John
I explored this possibility when I replaced paper music with pdfs on an iPad Pro with forScore (one of the best moves I have ever made). If there is a way of using a “regular” foot-pedal to control page turning, I couldn’t find it. As John Starbuck says, a dedicated Page-Turner pedal is the answer.
Incidentally, if it were feasible to use a switch to advance a page, how would you turn back?
Alan