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

// Declare LCD object
LiquidCrystal_I2C lcd(0x27, 20, 4);
// Declare rotary encoder object
Encoder myEnc(3, 2);
// Declare variables to keep track of the cursor position
int cursorX = 0;
int cursorY = 0;
int previousEncoderValue = 0;

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.clear();
  // Print some initial text on the LCD
  lcd.print("Welcome to Arduino");
  lcd.setCursor(0, 1);
  lcd.print("Scrolling Display");
  lcd.setCursor(0, 2);
  lcd.print("Using Rotary Encoder");
}

void loop() {
  // Read the value of the rotary encoder
  long encoderValue = myEnc.read();
  // Check if the encoder has been turned
  if (encoderValue != previousEncoderValue) {
    // Check if the encoder has been turned up
    if (encoderValue > previousEncoderValue) {
      cursorY--;
      // Check if the cursor has gone past the top of the screen
      if (cursorY < 0) {
        cursorY = 3;
      }
    } else {
      // Encoder has been turned down
      cursorY++;
      // Check if the cursor has gone past the bottom of the screen
      if (cursorY > 3) {
        cursorY = 0;
      }
    }
    lcd.setCursor(cursorX, cursorY);
    previousEncoderValue = encoderValue;
  }
}