Signal Input/Output
Arduino Library for MCP23XXX I2C and SPI GPIO port expanders
Arduino Library for MCP23008, MCP23S08, MCP23017, and MCP23S17 I2C and SPI GPIO port expanders
Maintainer: Adafruit
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.