(SOLVED) Fast HW check: (18 digital + 4 analog to I2C ) Arduino Mini Pro + MCP23017 or STM32?
Can mentioned STM be easilly programed as Arduino, manage I2C communication, and still have comfortable 18+4 I/O pins free? And 23+4 I/O free?


it can be programed as Arduino, manage I2C communication, and still have 18+4 I/O pins free or 23+4 I/O free.

it is only knowable to the person programming it whether it can be done easily or comfortably.