Button to start/stop while loop.

Thanks for looking.

I copied this part of the code into the while loop and it's working now. I guess I can live with having to hold the button for 2 seconds to stop it.

currentButton = debounce(lastButton);
  if (lastButton == LOW && currentButton == HIGH)
  {
    motOn = !motOn;  //motOn is boolean variable for switch on/off
  }
  lastButton = currentButton;
  digitalWrite(SLEEP, motOn);   //set SLEEP pin to value of motOn variable