I2C LCD Interface Module – PCF8574 Backpack for 16×2 & 20×4 Displays

The I2C LCD Interface Module (PCF8574) is an add-on board that allows you to use 16×2 and 20×4 character LCDs with just two wires—SDA and SCL.
It reduces the number of pins from 16 to only 4 (VCC, GND, SDA, SCL), making it ideal for Arduino and ESP projects where GPIO pins are limited.

The module includes a built-in PCF8574 I/O expander IC, adjustable contrast potentiometer, and backlight control via jumper.
It is fully compatible with Arduino LiquidCrystal_I2C libraries, making setup quick and easy.

✨ Features

• Converts standard 16×2 / 20×4 LCDs to I2C communication

• Only 2 data pins required (SDA & SCL)

• Uses PCF8574 I/O expander IC

• Built-in contrast adjustment potentiometer

• Backlight ON/OFF jumper

• Easy soldering on LCD pins

• Fully compatible with Arduino LiquidCrystal_I2C library

📌 Specifications

📦 Applications

• Arduino/ESP32 LCD displays

• Smart home monitoring displays

• Sensor data display systems

• Robotics user interface

• Compact and clean wiring projects

• Educational electronics