#include <LiquidCrystal.h>
LiquidCrystal lcd(13,12,11,10,9,8,7);

void setup() {
  // put your setup code here, to run once:
  lcd.begin(16,2);
  lcd.clear();

}

void loop() {
  // put your main code here, to run repeatedly:
 lcd.setCursor(0,1);
 lcd.print("Hello world");
 delay(2000);
 lcd.clear();
 
}