Welcome to PhantomPilots.com

Sign up for a weekly email of the latest drone news & information

Solution for the 'camera tilting down' syndrome

Discussion in 'Phantom 2 Vision Discussion' started by tsoban, Mar 28, 2014.

  1. tsoban

    Joined:
    Jan 30, 2014
    Messages:
    21
    Likes Received:
    0
    As many of new P2V owners I was struggling a bit with a tilt control and tilting down problem,
    Tilt level settings were nicely covered and explained already, but let me share my observations and solutions for the second issue.
    CameraTilting Down problem was discussed already in this topic:
    http://www.phantompilots.com/viewtopic.php?f=7&t=4792&start=20&hilit=tilt+down
    In my opinion the best explanation of the phenomena was done by Klaus:
    I did several trials and the most probable reason for such behavior is that:
    Once your camera tilt setting is very close to one of the servo limits (doesn't matter - or +) than during the flight phantom tilting angle from gyro is send to camera servo to adjust the camera tilt, and software 'assuming' that servo moved by this angle. In reality if tilt correction is towards camera position limit, servo cannot physically change position anymore but this information is not taken into account by servo controlling algorithm. As the consequence once phantom tilt returns to neutral position, servo algorithm is adjusting angle accordingly, this time servo can move and camera is is tilting down/up (depending no which servo limit + or - was reached) by the angle which was above servo tilt limit before (in worst case it should be around 35°-assuming that camera was in one of the extreme servo positions and phantom was tilted in the same direction by his max allowed angle of 35°.)
    Now how it can be solved,
    1. As already described in this forum you have to change tilt limits to reflect properly max range of the servo, it might differs, something around 900 to -900 should be fine.
    2. step 1 will increase probability that servo movement is in working range but will not solve your problem if you will set your camera close to the limit. For that you have to skip camera 'stabilisation' and set gain to 0, then signal from phantom gyro will not affect the servo control.
    Sorry for a bit long post, but I hope its usefull.
     
  2. jimdenburg

    Joined:
    Jan 21, 2014
    Messages:
    268
    Likes Received:
    3
    Location:
    Mukwonago, WI
    Thanks! I will give that a try (just posted about this issue with mine today!).