#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,20,4);

// Custom character representing the heart shape
byte heartSymbol[8] = {
  B00000,
  B01010,
  B11111,
  B11111,
  B11111,
  B01110,
  B00100,
  B00000
};

const int maxLength = 16;   // Maximum length of scrolling text
char text1[] = "Hello, World!";  // Text for the first row
char text2[] = "Goodbye!";      // Text for the second row

void setup() {
  lcd.begin(20, 4);

  // Create the heart symbol at position 0
  lcd.createChar(0, heartSymbol);

  // Display the heart symbol in full screen
  for (int row = 0; row < 4; row++) {
    for (int col = 0; col < 20; col++) {
      lcd.setCursor(col, row);
      lcd.write(0);  // Display the heart symbol
    }
  }
}

void loop() {
  static int offset1 = 0;  // Scrolling offset for the first row
  static int offset2 = 0;  // Scrolling offset for the second row
  
  lcd.setCursor(2, 1);   // Set cursor position for the first row
  // Print scrolling text for the first row
  for (int i = 0; i < maxLength; i++) {
    lcd.print(text1[(i + offset1) % strlen(text1)]);
    delay(200);  // Adjust the scrolling speed here
    lcd.setCursor(2, 1);   // Reset cursor position for next character
    lcd.print("                  ");  // Clear the previous character
  }
  
  lcd.setCursor(3, 2);   // Set cursor position for the second row
  // Print scrolling text for the second row
  for (int i = 0; i < maxLength; i++) {
    lcd.print(text2[(i + offset2) % strlen(text2)]);
    delay(200);  // Adjust the scrolling speed here
    lcd.setCursor(3, 2);   // Reset cursor position for next character
    lcd.print("                ");  // Clear the previous character
  }
  
  offset1++;  // Update the scrolling offset for the first row
  offset2++;  // Update the scrolling offset for the second row
}