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

 int totalColumns = 20;
 int totalRows = 4; 
LiquidCrystal_I2C lcd(0x27,20,4);

String line1 = "HI! I'M INNO:)"; // static
String line2 = "Mabuhay MinSUans!"; // static
String line3 = ("Welcome to BTVTED & BTLED DEPARTMENT   BTLED offer Home Economics and Industrial Arts"); //scroll message");
String line4 = ("                                       BTVTED offer Electronics Technology, Drafting Technology, Electrical Technology, Automotive Technology, Food Service and Management, Fashion and Garments Technology"); //scroll message
 
int stringStart = 0;
int stringEnd = 0;
int scrollCursor = totalColumns;

void setup(){ 
  lcd.init();
  lcd.backlight();
lcd.begin(totalColumns, totalRows);
}
 
 void loop(){ 
lcd.setCursor(3, 0); // Seting the cursor on first row 
lcd.print(line1); // To print line1 message
lcd.setCursor(2, 1); // Seting the cursor on Second row 
lcd.print(line2); // To print line2 message
delay(1500); 
lcd.clear();


lcd.setCursor(scrollCursor, 2);// Seting the cursor on first row and (scrolling from left end to right)
lcd.print(line3.substring(stringStart, stringEnd)); // To print line1 first character "w"
lcd.setCursor(scrollCursor,3);
lcd.print(line4.substring(stringStart, stringEnd));

if (stringStart == 0 && scrollCursor > 0){ 
  scrollCursor --; // Moving cursor from 16 to 0
  stringEnd ++; // Character W, E, L, C, O, M, E, ...

}
  else if (stringStart == stringEnd){ // start all over again
    stringStart = stringEnd = 0;
    scrollCursor = totalColumns;
  } 
  else if (stringEnd == line1.length() && scrollCursor == 0) { // if reach to the end character
    stringStart++;
  }
    else if (stringEnd == line2.length() && scrollCursor == 1) {  // if reach to the end character
    stringStart++;
    }
    else if (stringEnd == line3.length() && scrollCursor == 2) {  // if reach to the end character
    stringStart++;
  } 
  else { // it will print out character from (1 to 16) to end character (this case it's !))
    stringStart++;
    stringEnd++;
  }
}