[bojan]

Richard,

Do not overdesign if you want only visual and no GoTo, 200s/rev and 16 /usteps should be OK as it will give you ~3arcsec resolution (see attached excel spreadsheet.... please note, ustepping is treated the same as "gearbox"). Even crystal accuracy is not the issue.

Of course, 3arcsec is not enough for AP, it will result in star trails, but for visual it should be enough - you will see your object move in small steps ~5 times every second.

If this annoys you, you can increase ustepping, ~ 32 or 64 should be OK


So, if you want to only track, but not necessaarily GoTo etc, uStepper module is OK.
And of course. you can also consider possibly cheaper options - Maybe Digispark board and Pololu module?



My spreadsheet will give you the required pulse rate, and all you have to do is programming of the uStepper_S board.



However, if you want GoTo and use only uStepper_S, as far as programming is concerned, you will be on your own.

If you still want uStepper_S, and if you are happy with not using onboard proceesors (and Arduino MEGA or Teensy running OnSTEP) then you are also OK.