I have not tested it in "the field" yet
But PHD will register it as a telescope mount using the LX200 under both Windows/ASCOM and Linux/INDI, and i think I've got the main commands for guiding in place.
Currently its configured as a replacement for a EQ3's GS-280 handset, using 8 of the arduino's GPIO's to toggle the coils via transistor arrays, rather than a specialised stepper driver
TODO's: timed movement commands, testing, dew control would be nice.
https://github.com/graphworlok/Equat...C_LX200_Driver
Due to an odd duty cycle on the EQ3's GS-280 handset, i used the following sketch to approximate/improve the timing:
https://github.com/graphworlok/Pulse...Second_Counter