#include <LedControl.h>

// Pin definitions for MAX7219
const int DIN_PIN = 11;  // Data In (MOSI)
const int CS_PIN = 10;   // Chip Select
const int CLK_PIN = 13;  // Clock (SCK)

// Create a LedControl instance
LedControl lc = LedControl(DIN_PIN, CLK_PIN, CS_PIN, 1);

void setup() {
  // Initialize the MAX7219
  lc.shutdown(0, false);       // Wake up the MAX7219 from power-saving mode
  lc.setIntensity(0, 8);       // Set brightness level (0 is min, 15 is max)
  lc.clearDisplay(0);          // Clear the display
}

void loop() {
  // Example graphical test pattern
  for (int row = 0; row < 8; row++) {
    for (int col = 0; col < 8; col++) {
      // Create a checkerboard pattern
      if ((row + col) % 2 == 0) {
        lc.setLed(0, row, col, true);
      } else {
        lc.setLed(0, row, col, false);
      }
    }
  }
  delay(1000);  // Display the pattern for 1 second

  // Clear the display
  lc.clearDisplay(0);
  delay(500);  // Wait for 0.5 second

  // Display a different pattern
  for (int row = 0; row < 8; row++) {
    for (int col = 0; col < 8; col++) {
      // Create a diagonal pattern
      if (row == col || row + col == 7) {
        lc.setLed(0, row, col, true);
      } else {
        lc.setLed(0, row, col, false);
      }
    }
  }
  delay(1000);  // Display the pattern for 1 second

  // Clear the display
  lc.clearDisplay(0);
  delay(500);  // Wait for 0.5 second
}