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Different home position from angles <180 and angles >180

2024-12-04
2024-12-05
  • Julio Hornos

    Julio Hornos - 2024-12-04

    Dear all,

    Now that all seems to work I am testing the home button from different angles.
    I have notice that the home position is different coming from angles <180 and from angles >180, this is due because for angles <180 the rotator move in right direction and for angles >180 in left direction to arriving faster to the correct angle,
    Coming home from the angles <180 stop in left side of the sensor and coming from angles >180 stop in right side of the sensor, so the home position is not always the same. For doing that the only posibility is to move to angles from 0 to 360 always in the same direction (right) and that way the home position will be always on the left side of the sensor.
    I attach a picture to show that.
    Any solution or sugestion?

    Regards,

     
  • brownrb

    brownrb - 2024-12-05

    Hi Julio

    Coming home from the angles <180 stop in left side of the sensor and coming from angles >180 stop in right side of the sensor, so the home position is not always the same. For doing that the only posibility is to move to angles from 0 to 360 always in the same direction (right) and that way the home position will be always on the left side of the sensor.>

    I dont think anyone seriously supports the 0-360 rotator any more. The major problem with that is the cable wrapping. Software is easy.

    About discrepancies in Home Position when the direction of move is from either side. Absolutely. Yes I have known this for some time. The intended action was to do the following
    1. Save the HOME request
    2. Move to Absolute angle 1
    3. go HOME

    ensuring that a move to Home would always be from the side. The code was in an earlier release (a lot earlier) but moved out when the timer that controls moves was added into the code.

    I will get back to this soon. In the meantime, ASCOM does not have a HOME command, that is only supported in Windows application. So the workaround is
    If the rotator angle is > 180, then move to absolute position 1, then HOME
    If the rotator angle is < 180, go HOME

    Regards
    Robert

     
  • Julio Hornos

    Julio Hornos - 2024-12-05

    Thanks Robert
    I will use with Nina, so This won't affect in my case, I suppose

     

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