LCD Dispaly on Arduino UNO




List of hardware:

1 arduinio
2 bread board
3 LCD display 16*2
4 10k register

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Step 1: Pinconfiguration

Set up the pin according to the picturre,

consider that other object as 10k register.

This Programme available on Arduino LCDLibrary.


  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
* 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:

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    16 Discussions


    1 year ago

    I want to let the led screen act like dye for playing catan, what would the code to be used for the lcd screen be?


    4 years ago on Introduction

    can we change the pin setup and modify the code? example: set the pin connection to lcd to 13,12, 11, 10,9, 8 and modify the library int into LiquidCrystal lcd(13,12,11,10,9,8); ? and Why theres a 10k variable resistor? where can we use it?

    1 reply

    Reply 3 years ago

    yes you can. just control where you put your wire on the Arduino board.

    10k variable resistor is used to adjust the light on the LCD. It's not mandatory but if you don't choose to use it, you have to change some connections.


    3 years ago

    Hi, Can any one suggest, how we can reset the second line in LCD display if we have more 16 x2 display. suppose that we have to display 0 to 10 to 0 in loop then its 0 to 10 its fine but after reset it start to print like 00, 10,20,30,40....means only second digit changing but first digit don't get reset.

    1 reply

    Reply 3 years ago

    lcd.clearLine(num) with 'num' as number line

    ex : lcd.clearLine(2) -> this will blank line 2 by writing spaces to the entire line. The cursor is then returned to the beginning of the selected line.

    An other way is to do it 'manually' like this :

    lcd.setCursor (0,1); // go to the first case of the line 2,

    lcd.print(" "); //16 spaces -> erase text


    lcd.print("new text");


    To clear the LCD screen you can use :

    lcd.clear(); // clear the display

    It will clear the LCD screen and position the cursor in the upper-left corner

    Or do it 'manually' by positionning the cursor on the beginning of the wished line and writting spaces.


    4 years ago on Introduction

    i use your code and connections on 20*4 jhd629-204A lcd with arduino uno.

    It works i recieve text and stuff on the screen what i want but it can't light up the lcd.

    what is the problem????

    thanks in advance.

    1 reply

    Reply 4 years ago on Introduction

    Pin's 15 and 16 control the backlight. Place a 220 ohm resistor on pin 15 and connect it your positive 5volt rail. Pin 16 needs to then be connected to ground


    4 years ago on Introduction

    i did connection according to this steps.but yet i didn't get any o/p in lcd.

    what may be the issue?

    1 reply

    6 years ago on Introduction

    Might change the spelling to ..."Display" as to be correctly found when searching for instructables..


    7 years ago on Introduction

    Thanks !!!.
    I had a LCD lying around gathering dust. Finally got it working after reading your article.
    Nice instructable :)

    1 reply

    Reply 7 years ago on Introduction

    Thanks...for any further help you can contact us:

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