#include <LiquidCrystal.h>

// Initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// Define 4 custom characters for a larger square shape
byte topLeft[8] = {
  B11111,
  B11111,
  B11111,
  B11111,
  B00000,
  B00000,
  B00000,
  B00000
};

byte topRight[8] = {
  B11111,
  B11111,
  B11111,
  B11111,
  B00000,
  B00000,
  B00000,
  B00000
};

byte bottomLeft[8] = {
  B00000,
  B00000,
  B00000,
  B00000,
  B11111,
  B11111,
  B11111,
  B11111
};

byte bottomRight[8] = {
  B00000,
  B00000,
  B00000,
  B00000,
  B11111,
  B11111,
  B11111,
  B11111
};

void setup() {
  // Set up the LCD's number of columns and rows
  lcd.begin(16, 2);

  // Create custom characters for each part of the square
  lcd.createChar(0, topLeft);
  lcd.createChar(1, topRight);
  lcd.createChar(2, bottomLeft);
  lcd.createChar(3, bottomRight);

  // Display the large square pattern on the LCD
  lcd.setCursor(0, 0);
  lcd.write(byte(0));   // Top-left
  lcd.write(byte(1));   // Top-right
  lcd.setCursor(0, 1);
  lcd.write(byte(2));   // Bottom-left
  lcd.write(byte(3));   // Bottom-right
}

void loop() {
  // Nothing to do in the loop
}