PCF8574T I2C 8-Bit GPIO Expander Module 0x27 for Arduino ESP32 Raspberry Pi

⚙️ PCF8574T I2C I/O Expander Module – 8-Bit GPIO Port Extension for Arduino & Raspberry Pi

Overview

Unlock more digital I/O control with the PCF8574T 8-bit I²C GPIO Expander Module — the smart and efficient way to expand your microcontroller’s capabilities.
Using just two I²C lines (SDA and SCL), this module provides eight additional digital I/O ports, dramatically increasing the number of inputs and outputs available on Arduino, ESP8266, ESP32, STM32, and Raspberry Pi boards.

Cascading support allows you to connect up to eight modules, giving you an incredible 64 controllable I/O channels — all through the same two-wire I²C bus.
Compact, low-power, and easy to integrate, the PCF8574T is ideal for sensor expansion, LCD interfacing, button inputs, and LED control.

⚙️ Key Features

• 🔹 8-bit I/O expansion via I²C / TWI interface

• 🔹 Only two microcontroller pins required (SDA & SCL)

• 🔹 Cascadable design – up to 8 modules on one I²C bus (64 I/O total)

• 🔹 Default I²C address 0x27 – configurable via address jumpers

• 🔹 Bi-directional digital I/O ports for flexible input/output operation

• 🔹 Low-power CMOS design with open-drain outputs

• 🔹 Fully compatible with Arduino Wire.h library and Raspberry Pi smbus

• 🔹 Excellent for driving LCD1602 / LCD2004 displays using minimal pins

📊 Specifications

🧩 Applications

✅ LCD 1602 / LCD 2004 display control
✅ Keypad and button input matrix
✅ LED or relay driving
✅ Sensor data collection
✅ Industrial and IoT expansion boards
✅ Robotics and automation projects

📦 Package Includes

• 1 × PCF8574T 8-bit I²C GPIO Expander Module