PCF8574 I2C I/O Expansion Module

The PCF8574 I2C I/O Expansion Module is a highly efficient and compact solution for expanding the input/output capabilities of microcontrollers using the I2C communication protocol. Designed around the reliable PCF8574 chip, this module allows you to add up to 8 additional digital I/O pins while using only two communication lines (SDA and SCL), making it ideal for projects where GPIO pins are limited.

This module is widely used with popular development platforms such as Arduino, Raspberry Pi, ESP8266, and ESP32. It supports both input and output operations, enabling seamless control of LEDs, relays, buttons, and other digital devices. The PCF8574 module also features configurable I2C addresses, allowing multiple modules to be connected on the same bus for even greater expansion.

With its stable performance and low power consumption, the module is perfect for embedded systems, home automation, and IoT applications. It is also commonly used as an interface adapter for LCD displays (such as 16x2 or 20x4), significantly reducing the number of required connection pins.

The compact PCB design ensures easy integration into prototypes and final products, while clearly labeled pins simplify wiring and setup. Whether you are a beginner or a professional, this I/O expansion module offers a practical and cost-effective way to enhance your project’s functionality.

Features:

• Expands 8 digital I/O pins via I2C interface

• Uses only two communication lines (SDA, SCL)

• Configurable I2C address for multiple modules

• Compatible with Arduino, ESP, and Raspberry Pi

• Supports both input and output operations

• Low power consumption

• Compact and easy-to-use design

• Ideal for LCD interfacing and GPIO expansion

Specifications:

• Chipset: PCF8574

• Communication Protocol: I2C

• I/O Pins: 8 digital pins

• Operating Voltage: 2.5V – 6V

• Address Range: Configurable via jumpers

• Interface Pins: VCC, GND, SDA, SCL

• Output Type: Quasi-bidirectional

• Board Type: Expansion module

Applications:

• Expanding GPIO for microcontrollers

• Interfacing LCD displays via I2C

• Home automation and IoT systems

• Controlling LEDs, relays, and switches

• Embedded system development

• Robotics and DIY electronics projects

• Industrial control applications