Introduction: Arduino Says: Hello World!

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In this instructable i will show you how to make arduino say ,,Hello world!''. If you are lazy then just watch the video, or read further.

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Step 1: Things You'l Need

  • Arduino UNO
  • Some jumper wires
  • LCD screen
  • Pin headers to solder to LCD pins or just wires.(your choice)
  • 10k ohm potentiometer
  • 200-300ohm resistor
  • Breadboard

Step 2: The Circuit

To connect your LCD to arduino follow these steps:

  • Connect LCD RS pin to arduino pin 12
  • Connect LCD Enable pin to arduino pin 11

  • Connect LCD D4 pin to arduino pin 5

  • Connect LCD D5 pin to arduino pin 4

  • Connect LCD D6 pin to arduino pin 3

  • Connect LCD D7 pin to arduino pin 2

  • Connect 10k ohm potentiometer to +5V and GND, with it's wiper to LCD screen VO pin (a.k.a. pin 3)
  • Connect 200-300ohm resistor to +5V and LCD backlight 15 or 16pin

Step 3: Software

You can find code in arduino program. Go to File>Examples>LiquidCrystal>HelloWorld. Or just copy this:

LiquidCrystal Library - Hello World

Demonstrates the use a 16x2 LCD display. The LiquidCrystal

library works with all LCD displays that are compatible with the

Hitachi HD44780 driver. There are many of them out there, and you

can usually tell them by the 16-pin interface.

This sketch prints "Hello World!" to the LCD

and shows the time.

The circuit:

* LCD RS pin to digital pin 12

* LCD Enable pin to digital pin 11

* LCD D4 pin to digital pin 5

* LCD D5 pin to digital pin 4

* LCD D6 pin to digital pin 3

* LCD D7 pin to digital pin 2

* LCD R/W pin to ground

* LCD VSS pin to ground

* LCD VCC pin to 5V

* 10K resistor:

* ends to +5V and ground

* wiper to LCD VO pin (pin 3)

Library originally added 18 Apr 2008

by David A. Mellis

library modified 5 Jul 2009

by Limor Fried (

example added 9 Jul 2009

by Tom Igoe

modified 22 Nov 2010

by Tom Igoe

This example code is in the public domain.


/ include the library code:

#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {

// set up the LCD's number of columns and rows:

lcd.begin(16, 2);

// Print a message to the LCD.

lcd.print("hello, world!");


void loop() {

// set the cursor to column 0, line 1

// (note: line 1 is the second row, since counting begins with 0):

lcd.setCursor(0, 1);

// print the number of seconds since reset:

lcd.print(millis() / 1000);