#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x3F for a 16 chars and 2 line display
void setup()
{lcd.init();
  lcd.clear();         
  lcd.backlight();      // Make sure backlight is on
  
  // Print a message on both lines of the LCD.
  lcd.setCursor(2,0);   //Set cursor to character 2 on line 0
  lcd.print("Hello world!");
  
  lcd.setCursor(2,1);   //Move cursor to character 2 on line 1
  lcd.print("led glow");
 //sets the number 0 digital pin of the Arduino in output mode
pinMode(1,OUTPUT); //sets the number 1 digital pin of the Arduino in output mode
}
 
void loop(){
// red LED lights up
digitalWrite(1,LOW); //green LED goes out
delay(2000);
//red LED goes out
digitalWrite(1,HIGH); //green LED lights up
delay(2000);
}