ITEM NAME:PCF8574 IO Expansion Board I/O Expander I2C-Bus Evaluation Development Module Description: Standard interface that can be expanded in a variety of development boards I2C Serial port to 8-bit parallel port , support expand into 8×8 = 64 at most PCF8574 IO expansion chip with I2C interface, 8-bit parallel port output Applicable to a variety of platforms including / AVR / ARM With this module, you can use only 2 ports of your or Raspberry Pi board to control up to 8 digital I/O ports. Material: Plastic Size: Approx. 55x15x1mm Package Includes: 1x PCF8574 Expansion Board SKU: DMO0011845051000682.PCF8574 IO expansion chip with I2C interface, 8-bit parallel port output. 1x PCF8574 Expansion Board. I2C Serial port to 8-bit parallel port, support expand into 8×8 = 64 at most. People always bought together with.