Quote:
Originally Posted by Screech
Yes it's a Picaxe microcontroller.
32 whole steps stepper motor with built-in 64:1 reduction gearbox.
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Coil "A" is energized for around ~13 milliseconds, then coil "B" for ~13milliseconds, then coil "c" for ~13milliseconds, then coil "D" for ~13 milliseconds, then repeat. Always repeat.
1 RPM rotation accuracy error = perfect at room temperature.
1 RPM accuracy error = -0.1second per hour at 4 degrees Celsius.
Tested electronically to a 100th of a second for 1 hour.
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That's excellent. For 3 or 4 minute exposures, next to nothing. Pausing the mount for 10 seconds between images can improve the quality of the final stacked image, as well, providing you keep the target in the view finder.