Interactive Scrolling LED Text

We will create 3 examples, with the primary one we are going to justify the fundamental rule of the MAX7219, within the second example we are going to see however the scrolling text on the 8×32 light-emitting diode Matrix works, and within the third example, we are going to manage them via Bluetooth and a custom build robot application.

Components Parts needed

Arduino Uno	MAX7219
5V	VCC
GND	GND
D11	DIN
D10	CS
D13	CLK

Components Parts needed

You can get the components from any of the sites below:

8×32 LED MAX7219 Dot Matrix Module…….. [ Buy Here Aliexpress | Amazon ]
Arduino Board ……………………..……………………[ Buy Here Aliexpress | Amazon ]
Breadboard ……………………………………………….[ Buy Here Aliexpress | Amazon ]
Jump Wires ……………….………………………………..[ Buy Here Aliexpress | Amazon ]

*Please note: These are affiliate links. I may make a commission if you buy the components through these links. I would appreciate your support in this way!

Circuit Schematics

Project by Categary

Source Code



/*
  8x32 LED Matrix- Max7219 Tutorial with scrolling text
  
  website: :https://earthbondhon.com/8x32-led-matrix-max7219-tutorial-with-scrolling-text/
 */

#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Max72xxPanel.h>
//Vcc - Vcc
//Gnd - Gnd
//Din - Mosi (Pin 11)
//Cs  - SS (Pin 10)
//Clk - Sck (Pin 13)
const int pinCS = 10;
const int numberOfHorizontalDisplays = 8;
const int numberOfVerticalDisplays = 1;
Max72xxPanel matrix = Max72xxPanel(pinCS, numberOfHorizontalDisplays, numberOfVerticalDisplays);
const int wait = 50; // Velocidad a la que realiza el scroll
const int spacer = 1;
const int width = 5 + spacer; // Ancho de la fuente a 5 pixeles
void setup(){
   Serial.begin(9600);
   matrix. setIntensity ( 1 ) ;  // Adjust the brightness between 0 and 15
   matrix. setPosition ( 0 ,  0 ,  0 ) ;  // The first display is at <0, 0>
   matrix. setPosition ( 1 ,  1 ,  0 ) ;  // The second display is at <1, 0>
   matrix. setPosition ( 2 ,  2 ,  0 ) ;  // The third display is in <2, 0>
   matrix. setPosition ( 3 ,  3 ,  0 ) ;  // The fourth display is at <3, 0>
   matrix. setPosition ( 4 ,  4 ,  0 ) ;  // The fifth display is at <4, 0>
   matrix. setPosition ( 5 ,  5 ,  0 ) ;  // The sixth display is at <5, 0>
   matrix. setPosition ( 6 ,  6 ,  0 ) ;  // The seventh display is at <6, 0>
   matrix. setPosition ( 7 ,  7 ,  0 ) ;  // The eighth display is in <7, 0>
   matrix. setPosition ( 8 ,  8 ,  0 ) ;  // The ninth display is at <8, 0>
   matrix. setRotation ( 0 ,  1 ) ;     // Display position
   matrix. setRotation ( 1 ,  1 ) ;     // Display position
   matrix. setRotation ( 2 ,  1 ) ;     // Display position
   matrix. setRotation ( 3 ,  1 ) ;     // Display position
   matrix. setRotation ( 4 ,  1 ) ;     // Display position
   matrix. setRotation ( 5 ,  1 ) ;     // Display position
   matrix. setRotation ( 6 ,  1 ) ;     // Display position
   matrix. setRotation ( 7 ,  1 ) ;     // Display position
   matrix. setRotation ( 8 ,  1 ) ;     // Display position
}
void loop(){
   String string = " Eng. Tutul live Dhaka Bangladesh";
   long int time = millis();
   while(Serial.available()){
      string += char(Serial.read());
   }
   for(int i = 0; i < width * string.length() + matrix.width() - 1 - spacer; i++){
      matrix.fillScreen(LOW);
      int letter = i / width;
      int x = (matrix.width() - 1) - i % width;
      int y = (matrix.height() - 8) / 2; // Centrar el texto
      while(x + width - spacer >= 0 && letter >= 0){
         if(letter < string.length()){
             matrix.drawChar(x, y, string[letter], HIGH, LOW, 1);
         }
         letter--;
         x -= width;
      }
      matrix.write(); // Muestra loscaracteres
      delay(wait);
   }}

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8×32 LED Matrix MAX7219 Tutorial with Scrolling Text

Interactive Scrolling LED Text

Components Parts needed

Components Parts needed

Circuit Schematics

Source Code

Watch to Youtube Video

13 Comments