Published November 30, 2020 © GPL3+

Controlling 8x8 Dot Matrix with Max7219 and Arduino

So far I was controling those matrixes with multiplexing. In this video I would use MAX7219 chip to do it

BeginnerFull instructions provided35,367

Controlling 8x8 Dot Matrix with Max7219 and Arduino

Things used in this project

Hardware components

Arduino Nano R3

Maxim Integrated MAXREFDES99# MAX7219 Display Driver Shield

Story

A while back I posted a video showing how to control 8x8 dot matrix without any aditional drivers and libraries.

I created few scetches. One for lighting all LEDs of the matrix one by one, one for displaying the simple bitmap and one for scrolling the sample text.

Generally I had some fun with multiplexing.

I promised a follow up video which would show how to control those matrixes with MAX7219 Driver And here it is.

The full tutorial can be found here:

If you like this content and you want to support me in creating similar videos go to my Patreon webpage

https://www.patreon.com/MariosIdeas

https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=7PD67JWZ9S3EJ&source=url

Code

//Mario's Ideas
//MAX7219 - using Led Control library to display 8x8 bitmap
#include <LedControl.h>

int DIN = 11;
int CS = 7;
int CLK = 13;
LedControl lc=LedControl(DIN, CLK, CS,0);

int Cat[8] ={B10001000,B11111000,B10101000,B01110001,B00100001,B01111001,B01111101,B10111110 };
byte Apple [8]={B00011000,B00001000,B01110110,B11111111,B11111111,B11111111,B01111010,B00110100};

void setup() {
  lc.shutdown(0,false);
  lc.setIntensity(0,0);
  lc.clearDisplay(0);
}
  
void loop(){
  for(int i=0;i<8;i++) lc.setRow(0,i,Apple[i]);
  delay(5000);
  lc.clearDisplay(0);
  for(int i=0;i<8;i++) lc.setRow(0,i,Cat[i]);
  delay(5000);
  lc.clearDisplay(0);
}

// Mario's Ideas
//MAX7219 - using SPI library to display 8x8 bitmap
#include <SPI.h>
#define CS 7

// MAX7219 Control registers

#define DECODE_MODE 9 
#define INTENSITY 0x0A
#define SCAN_LIMIT 0x0B 
#define SHUTDOWN 0x0C
#define DISPLAY_TEST 0x0F

byte Apple [8]={B00011000,B00001000,B01110110,B11111111,B11111111,B11111111,B01111010,B00110100};

void SendData(uint8_t address, uint8_t value) {  
  digitalWrite(CS, LOW);   
  SPI.transfer(address);      // Send address.
  SPI.transfer(value);        // Send the value.
  digitalWrite(CS, HIGH); // Finish transfer.
}
void setup() {
  pinMode(CS, OUTPUT);  
  SPI.setBitOrder(MSBFIRST);   // Most significant bit first 
  SPI.begin();                 // Start SPI
  SendData(DISPLAY_TEST, 0x01);       // Run test - All LED segments lit.
  delay(1000);
  SendData(DISPLAY_TEST, 0x00);           // Finish test mode.
  SendData(DECODE_MODE, 0x00);            // Disable BCD mode. 
  SendData(INTENSITY, 0x0e);              // Use lowest intensity. 
  SendData(SCAN_LIMIT, 0x0f);             // Scan all digits.
  SendData(SHUTDOWN, 0x01);               // Turn on chip.
}
void loop()  {

for (int i=1;i<9;i++) SendData(i, Apple[i-1]);

}

//Mario's Ideas
//MAX7219 - using Led Control library to display all leds one by one
#include <LedControl.h>

int DIN = 11;
int CS = 7;
int CLK = 13;

LedControl lc=LedControl(DIN, CLK, CS,0);



void setup() {

  lc.shutdown(0,false);
  lc.setIntensity(0,0);
  lc.clearDisplay(0);
}

void loop() {
  for(int j=0;j<8;j++){
     for(int i=0;i<8;i++){
       lc.setLed(0,j,i,true);
       delay(100);
       lc.setLed(0,j,i,false);
     }
  }
}

// Mario's Ideas
//MAX7219 - using Led Control library to scroll the sample text
#include <LedControl.h>

int DIN = 11;
int CS = 7;
int CLK = 13;
LedControl lc=LedControl(DIN, CLK, CS,0);

int position=0;

int Marios_ideas [8] [54] ={
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,1,0,0,0,1,0,0,1,1,0,0,1,1,1,0,0,0,0,0,1,1,0,1,0,1,1,0,0,0,0,0,0,1,1,1,0,0,1,1,1,0,0,1,1,0,0,0,1,1,0,0,0,0},
  {0,1,1,0,1,1,0,1,0,0,1,0,1,0,0,1,0,1,0,1,0,0,1,0,1,0,0,1,0,0,0,1,0,1,0,0,1,0,1,0,0,0,1,0,0,1,0,1,0,0,1,0,0,0},
  {0,1,0,1,0,1,0,1,0,0,1,0,1,0,0,1,0,1,0,1,0,0,1,0,1,0,0,0,0,0,0,1,0,1,0,0,1,0,1,0,0,0,1,0,0,1,0,1,0,0,0,0,0,0},
  {0,1,0,0,0,1,0,1,1,1,1,0,1,1,1,0,0,1,0,1,0,0,1,0,0,1,1,0,0,0,0,1,0,1,0,0,1,0,1,1,1,0,1,1,1,1,0,0,1,1,0,0,0,0},
  {0,1,0,0,0,1,0,1,0,0,1,0,1,0,0,1,0,1,0,1,0,0,1,0,0,0,0,1,0,0,0,1,0,1,0,0,1,0,1,0,0,0,1,0,0,1,0,0,0,0,1,0,0,0},
  {0,1,0,0,0,1,0,1,0,0,1,0,1,0,0,1,0,1,0,0,1,1,0,0,1,0,0, 1,0,0,0,1,0,1,1,1,0,0,1,0,0,0,1,0,0,1,0,1,0,0,1,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,1,1,0,0,0,0}
  };


void setup() {

   lc.shutdown(0,false);
   lc.setIntensity(0,0);
   lc.clearDisplay(0);
}

void loop() {
  for (int j=0;j<8;j++){
    for (int i=0;i<8;i++){
    lc.setLed(0,i,j,Marios_ideas[j][(i+position)-abs((i+position)/54)*54]);
    }
  }
  delay(20);
  position=position+1;
}

Credits

mdraber

49 projects • 68 followers

Controlling 8x8 Dot Matrix with Max7219 and Arduino

Things used in this project

Hardware components

Story

Schematics

Schematics

Code

MAX7219 - using Led Control library to display two 8x8 bitmaps

MAX7219 - using SPI library to display 8x8 bitmap

MAX7219 - using Led Control library to display all leds one by one

MAX7219 - using Led Control library to scroll the sample text

Credits

mdraber

Comments

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Controlling 8x8 Dot Matrix with Max7219 and Arduino

Controlling 8x8 Dot Matrix with Max7219 and Arduino

Things used in this project

Hardware components

Story

Schematics

Schematics

Code

MAX7219 - using Led Control library to display two 8x8 bitmaps

MAX7219 - using SPI library to display 8x8 bitmap

MAX7219 - using Led Control library to display all leds one by one

MAX7219 - using Led Control library to scroll the sample text

Credits

mdraber

Comments

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