Overview
ThePCF8574 IO Expansion Boardis used as remote 8-bit I/O expander for I2C-bus. Up to 8PCF8574 IO Expansion Boardcan be connected to the I2C-bus, providing up to 64 I/O ports.
ThePCF8574 IO Expansion Boardfeatures I2C pinheader on one side, and I2C connector on the opposite side. Hence, it’s more flexible to connect the board to your development system. The board also supports I2C cascading, allowing the use of multi module connected to the I2C bus at the same time by connecting the pinheader and connector.
Features
PCF8574, I2C interface, 8-bit parallel port
Dimensions

Development resources:demo codes, schematic, datasheets, etc.www.waveshare.com/wiki/PCF8574_IO_Expansion_Board
Package Content

PCF8574 IO Expansion Board 1