Arduino,Matrix,Max7219 Program

Projects General Guidance
1

Hello guys,
I connected a matrix of LEDs to a max7219 that I have connected to the Arduino through pin DIN, LOAD, and CLK.
I programmed Arduino, and I managed to turn on individual LEDs, or even rows of LEDs; But how do I scroll through the data? .. That is, through the max7219 know that it is possible to scroll through data on the display and the LEDs all seem on, but actually only 8 LEDs are lit, but how can I? .. how do I program arduino, so that if I write on the serial monitor (for example) the letter 'A', the max7219 displays on the matrix and makes scroll? ..

Thank you so much :slight_smile: :slight_smile:

2

Hi Andrea,

You do not need to worry about how to make all leds on at once. It is done through a technique called multiplexing and the max7219 will take care of that for you. What you do have to do is make your sketch translate the character codes from the serial monitor into that shapes of letters, and scroll them. Post your sketch so far (you must use code tags), and a picture of your circuit.

Paul

3

PaulRB:
Hi Andrea,

You do not need to worry about how to make all leds on at once. It is done through a technique called multiplexing and the max7219 will take care of that for you. What you do have to do is make your sketch translate the character codes from the serial monitor into that shapes of letters, and scroll them. Post your sketch so far (you must use code tags), and a picture of your circuit.

Paul

PaulRB:
Hi Andrea,

You do not need to worry about how to make all leds on at once. It is done through a technique called multiplexing and the max7219 will take care of that for you. What you do have to do is make your sketch translate the character codes from the serial monitor into that shapes of letters, and scroll them. Post your sketch so far (you must use code tags), and a picture of your circuit.

Paul

This is the code :

#include "LedControl.h"

LedControl lc1=LedControl(12,11,10,1) ;
//12  DIN
//11  CLK
//10  LOAD


void setup() {
  
  lc1.shutdown(0,false); 
  
  lc1.setIntensity(0,8);  
  
  lc1.clearDisplay(0);    
}

void loop() {
lc1.setLed(0,0,0,true);
lc1.setLed(0,1,1,true);
}

And the photo is the circuit that i have made in a breadboard.
how do I program Arduino so that I write on the serial monitor me a letter and he displays on the matrix and the slide? .. because even I can see a letter, but I can not slide .. and I do not have to use for loops, because the max7219 he should do it .. but how do I do? ..
can you help me please?

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