Platform agnostic driver for the PCF8574, PCF8574A and PCF8575 I/O expanders written in Rust using embedded-hal
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Rust PCF857x I/O Expanders Driver Docs

This is a platform agnostic Rust driver for the PCF8574, PCF8574A and PCF8575 I/O expanders, based on the embedded-hal traits.

This driver allows you to:

  • Set all the outputs to 0 or 1 at once.
  • Read selected inputs.
  • Set all the outputs repeatedly looping through an array.
  • Read selected inputs repeatedly filling up an array.
  • Split the device into individual output pins.

The devices

The devices consist of 8 or 16 quasi-bidirectional ports, I²C-bus interface, three hardware address inputs and interrupt output. The quasi-bidirectional port can be independently assigned as an input to monitor interrupt status or keypads, or as an output to activate indicator devices such as LEDs.

The active LOW open-drain interrupt output (INT) can be connected to the interrupt logic of the microcontroller and is activated when any input state differs from its corresponding input port register state.



Licensed under either of


Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.