$20 wireless electronics April 11, 2015 02:44AM |
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Quote
dc42
So I think the comfortable minimum is 4 step pins, 1 DIR pin, 2 Enable pins, 2 thermistor inputs, 2 heater outputs, 2 endstop inputs, and one Z probe input. That's 14 pins. Add one if you want a controllable cooling fan. Add one for a delta printer, or subtract one for a non-delta if you are using a Z probe that can also be used for X homing , as the Ormerod does. So you still have around 4 spare pins - just enough to interface to an SD card.