PCF8574T I2C I/O Extension Board
The PCF8574T I2C I/O Extension Board is a compact GPIO expansion module designed to increase the number of available digital input/output pins of microcontrollers using only two I2C communication lines. Based on the PCF8574T 8-bit I/O expander IC, this module provides 8 additional digital I/O pins that can be configured for input or output operations. It is widely used for connecting multiple switches, LEDs, relays, LCD displays, sensors, and other digital devices when the controller has limited GPIO pins. Available at Directronics, the PCF8574T I2C I/O Extension Board is ideal for students, hobbyists, makers, educators, and professional engineers working on Arduino, IoT, robotics, and embedded system projects. (Directronics)
Features:
• Based on PCF8574T 8-Bit I/O Expander IC
• Provides 8 Additional Digital I/O Pins (P0–P7)
• Uses I2C Two-Wire Communication Interface
• Reduces GPIO Usage of Microcontrollers
• Configurable I2C Address Using A0, A1, A2 Pins
• Supports Multiple Modules on Same I2C Bus
• Compatible with 3.3V and 5V Logic Systems
• Compact Breakout Board Design
• Low Power Consumption
• Easy Interface with Arduino, ESP32, STM32, and Raspberry Pi
• Suitable for Digital Input and Output Expansion
Why Choose PCF8574T I2C I/O Extension Board?
• Adds extra GPIO pins without using multiple controller pins
• Simplifies wiring in complex electronic projects
• Ideal for controlling multiple digital devices
• Supports easy expansion through I2C communication
• Reduces hardware complexity and saves PCB space
• Perfect for beginners, students, hobbyists, and professionals
Applications:
• I2C LCD Display Interface
• Arduino GPIO Expansion
• ESP32 Pin Expansion Projects
• Relay and LED Control Systems
• Button and Switch Input Expansion
• Robotics Control Systems
• Smart Home Automation
• IoT Device Development
• Embedded System Prototyping
• Industrial Control Applications
Technical Specifications:
• Product Type: I/O Expansion Module
• IC Used: PCF8574T
• Number of I/O Pins: 8 Digital I/O Pins
• Communication Interface: I2C
• Operating Voltage: 2.5V–6V DC
• I2C Address Range: 0x20–0x27 (Configurable)
• Address Selection: A0, A1, A2 Jumpers
• Interface Pins: VCC, GND, SDA, SCL
• Output Type: Quasi-Bidirectional Digital I/O
• Operating Frequency: Up to 100kHz (Typical)
• Compatible Controllers: Arduino, ESP32, STM32, Raspberry Pi
Package Includes:
• 1 × PCF8574T I2C I/O Extension Board
Related Products:
• PCF8591 Analog to Digital / Digital Analog Converter Module
• Arduino Uno
• ESP32 Development Board
• STM32 F103C8T6 System Board
• Raspberry Pi Pico W
• Arduino Sensor Shield V5 Expansion Board
• Relay Modules
• Jumper Wire Bundle (40Pcs)
• Breadboard
Why Buy from Directronics?
Directronics provides quality development boards, communication modules, sensors, electronic components, robotics modules, power management solutions, and IoT products for students, makers, educational institutions, startups, and industry professionals. Explore our complete range of Arduino, ESP32, ESP8266, Raspberry Pi, power modules, motor drivers, programming tools, and embedded development products to bring your ideas to life.
Note:
Product images are for illustration purposes only. Actual module design, PCB layout, pin configuration, and I2C address settings may vary depending on the manufacturing batch. Ensure correct VCC, GND, SDA, and SCL connections while interfacing with microcontrollers. This module is designed for low-speed digital expansion applications and is not suitable for high-frequency signal processing.