#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

void setup() {
  pinMode(2, INPUT);
  pinMode(4, OUTPUT);
 lcd.init();
 lcd.backlight(); 
}//////////////////////end setup

void loop() {
 lcd.setCursor(0,0);
 lcd.print("Hello");
 int x = digitalRead(2);
 if(x==1){
  digitalWrite(4, HIGH);
 }else{
  digitalWrite(4, LOW);
 }
}//////////////////////end loop