Using the on-board relay (on D5) and the thermocouple input (D10, D12, D13, A6 (permanently tied to thermistor amplifier output)), you’ll be left with:
– A4, A5 (I2C) on both card.
– A7 pure analog input on input card.
– D6 (PWM capable) on output card but you have to use the 3 pins jumper selection header to tap this IO.
– D2 (external interrupt capable) on both card.