### Project 3 My LCD display

**1.Introduction**

LCDs are very common and useful in our life. It’s widely applied on phone screens and TV screens. In this lesson, we will introduce you a 1602 LCD module to help you understand how it works.

**2.Hardware required**

- EASY plug controller Board x1
- USB cable x1
- EASY plug cable x1
- EASY plug 1602 I2C Module x1

First, let’s take a look at this 1602 I2C Module.

![](media/image-20251126141459157.png)

EASY plug 1602 I2C module is a 16 character by 2 line LCD display with blue background and white backlight. This LCD is ready-to-use because it is compatible with the Arduino Liquid Crystal Library. The original 1602 LCD needs 7 IO ports to be up and running, this easy plug design makes the wire connection easier than ever. Below are its specifications:

- I2C Address: 0x27
- Back lit (Blue with white char color)
- Supply voltage: 5V
- Adjustable contrast
- Size: 98*36mm
- Weight: 4g

**3.Connection Diagram**

Now, connect the LCD module to the IIC port of the controller board using the EASY plug cable.

![](media/image-20251126141551667.png)

**4.Sample Code**

Connect the board to your PC using the USB cable; copy below code into Arduino IDE, and click upload to upload it to your board.

```c
//YWROBOT
//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include <Wire.h>    // Place file “Wire.h” under the directory “library” of Arduino
#include <LiquidCrystal_I2C.h>  // Place file “LiquidCrystal_I2C.h” under the directory “library” of Arduino
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 
  lcd.init();
  // Print a message to the LCD.
  lcd.backlight();
  lcd.setCursor(2,0);
  lcd.print("Hello, world!");
  lcd.setCursor(2,1);
  lcd.print("Hello, keyes!");
}

void loop()
{
}
```

**5.Result**

After power is on, the first line of LCD will display “Hello, world!”, and the second line will display “Hello, keyes!”.

![](media/image-20251126141850269.png)