Thank you for the update
.
As soon as I am finished with my 3D printer (I still may need that additional Arduino board if case of some catastrophic event), I will try this on my LXD75 (witch came with simple controller only, I bought it specially for Cairns solar eclipse).
BTW..
Couple of years ago I was playing with this solution for my permanently mounted EQ-6:
http://projects.gbdt.com.au/eq6-1/
And, currently I am using SoundStepper (and I am very happy with it) (
http://soundstepper.sourceforge.net/)
Both solutions "talk" LX200 language