The PCF8574 I/O expansion board is used as an 8-bit remote I/O expansion for the I2C bus. Up to 8 PCF8574 I/O expansion boards can be connected to the I2C bus, providing up to 64 I/O ports.
The PCF8574 IO expansion board features an I2C header on one side and an I2C connector on the other side. Therefore, it is more flexible to connect the board to your development system. The board also supports I2C cascading, allowing multiple modules connected to the I2C bus to be used at the same time by connecting the pinheader and connector.
