Raspberry Pi I2C 4×4 matrix keypad with MCP23017 and Python | Mikronauts.com
Raspberry Pi I2C 4×4 matrix keypad with MCP23017 and Python | Mikronauts.com
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