How to use a 16x2 LCD

#include <LiquidCrystal.h> // include the LCD library

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2; // where the LCD Interface pins are Conneceted to the arduino pins
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);  // initialize the LCD interface pins needed

void setup() {
  lcd.begin(16, 2); //Setup the LCD's columns and rows:
  lcd.print("Hello World !"); //Print "Hello World" to the 16x2 LCD
}

void loop() {
}