Overview: Solve Your I/O Pin Shortage

Are you running out of digital input/output pins on your Arduino or other microcontrollers? This powerful PCF8575 I2C I/O Expander Module is your simple solution!

It allows you to expand your project's digital I/O capacity by an incredible 16 pins, all while using only two I/O pins on your main board for the I2C control interface. Perfect for projects that need to control multiple relays, buzzers, or LEDs.

Key Features & Benefits

• Massive I/O Expansion: Instantly add 16 near-bi-directional digital input/output pins to your project.
• Simple Control: Uses the universally common I2C / IIC / SMBus interface, requiring only SDA and SCL pins.
• Interrupt Output: Features a dedicated open-drain interrupt output pin (INT), enabling your microcontroller to react instantly to any change in the input status without constant polling.
• Level Compatibility: Includes an on-board 3.3V level converter circuit for flexible use across various systems. By default (pad VCC-VDD open), the PCF8575 operates at 3.3V. If you solder the VCC-VDD pad, the level will match your VCC supply (e.g., 5V).
• Individual Addressing: All 16 pins are individually addressable and can be configured as either an input or an output pin.
• Easy Setup: Compatible with the standard PCF8575 Arduino library.

Specifications