#include <LedControl.h>

// Create an instance of the LedControl library
// Parameters: DIN pin, CLK pin, CS pin, number of displays (1 for a single display)
LedControl lc = LedControl(A10, A9, A8, 4);

void setup() 
{
  // Initialize all displays
  for (int i = 0; i < 4; i++) {
    lc.shutdown(i, false);      // Wake up the MAX7219
    lc.setIntensity(i, 8);      // Set brightness level (0 is min, 15 is max)
    lc.clearDisplay(i);         // Clear the display register
  }
  
  // Display the text "HELLO"
  displayText("HELLO");
}

void displayText(String text) {
  int offset = 0;  // Offset to handle scrolling
  for (int i = 0; i < text.length(); i++) {
    // Clear previous character to avoid overlap
    for (int j = 0; j < 4; j++) {
      lc.clearDisplay(j);
    }
    
    // Display each character across the matrices
    for (int j = 0; j < 4; j++) {
      if (i + j < text.length()) {
        lc.setChar(j, 7 - offset, text[i + j], false);
      }
    }
    
    delay(200);  // Delay for scrolling effect
    offset++;
  }
}

void loop() 
{
  // Empty loop since we're displaying in setup
}