#include <LiquidCrystal_I2C.h>

int totalColumns = 16;
int totalRows = 2;

LiquidCrystal_I2C lcd(0x27, totalColumns, totalRows);  

String scrolLeftToRight = "Selamat Datang";
String scrollRightToLeft = "Universitas Amikom Yogyakarta";

void scrollingRigthToLeftMessage(int row, String message, int delayTime, int totalColumns) {
  for (int i=0; i < totalColumns; i++) {
    message = " " + message;  
  } 
  message = message + " "; 
  for (int position = 0; position < message.length(); position++) {
    lcd.setCursor(0, row);
    lcd.print(message.substring(position, position + totalColumns));
    delay(delayTime);
  }
}

void scrollingLeftToRigthMessage(int row, String message, int delayTime, int totalColumns){
  for (int i=0; i < totalColumns; i++) {
    message = " " + message;  
  }
  message = message + " "; 
  for (int position = message.length(); position >= 0; position-- ){
    lcd.setCursor(0, row);
    lcd.print(message.substring(position, position + totalColumns));
    delay(delayTime);
  }
}

void setup(){
  lcd.init();                    
  lcd.backlight();
}

void loop(){
  lcd.setCursor(0,0);
  scrollingLeftToRigthMessage(0, scrolLeftToRight, 150, totalColumns);
  lcd.setCursor(1, 1);
  scrollingRigthToLeftMessage(1, scrollRightToLeft, 150, totalColumns);
}