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Old 30-09-2020, 12:56 PM
Greggles (Gregory)
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Greggles is offline
Join Date: Aug 2017
Location: Sydney, Australia
Posts: 55
Hey Bojan,

Ah I didn't know that about the Nano.

200 step motor x 1:26.85 gearbox * 32 microsteps = 171840 steps per rev.
one step = 5550 microseconds. so one revolution = 15.895
one step = 0.08 Arc seconds.

That should be correct.

Originally Posted by bojan View Post
Good job

BTW, Arduino Nano is using low precision crystal (>100ppm) for clock (and every other timing), 10pm would be more appropriate (for AP... but it wouldn't hurt for visual as well).
Of course, this is way better than free running DC motor you had before.
Deviation period of 15 minutes you are mentioning suggests PE (in gearbox probably.. what is the rotational rate of motor/gearbox shaft?).
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