Signal Input/Output
A library for the MCP23017, MCP23S17, MCP23018 and MCP23S18 port expanders.
It includes commands for single pins and complete ports. Interrupts on pin changes and interrupts on deviation to the DEFVAL register are supported.
Maintainer: Wolfgang Ewald
This library is compatible with all architectures so you should be able to use it on all the Arduino boards.
To use this library, open the Library Manager in the Arduino IDE and install it from there.