PCF8574T IO I2C Expansion Board

The PCF8574T IO Expansion Board is a versatile I²C-based GPIO expander module designed to increase the number of input/output pins available to your microcontroller projects. Built around the PCF8574T integrated circuit, this compact module is perfect for hobbyists, educators, and professionals working on projects where GPIO pins are limited. Its simple I²C interface and low power consumption make it ideal for applications ranging from home automation to robotics and industrial control systems.

Key Features:

• I²C Interface: Simple two-wire communication interface (SDA and SCL) for easy integration with microcontrollers
• Compact Design: Small form factor suitable for breadboard prototyping and space-constrained applications
• Yellow Jumper Configuration: Onboard jumpers for customising I²C address selection, allowing multiple modules on the same bus
• Dual Board Design: Includes main expansion board and breakout board for flexible connection options
• Pin Headers: Pre-soldered or ready-to-solder pin headers for convenient breadboard and project integration
• Power Supply: Operates on 5V logic levels, compatible with most popular microcontroller platforms
• 8-Bit I/O Expansion: Adds 8 additional GPIO pins (P0-P7) through a single I²C connection
• Based on PCF8574T IC: Industry-standard remote 8-bit I/O expander for I²C bus
• Bidirectional I/O Ports: Each of the 8 pins can be independently configured as input or output
• Addressable: Supports up to 8 devices on the same I²C bus through address pin configuration
• Interrupt Output: INT pin provides interrupt capability when input states change
• Low Standby Current: Minimal power consumption in standby mode
• Operating Voltage Range: Typically 2.5V to 6V supply voltage
• I²C Bus Speed: Supports standard (100 kHz) and fast (400 kHz) I²C modes
• SOIC Package: PCF8574T chip in standard SOIC-16 package

Applications

• GPIO Expansion: Ideal for projects requiring additional digital I/O pins beyond what the main microcontroller provides
• LCD Display Control: Commonly used to reduce pin requirements when driving character LCD displays
• Home Automation: Perfect for controlling multiple relays, sensors, or indicators in smart home systems
• Educational Projects: Excellent teaching tool for demonstrating I²C communication and port expansion concepts
• Industrial Control: Suitable for monitoring switches, buttons, or controlling indicators in industrial applications

Why Choose the PCF8574T IO Expansion Board? The PCF8574T IO Expansion Board provides a straightforward and reliable solution for expanding your microcontroller's I/O capabilities without consuming precious GPIO pins. Its industry-standard PCF8574T chip ensures compatibility with a wide range of libraries and platforms, whilst the flexible address configuration allows you to scale your project by connecting multiple modules. Whether you're building a complex control panel or simply need a few extra pins, this board delivers excellent value and performance.