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The PCF8574 module is used to expand the input/output (I/O) ports over an I2C connection with 8-bit input/outputs. Use with microcontrollers (Arduino) over the I2C serial interface.
The device features an 8-bit bidirectional I/O port (P0–P7), including latched outputs with high current drive capability for directly driving LEDs. Each bidirectional I/O can be used as an input or output without the use of a data-direction control signal.
Three on-board jumpers allow for the selection of up to 8 I2C addresses, allowing up to 8 modules for 64 I/O pins can be connected to the same I2C interface. The module also features convenient input and output headers at each end so that additional modules can simply be daisy-chained without the need for additional wires.
To use this module with standard Arduino boards, download the HCPCF8574 library and example sketches.
Great article with links to Arduino Sketches and Library downloads.
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