I was able to get my first stable consistent DOT pattern!
Nice!
Unfortunately I am not a whiz at tuning in the scope. I also have no way of running this motor at low speed. The lines are shaky for reasons - who knows why.
Referring to your 'scope picture in the earlier post:
It looks like you have the 'scope triggering on Channel 1 and the Trigger Level (indicated by the "1>" at bottom left edge) is right at the bottom of the waveform - Move the trigger level up to the middle of the waveform and try using Normal vs. Auto triggering.
Unfortunately the project is old and the link to their source coded has decayed.
This may be the source for the original project you linked:
Yours,
TonyWilk