I think you want to go minimalistic on the printing pheripheals:
- temperature reading, that can work with max6675 idd. Or can also work with a thermistor + a pullup resistor and a 10uF capacitor (you can build these "in air" or on top of a 0.100' pin). Your choice.
- low side fet switches, you can mount them on a pice of aluminium, drain goes to the load (low side), sink to the psu gnd, and gate to the gpio pin. The load has V+ on high side.
- endstops, this is a short connection from gpio to the ground, and it uses the gpio pin internal pullup. If you are in dire need of pins, you can use only one pin for all endstops, connected in series, and have the carriage release each endstop after it bumps in it, so its in continuity after used. You can aslo resort at using no endstops at all, thats possible too. So imo figure out the rest and count pins, leave endstops for the end.
Thats about it :)
- temperature reading, that can work with max6675 idd. Or can also work with a thermistor + a pullup resistor and a 10uF capacitor (you can build these "in air" or on top of a 0.100' pin). Your choice.
- low side fet switches, you can mount them on a pice of aluminium, drain goes to the load (low side), sink to the psu gnd, and gate to the gpio pin. The load has V+ on high side.
- endstops, this is a short connection from gpio to the ground, and it uses the gpio pin internal pullup. If you are in dire need of pins, you can use only one pin for all endstops, connected in series, and have the carriage release each endstop after it bumps in it, so its in continuity after used. You can aslo resort at using no endstops at all, thats possible too. So imo figure out the rest and count pins, leave endstops for the end.
Thats about it :)