#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x27 or 0x3F (depends on your module)
LiquidCrystal_I2C lcd(0x27, 16, 2);

String message = "Hello, This is LCD Scrolling Demo!   ";  // Add spaces for smooth scroll

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("LCD Scroll Modes");
  delay(2000);
  lcd.clear();
}

void loop() {
  // 1. LEFT SCROLL
  lcd.setCursor(0, 0);
  lcd.print("Left Scroll --->");
  lcd.setCursor(0, 1);
  lcd.print("Scrolling...");
  delay(1000);

  for (int i = 0; i < 16; i++) {
    lcd.scrollDisplayLeft();
    delay(300);
  }
  lcd.clear();
  delay(1000);

  // 2. RIGHT SCROLL
  lcd.setCursor(0, 0);
  lcd.print("<--- Right Scroll");
  lcd.setCursor(0, 1);
  lcd.print("Scrolling...");
  delay(1000);

  for (int i = 0; i < 16; i++) {
    lcd.scrollDisplayRight();
    delay(300);
  }
  lcd.clear();
  delay(1000);

  // 3. MARQUEE SCROLL (continuous text movement)
  lcd.setCursor(0, 0);
  lcd.print("Marquee Scroll:");
  delay(1000);

  for (int pos = 0; pos < message.length(); pos++) {
    lcd.setCursor(0, 1);
    lcd.print(message.substring(pos, pos + 16));  // show 16 chars at a time
    delay(300);
  }
  lcd.clear();
  delay(1000);

  // 4. BOUNCE SCROLL (left-right loop)
  lcd.setCursor(0, 0);
  lcd.print("Bounce Scroll:");
  String text = " BOUNCE DEMO ";
  int textLen = text.length();

  for (int repeat = 0; repeat < 2; repeat++) { // bounce twice
    // Move left
    for (int i = 0; i <= 16 - textLen; i++) {
      lcd.setCursor(i, 1);
      lcd.print(text);
      delay(300);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Bounce Scroll:");
    }
    // Move right
    for (int i = 16 - textLen; i >= 0; i--) {
      lcd.setCursor(i, 1);
      lcd.print(text);
      delay(300);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Bounce Scroll:");
    }
  }
  lcd.clear();
  delay(2000);
}