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Trying to understand output...

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by harwoodr, May 13, 2019.

  1. harwoodr

    harwoodr New Member Gold Contributor

    Joined:
    Dec 9, 2013
    Messages:
    28
    Balance:
    340Coins
    Ratings:
    +11 / 0 / -0
    My Motion Simulator:
    Motion platform, 6DOF
    I'm trying to get data out of No Limits 2 Roller Coaster simulator... all seems good, but I have questions about the actual output...

    In axis assignments, I've set up the following (all in the DOF 1 column):

    axis1a - surge 100%
    axis2a - sway 100%
    axis3a - heave 100%
    axis4a - pitch 100%
    axis5a - roll 100%
    axis6a - yaw 100%

    I'm set for 8 bits (decimal) output - and while standing still at the start of the roller coaster I'm seeing:

    125,127,165,131,127,242

    a) So, 127 is what I would expect to see in the first three values... where is 165 in heave coming from?

    b) for pitch, roll, yaw - those are specifically the orientation angles that I'm seeing, correct?
  2. harwoodr

    harwoodr New Member Gold Contributor

    Joined:
    Dec 9, 2013
    Messages:
    28
    Balance:
    340Coins
    Ratings:
    +11 / 0 / -0
    My Motion Simulator:
    Motion platform, 6DOF
    Shite, is this where someone tells me that gravity is included in the 165 for heave?
  3. ghidossi

    ghidossi Member

    Joined:
    Apr 14, 2019
    Messages:
    35
    Balance:
    - 95Coins
    Ratings:
    +3 / 0 / -0
    My Motion Simulator:
    3DOF, Arduino
    hi, output is the command so it not depends of gravity except if you PID function is not setup correctly
  4. harwoodr

    harwoodr New Member Gold Contributor

    Joined:
    Dec 9, 2013
    Messages:
    28
    Balance:
    340Coins
    Ratings:
    +11 / 0 / -0
    My Motion Simulator:
    Motion platform, 6DOF
    I'm using raw data (extracting the x/y/z/etc. forces) - it's not being directly fed into a PID... so, 127 is the "neutral" and, based on the values in tuning, the extra is the force of gravity (while not moving).

    I had asked, and then figured it out... :)