LCD 1602 I2C is one of the most popular display modules used in Arduino projects. It is simple to use, requires only 4 wires, and can display text clearly for various electronics projects such as temperature monitors, counters, sensors, and automation systems.

Easy LCD Display Module for Arduino Projects.

In this tutorial, we will learn how to connect and use the LCD 1602 I2C display with Arduino UNO.

What is LCD 1602 I2C?

The LCD 1602 I2C is a 16x2 character display module with an I2C interface adapter attached at the back. Compared to a normal LCD 1602, the I2C version uses fewer Arduino pins, making wiring much easier and cleaner.

The display can show:

16 characters per row
2 rows of text
Letters, numbers, and symbols

It is suitable for beginners and advanced Arduino users.

LCD 1602 I2C Specifications

LCD 1602 I2C Technical Specifications.

Here are the basic specifications of the LCD module:

Display Type: Character LCD
Display Format: 16x2
Interface: I2C Communication
Operating Voltage: 5V DC
Adjustable Contrast
Only 4 Wires Required

The module usually comes in Blue or Yellow-Green backlight versions.

Components Required

Components Needed for This Project.

For this project, we need:

Arduino UNO R3
LCD 1602 I2C Module
Jumper Wires
Breadboard
USB Cable

Wiring Diagram

LCD 1602 I2C Wiring Connection.

Connect the LCD 1602 I2C to Arduino UNO using the following connections:

LCD I2C → Arduino UNO
VCC → 5V
GND → GND
SDA → A4
SCL → A5

The I2C interface allows communication using only SDA and SCL pins.

Actual Wiring Connection

Actual Hardware Wiring Setup.

After checking the wiring diagram, connect all components using jumper wires.

Make sure:

Wires are connected securely
VCC and GND are not reversed
SDA and SCL are connected correctly

Incorrect wiring may cause the LCD not to display any text.

Check LCD Address Using I2C Scanner

Check LCD I2C Address First.

Before uploading the LCD code, it is important to check the I2C address of the module.

Most LCD 1602 I2C modules use:

0x27
0x3F

Upload the I2C Scanner code to Arduino and open the Serial Monitor to detect the correct address.

If the address is different, change it inside the LCD code.

LCD 1602 I2C Arduino Code

Upload LCD Arduino Code.

After confirming the I2C address, upload the LCD display code using Arduino IDE. You can download HERE.

This example will display scrolling text:
“Welcome To MCE :)”

The code uses:

Wire.h library
LiquidCrystal_I2C library

The text will continuously move across the LCD display.

Adjust LCD Contrast

Adjust LCD Contrast Potentiometer.

If the display is blank or difficult to see, adjust the blue potentiometer at the back of the LCD module.

Rotate:

Clockwise
Counter clockwise

until the characters become visible clearly.

Final Result

Final LCD Display Output.

Once everything is connected correctly and the code is uploaded successfully, the LCD will display:

Welcome To MCE :)

You should now see the scrolling text running smoothly on the LCD display.

📦 Where to Buy

Shopee:

Lazada:

TikTok:

Aliexpress:

Conclusion

Using LCD 1602 I2C with Arduino UNO is simple and beginner-friendly. Since it only requires 4 wires, it helps reduce complicated wiring and saves Arduino pins for other sensors and modules. We hope this tutorial helps you start using LCD 1602 I2C in your own Arduino projects.

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Sunday, May 17, 2026

Beginner Guide to Using LCD 1602 I2C with Arduino UNO