Ingo Lohs
Published © GPL3+

MAX7219 - 8x8 Matrix LED

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MAX7219 - 8x8 Matrix LED

Things used in this project

Hardware components

MAX7219
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Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)

Story

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Code

MAX7219 - Alphabet with german umlauts

C/C++
 unsigned char i;
 unsigned char j;
/*Port Definitions*/
int Max7219_pinCLK = 10;
int Max7219_pinCS = 9;
int Max7219_pinDIN = 8;
 
unsigned char disp1[41][8]={
{0x3C,0x42,0x42,0x42,0x42,0x42,0x42,0x3C},//0
{0x8,0x18,0x28,0x48,0x8,0x8,0x8,0x8},//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
// inklusive deutscher Sonderzeichen:
// http://tinkering-arduino.de/blog/2014/03/24/font-generator-fur-das-8x8-led-matrix-display/
// Tipp: den Kopf nach links drehen und das Zeichen 45 Grad gedanklich versetzt entwerfen
{0x42,0x18,0x24,0x24,0x3c,0x42,0x42,0x42},//Ä
{0x42,0x0,0x42,0x42,0x42,0x42,0x42,0x3c},//Ü
{0x42,0x0,0x7e,0x42,0x42,0x42,0x42,0x7e},//Ö
{0xc,0x12,0x22,0x2c,0x22,0x22,0x22,0x20},//ß 
};
 
 
 
void Write_Max7219_byte(unsigned char DATA)
{   
            unsigned char i;
	    digitalWrite(Max7219_pinCS,LOW);		
	    for(i=8;i>=1;i--)
          {		 
             digitalWrite(Max7219_pinCLK,LOW);
             digitalWrite(Max7219_pinDIN,DATA&0x80);// Extracting a bit data
             DATA = DATA<<1;
             digitalWrite(Max7219_pinCLK,HIGH);
           }                                 
}
 
 
void Write_Max7219(unsigned char address,unsigned char dat)
{
        digitalWrite(Max7219_pinCS,LOW);
        Write_Max7219_byte(address);           //address,code of LED
        Write_Max7219_byte(dat);               //data,figure on LED
        digitalWrite(Max7219_pinCS,HIGH);
}
 
void Init_MAX7219(void)
{
 Write_Max7219(0x09, 0x00);       //decoding :BCD
 Write_Max7219(0x0a, 0x03);       //brightness
 Write_Max7219(0x0b, 0x07);       //scanlimit;8 LEDs
 Write_Max7219(0x0c, 0x01);       //power-down mode:0,normal mode:1
 Write_Max7219(0x0f, 0x00);       //test display:1;EOT,display:0
}
 
 
 
void setup()
{
 
  pinMode(Max7219_pinCLK,OUTPUT);
  pinMode(Max7219_pinCS,OUTPUT);
  pinMode(Max7219_pinDIN,OUTPUT);
  delay(50);
  Init_MAX7219();
}
 
 
void loop()
{
   for(j=0;j<41;j++)
  {
   for(i=1;i<9;i++)
    Write_Max7219(i,disp1[j][i-1]);
   delay(500);
  } 		
}

Credits

Ingo Lohs

Ingo Lohs

81 projects • 110 followers
I am well over 40 years and come from the middle of Germany.

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