
{0x3C,0x22,0x22,0x22,0x3C,0x24,0x22,0x21},//R
{0x0,0x1E,0x20,0x20,0x3E,0x2,0x2,0x3C},//S
{0x0,0x3E,0x8,0x8,0x8,0x8,0x8,0x8},//T
{0x42,0x42,0x42,0x42,0x42,0x42,0x22,0x1C},//U
{0x42,0x42,0x42,0x42,0x42,0x42,0x24,0x18},//V
{0x0,0x49,0x49,0x49,0x49,0x2A,0x1C,0x0},//W
{0x0,0x41,0x22,0x14,0x8,0x14,0x22,0x41},//X
{0x41,0x22,0x14,0x8,0x8,0x8,0x8,0x8},//Y
{0x0,0x7F,0x2,0x4,0x8,0x10,0x20,0x7F},//Z
{0x8,0x7F,0x49,0x49,0x7F,0x8,0x8,0x8},//中
{0x7F,0x41,0x49,0x49,0x49,0x8,0x14,0x63},//国
};
 
void setup(){
  pinMode(cs,OUTPUT);
  pinMode(clk,OUTPUT);
  pinMode(din,OUTPUT);
  Init_MAX7219();
}
void loop(){
  char i,j;
//Write_Max7219(0x0f, 0x00);
//Delay_xms(500);
 
  for(j=0;j<38;j++)
  {
   for(i=1;i<9;i++)
    Write_Max7219(i,disp1[j][i-1]);
   delay(500);
  }
 
}
 
void Write_Max7219_byte(char DATA)        
{
            char i;    
                digitalWrite(cs,0);                
            for(i=8;i>=1;i--)
          {                  
           digitalWrite(clk,0);
            if((DATA&0x80)>0){digitalWrite(din,1);}
            else{digitalWrite(din,0);}
            //提取最高位给DIN端口
            DATA=DATA<<1;//左移一位
            digitalWrite(clk,1);
           }                                
}
void Write_Max7219(char address,char dat)
{
         digitalWrite(cs,0);
         Write_Max7219_byte(address);           //写入地址,即数码管编号
     Write_Max7219_byte(dat);               //写入数据,即数码管显示数字
         digitalWrite(cs,1);                        
}
void Init_MAX7219(void)
{
Write_Max7219(0x09, 0x00);//译码方式:BCD码
Write_Max7219(0x0a, 0x01);//亮度
Write_Max7219(0x0b, 0x07); //扫描界限;8个数码管显示
Write_Max7219(0x0c, 0x01);  //掉电模式:0,普通模式:1
Write_Max7219(0x0f, 0x00);
delay(500); //显示测试:1;测试结束,正常显示:0
}
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