Description
Description
The PCF8574T I/O Expansion Board is a compact and easy-to-use I2C I/O expander module designed to increase the number of available digital I/O pins on your microcontroller. Instead of using multiple GPIO pins, the module communicates through the I2C bus, requiring only two communication lines.
This module provides 8 additional I/O ports and can be used with popular development platforms such as Arduino, Raspberry Pi, ESP8266, and STM32. It is particularly useful for projects where the available GPIO pins are limited.
The board can also be used as an I2C LCD adapter for standard 16×2 and 20×4 character LCD displays. A built-in potentiometer provides convenient contrast adjustment, while the jumper allows you to enable or disable the LCD backlight.
With selectable I2C addressing through solder jumpers, up to 8 modules can be connected to a single I2C bus, making it a practical solution for expanding I/O in electronics and embedded projects.
Key Features
- PCF8574T I2C I/O expansion module
- Provides 8 additional digital I/O ports
- Uses a simple 2-wire I2C interface
- Supports standard 16×2 and 20×4 LCD displays
- LCD backlight control via jumper
- Adjustable LCD contrast using onboard potentiometer
- Up to 8 modules can be used on one I2C bus
- I2C address selectable through solder jumpers
- Compatible with Arduino, Raspberry Pi, ESP8266, STM32, and other controllers
- Compact design for easy installation and prototyping
- RoHS compliant daughter board
Specifications
| Specification | Details |
|---|---|
| IC | PCF8574T |
| Interface | I2C / IIC |
| I/O Expansion | 8 additional I/O ports |
| Power Supply | 5V |
| LCD Compatibility | 16×2 and 20×4 character LCD |
| LCD Control | Serial I2C |
| Backlight Control | Jumper selectable |
| Contrast Adjustment | Onboard potentiometer |
| I2C Address | Selectable via solder jumpers |
| Modules per I2C Bus | Up to 8 |
| Module Size | 41.6 × 19.2 mm |
| Compliance | RoHS compliant |
Applications
The PCF8574 I/O Expansion Board is suitable for:
- Arduino projects
- Raspberry Pi projects
- ESP8266 and STM32 development
- I2C LCD displays
- Sensor interfaces
- LED control and matrices
- Switch and button arrays
- Relay control
- Embedded electronics projects
- GPIO expansion applications
Package Includes:
1 x PCF8574 I2C Module
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