#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 sine wave and arrows
byte sineWave[8] = {
  B00000000,
  B00011000,
  B00100100,
  B01000010,
  B10000001,
  B01000010,
  B00100100,
  B00011000
};

byte arrowLeft[8] = {
  B00001000,
  B00001100,
  B00001110,
  B11111111,
  B00001110,
  B00001100,
  B00001000,
  B00000000
};

byte arrowRight[8] = {
  B00010000,
  B00011000,
  B00011100,
  B00011110,
  B11111111,
  B00011110,
  B00011100,
  B00011000
};

byte arrowUp[8] = {
  B00001000,
  B00011100,
  B00111110,
  B01111111,
  B00000000,
  B00000000,
  B00000000,
  B00000000
};

byte arrowDown[8] = {
  B00000000,
  B00000000,
  B00000000,
  B01111111,
  B00111110,
  B00011100,
  B00001000,
  B00000000
};

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 left arrow
  displayPattern(arrowLeft);
  delay(2000); // Display for 2 seconds

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

  // Display right arrow
  displayPattern(arrowRight);
  delay(2000); // Display for 2 seconds

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

  // Display up arrow
  displayPattern(arrowUp);
  delay(2000); // Display for 2 seconds

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

  // Display down arrow
  displayPattern(arrowDown);
  delay(2000); // Display for 2 seconds

  // Clear the display
  clearAllDisplays();
  delay(500); // Short pause before displaying sine wave

  // Display sine wave
  displayPattern(sineWave);
  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 a pattern on all 4 units
void displayPattern(byte pattern[8]) {
  for (int device = 0; device < NUM_DEVICES; device++) {
    for (int row = 0; row < 8; row++) {
      lc.setRow(device, row, pattern[row]);
    }
  }
}