I2C LCD Module

The I2C LCD Module (PCF8574 Backpack) is a compact and efficient solution to control standard HD44780-compatible LCD displays using only 2 wires. It eliminates the need for multiple GPIO pins, making it ideal for microcontroller boards like ESP32, Arduino, and more.

This module easily attaches to the back of a 16×2 or 20×4 LCD, converting the traditional parallel interface into an I2C communication interface. It also includes a contrast adjustment potentiometer and a backlight control jumper for better display customization.

Perfect for saving pins and simplifying wiring in both beginner and advanced electronics projects.

🔧 Key Features
Based on PCF8574 I/O expander IC
Converts parallel LCD to I2C interface
Uses only 2 pins (SDA, SCL)
Adjustable contrast via onboard potentiometer
Backlight control (jumper or software)
Supports 16×2 and 20×4 LCD displays
Easy to solder directly onto LCD
⚙️ Specifications
Operating Voltage: 5V
I2C Address: Usually 0x27 or 0x3F
Interface: I2C
Compatible LCD: HD44780-based displays
Pins: VCC, GND, SDA, SCL
⚙️ Applications
Arduino / ESP32 projects
IoT displays
DIY electronics
Menu systems and status displays
Sensor data visualization
📦 Package Includes
1 × I2C LCD Module (PCF8574)