How can i control MAX7219+Arduino to control led matrix?

Hello! I'm trying to control LED matrix (connected to MAX7219 Driver and Ardunio) by Matlab. I want to avoid Simulink and use just code.How can i get to controlling every single led in my matrix(or pins of MAX7219) not just single pin in Arduino?

Answer 1

[Amish]

Hi,

Controlling an LED matrix connected to a MAX7219 driver using MATLAB involves sending the appropriate commands to the MAX7219 via the Arduino. You can do this by writing MATLAB scripts that communicate with the Arduino, which in turn controls the MAX7219.

MAke sure that MAX7219 is properly connected to the LED matrix and the Arduino. Generally, the MAX7219 uses a SPI interface to communicate with the Arduino. Additionally, you will need to have the Arduino Support Package for MATLAB installed.

Here is how you could write a sample code for controlling the LED Matrix:

% Include the Arduino support package
a = arduino('COM3', 'Uno', 'Libraries', 'SPI'); % Adjust 'COM3' and 'Uno' as per your setup

% Initialize SPI communication
spi = device(a, 'SPIChipSelectPin', 'D10'); % Use the appropriate chip select pin as per your setup

% MAX7219 Registers Setup
DECODE_MODE = 0x09;
INTENSITY = 0x0A;
SCAN_LIMIT = 0x0B;
SHUTDOWN = 0x0C;
DISPLAY_TEST = 0x0F;

% Initialize MAX7219
write(spi, [SHUTDOWN, 0x01]); % Exit shutdown mode
write(spi, [DECODE_MODE, 0x00]); % Use no-decode mode
write(spi, [SCAN_LIMIT, 0x07]); % Scan all digits
write(spi, [INTENSITY, 0x08]); % Set intensity (0x00 to 0x0F)
write(spi, [DISPLAY_TEST, 0x00]); % Disable display test

function setLED(spi, row, col, state)    
    currentData = read(spi, row);
    
    if state == 1
        newData = bitset(currentData, col);
    else
        newData = bitclear(currentData, col);
    end
    
    write(spi, [row, newData]);
end

% Example: Turn on the LED at row 3, column 5
setLED(spi, 3, 5, 1);

% Example: Turn off the LED at row 3, column 5
setLED(spi, 3, 5, 0);

For more information, I wold suggest reading through the below mentioned documentation:

https://www.mathworks.com/discovery/arduino-programming-matlab-simulink.html

Hope this helps!