Arduino Example Code: Print 'Hello, world!' on I2C 16x2 LCD Display Module

Print "Hello, world!" to the LCD and turn on the backlight. Users can learn how to initialize the LCD and display basic text.

Hardware Preparation

[I2C LCD1602 Module](https://www.dfrobot.com/product-135.html](https://www.dfrobot.com/product-135.html)
Arduino UNO
Arduino Leonardo

Software Preparation

Development Tools: Arduino IDE 1.0 or higher; Library: LiquidCrystal_I2C v1.1; Download Link: Sample code and library

Wiring Diagram

Connection Diagram

Arduino UNO: connect SDA to Analog pin 5 and SCL to Analog pin 4 on your Arduino.
Arduino Leonardo: connect SDA to digital pin 2 and SCL to digital pin 3 on your Arduino.

Other Preparation Work

Set the I2C address of the LCD module according to the Address Setting table (default is 0x27).
Install the LiquidCrystal_I2C library in the Arduino IDE.

Sample Code

Download Sample code and library

//DFRobot.com
//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display

void setup()
{
  lcd.init();                      // initialize the lcd

  // Print a message to the LCD.
  lcd.backlight();
  lcd.print("Hello, world!");
}

void loop()
{
}

Result

The LCD displays "Hello, world!" and the backlight is on.

Additional Information

Refer to the project DYP-ME007 Ultrasound range finder - display distance on a I2C 2x16 LCD for more usage examples.

Example Code for Arduino-Display Hello World