Hi Robert. I'm sorry if I've made a pest of myself recently between this and the filter wheel issues.
I was wondering if it was possible to reverse the movement of the rotator? Unfortunately NINA does not offer the ability to reverse rotator movement in the acquisition software itself, so it is left up to the ASCOM driver and firmware to support reversing. Its not a simple matter of doing the math and specifying 270º instead of 90º either, since NINA uses platesolving to determine the angle and make adjustments.
I believe that in a pinch, I should be able to swap pin2 and pin3 assignments on the UNL2003 driver / 28BYJ-48, but if it were possible to do that via software or the ASCOM driver, it would be much easier.
Thanks for any advice,
-Tony
Last edit: Anthony Sturchio 2022-01-03
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I dont think that would be as easy as it sounds.
If you change the wires on the 28BYJ-49 motor, you also have to change the step cycle that drives the 4 input pins of the ULN2003 so that the stepper drives correctly. And that is more difficult than it sounds.
With a NEMA, easy, no need to change the step cycle, just swap the wires,
I did at one state write the sequence to half step the 28bjy, that was in an early release of myfp2esp code, because the motor was to be interrupt driven, and virtually all libraries for the 28byj out there use wait/delays to sequence the pins (and delays one cannot have when one uses interrupts to step the motor).
But it is not something that I would do again.
There is no harm done if you try out your ideas, they may work.
regards
Robert
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hi Robert. I'm sorry if I've made a pest of myself recently between this and the filter wheel issues.
I was wondering if it was possible to reverse the movement of the rotator? Unfortunately NINA does not offer the ability to reverse rotator movement in the acquisition software itself, so it is left up to the ASCOM driver and firmware to support reversing. Its not a simple matter of doing the math and specifying 270º instead of 90º either, since NINA uses platesolving to determine the angle and make adjustments.
I believe that in a pinch, I should be able to swap pin2 and pin3 assignments on the UNL2003 driver / 28BYJ-48, but if it were possible to do that via software or the ASCOM driver, it would be much easier.
Thanks for any advice,
-Tony
Last edit: Anthony Sturchio 2022-01-03
I dont think that would be as easy as it sounds.
If you change the wires on the 28BYJ-49 motor, you also have to change the step cycle that drives the 4 input pins of the ULN2003 so that the stepper drives correctly. And that is more difficult than it sounds.
With a NEMA, easy, no need to change the step cycle, just swap the wires,
I did at one state write the sequence to half step the 28bjy, that was in an early release of myfp2esp code, because the motor was to be interrupt driven, and virtually all libraries for the 28byj out there use wait/delays to sequence the pins (and delays one cannot have when one uses interrupts to step the motor).
But it is not something that I would do again.
There is no harm done if you try out your ideas, they may work.
regards
Robert