#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)

// Number of MAX7219 units
const int NUM_DEVICES = 4;

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

// Define bitmaps for heart and face emojis
byte heart[8] = {
  B00000000,
  B01010010,
  B11111111,
  B11111111,
  B01111110,
  B00111100,
  B00011000,
  B00000000
};

byte face[8] = {
  B00000000,
  B01100110,
  B10000001,
  B10000001,
  B10100101,
  B10000001,
  B01000010,
  B00111100
};

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

void loop() {
  // Display heart emoji
  displayEmoji(heart);
  delay(2000); // Display for 2 seconds

  // Clear the display
  clearAllDisplays();
  delay(500); // Short pause before next emoji

  // Display face emoji
  displayEmoji(face);
  delay(2000); // Display for 2 seconds

  // Clear the display
  clearAllDisplays();
  delay(500); // Short pause before looping again
}

// Function to clear all displays
void clearAllDisplays() {
  for (int device = 0; device < NUM_DEVICES; device++) {
    lc.clearDisplay(device);
  }
}

// Function to display an emoji on all 4 units
void displayEmoji(byte emoji[8]) {
  for (int device = 0; device < NUM_DEVICES; device++) {
    for (int row = 0; row < 8; row++) {
      lc.setRow(device, row, emoji[row]);
    }
  }
}