GitHub - GillesC/MCP23017-RPI-Lib: Library to access the MCP23017 including interrupts
IO Expansion
32 Channel Digital Expansion HAT for Raspberry Pi - RobotShop
How to use MCP23017 with Raspberry Pi — Steemit
How To Use A MCP23017 I2C Port Expander With The Raspberry Pi - Part 1 - Raspberry Pi Spy
Using the MCP23017 port expander with WiringPi2 to give you 16 new GPIO ports – part 3 – RasPi.TV
Amazon.com: CQRobot Ocean: MCP23017 IO Expansion Board Compatible with Raspberry Pi/Micro:bit/Arduino/STM32 Motherboard. I2C Interface, Expands 16 I/O Pins, Up to 8 Expansion Boards Can be Used Simultaneously. : Electronics
Raspberry Pi I2C 4×4 matrix keypad with MCP23017 and Python | Mikronauts.com