Adding buttons to control stepper motor speed.

Projects Programming
9

You might try something like this, no button needed:

if(analog > 900)
  speed = fwdFast;
else if(analog > 775)
  speed = fwdMedium;
else if(analog > 651)
  speed = fwdSlow;
else if analog > 527)
  speed = fwdCreep: // 2 steps per second
else if(analog > 490)
  speed = 0;
else if(analog > 366)
  speed = revCreep;
else if(analog > 245)
 speed = revSlow;
else if(analog > 122)
  speed = revMedium;
else
  speed = revFast;