Ks0138 keyestudio EASY plug I2C 2004 LCD

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Keyestudio EASY plug 2004 LCD Module


An LCD, or liquid crystal display, is a simple screen that can display commands, bits of information, or readings from your sensor - all depending on how you program your board.
This module is a 20 character by 4 line LCD display with Blue background and White backlight.
The original 2004 LCD needs 7 IO ports to be up and running, ours is built with Arduino IIC/I2C interface, saving you 5 IO ports.
This LCD is ready-to-use because it is compatible with the Arduino Liquid Crystal Library. It comes with EASY Plug connector, you can use one line for simple connection.
Note: this module should be used together with EASY plug control board.


  • Interface: I2C
  • I2C address: 0x27
  • White text on blue background
  • 20 characters wide, 4 rows
  • Operating voltage: +5V
  • Contrast control: through potentiometer
  • Compatible with Arduino LiquidCrystal Library

Technical Details

  • Dimensions: 114mm*60mm*22mm
  • Weight: 77.7g

Connect It Up

Connect the EASY Plug 2004 LCD to control board using an RJ11 cable. Then connect the control board to your PC with a USB cable.

Upload the Code

Copy and paste below code to Arduino IDE and upload.
Code to Note:
Before compile the code, do remember to put the libraries needed inside the libraries folder of Arduino IDE directory. Or else, it will fail to verify.
Download all the libraries: https://drive.google.com/open?id=1KkjnoR3Y_eRM-LMHEIrMzQabLabbSQpU

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

LiquidCrystal_I2C lcd(0x27,20,4);  // 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.print("Hello, world!");
  lcd.print("Arduino LCD IIC 2004");
  lcd.print("Power By Ec-yuan!");
void loop()

What You Should See

Initially, you should see the words “hello, word!” and “keyestudio!” pop up on your LCD.
Remember you can adjust the contrast using the potentiometer on the module back if you can’t make out the words clearly.


Download the PDF:

Download the libraries:

Download the Code:

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