im just finishing off one of these, haven't tested it on the scope yet but it looks like its going to work well
https://sourceforge.net/projects/ard...controllerpro/
or a more basic version that costs next to nothing
https://sourceforge.net/projects/arduinoascomfocuser/
i think the one you linked just gives you a basic app that acts like the hand control (in/out) which is fine to manually focus with but the arduino adds automation and temperature compensation