#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);

void setup() {
  lcd.init();
  lcd.setBacklight(1);
}

void loop() {
  for(int position =0;position<20;position++){
      lcd.setCursor(position,0);
      lcd.write(byte(255));
      lcd.setCursor(position,1);
      lcd.write(byte(255));
      lcd.setCursor(position,2);
      lcd.write(byte(255));
      if(position>0){
        lcd.setCursor(position-1,0);
        lcd.write(byte(255));
       // lcd.setCursor(position-1,1);
       // lcd.write(byte(255));
         lcd.setCursor(position-1,2);
        lcd.write(byte(255));
        
        }
        if(position>1){
          lcd.setCursor(position-2,0);
          lcd.write(byte(255));
          lcd.setCursor(position-2,1);
          lcd.write(byte(255));
          lcd.setCursor(position-2,2);
          lcd.write(byte(255));
        }
        delay(1000);
        lcd.clear();

    }
    for(int position=19;position>=0;position--){
      lcd.setCursor(position,0);
      lcd.write(byte(255));
      lcd.setCursor(position,1);
      lcd.write(byte(255));
      lcd.setCursor(position,2);
      lcd.write(byte(255));
      if(position<19){
        lcd.setCursor(position+1,0);
        lcd.write(byte(255));
       // lcd.setCursor(position+1,1);
       // lcd.write(byte(255));
        lcd.setCursor(position+1,2);
        lcd.write(byte(255));
      }
      if(position<18){
        lcd.setCursor(position+2,0);
        lcd.write(byte(255));
        lcd.setCursor(position+2,1);
        lcd.write(byte(255));
        lcd.setCursor(position+2,2);
        lcd.write(byte(255));
      }
      delay(1000);
      lcd.clear();
    }
  }