-I only have analog pins left. It's my understanding this doesn't really matter since you can just use them as digital outputs, right?
-My more important question: Using the arduino pin to pull it low seems to be no problem, but what when I want the write protection to be on again? Can I just toggle the pin to a digital high?
Since it is already connected to the 5V power via a resistor, won't that be a problem (having 2 different 5V simultaneously connected).
Or do I just set it to an input pin (and ignore the input)
and if so: a digital or analog input, with internal pullup resistor or not?