How to use I2C in STM32F103C8T6? STM32 I2C Tutorial? STM32 I2C Tutorial
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
How to use I2C Pins in Raspberry Pi Pico | I2C Scanner Code