Lesson: 25 - How to Interface an I2C LCD Module with Arduino – PCF8574
Lesson: 25 - How to Interface an I2C LCD Module with Arduino – PCF8574
Hello and welcome to Electro Nerds Academy.
In this tutorial, we explain how to interface an I2C LCD module with Arduino using the PCF8574 I2C I/O expander.
A standard 16x2 LCD uses many Arduino pins, but an I2C LCD module reduces this to just two wires (SDA & SCL), along with 5V and GND. This makes your projects cleaner and more efficient.
We begin by comparing a regular 16x2 LCD with an I2C LCD module and explain how the PCF8574 chip converts I2C data into parallel signals for the LCD. You’ll also learn about the onboard contrast potentiometer, backlight jumper, and address selection jumpers (A0, A1, A2).
One of the most common problems is finding the correct I2C address. To solve this, we demonstrate the Arduino I2C Scanner sketch from the Wire library and explain how it works line by line.
We also discuss the difference between Texas Instruments and NXP PCF8574 chips, why their default addresses are usually 0x27 or 0x3F, and how to change the address when using multiple I2C devices.
Finally, we install and use the LiquidCrystal_I2C library by Frank de Brabander, initialize the LCD, control the backlight, and display “Hello World” on the I2C LCD.
What you’ll learn in this video:
✅ What is an I2C LCD and how it works
✅ PCF8574 I2C LCD module explanation
✅ PCF8574 Address selection
✅ Arduino I2C scanner sketch explanation (Wire library)
✅ How to connect I2C LCD to Arduino
✅ Difference between regular LCD and I2C LCD
✅ LiquidCrystal_I2C library installation & usage
✅ Printing text on an I2C LCD display
🔹If want to learn about the working of the 16x2 LCD display and about the Arduino Liquid Crystal library and its functions, check out our previous video for complete guidance.
• Lesson: 23 - How to Interface 16x2 LCD wit...
🔹If you’re new to I2C communication or the Wire library, check out our previous videos for a complete foundation.
• Lesson: 24 - An Introduction to I2C Commun...
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