Roll and tilt on startup

Discussion in '2 Axis Gimbal' started by Chris Fox, Jul 27, 2013.

  1. Chris Fox

    Chris Fox Active Member

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    G'Day All,

    Hoping for some help, I now have my cinestar 8 and 2 axis gimbal. I don't have radians, as the two axis will be sufficient until the movi arrives.

    I have a problem where by the gimbal on start up has a strange behaviour, the gimbal roll and servo leads are plugged directly into the mikrocopter board. However when I power up the machine after about three seconds, the gimbal rolls to full lock to the left and simultaneously tilts down to full lock, it stays there for about a second, and then returns to level, and operates perfectly for the duration of the flight.

    Is their something dumb that I have done, or is this standard behaviour?

    Thanks

    Chris
     
  2. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Chris: Going from memory (it's been a while since I ran the MK FC board to control a gimbal), I think that's a normal power-on, calibration spasm. I seem to recall some folks putting in a servo power switch so they could fire up the FC board and only when it had come up and stabilized and done its "twitch," would they turn on the power to the servos. The problem being that on some cameras the power-on spasm would bang the lens on the ground.

    Other forum members might be able to recall the details better than I can.

    Andy.
     
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  3. Gary Haynes

    Gary Haynes Administrator
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    Standard as I recall. What firmware are you running on the MK FC board?
     
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  4. Chris Fox

    Chris Fox Active Member

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    Thanks Andy and Gary, it had the look of a start up sequence, I was concerned of the d800 being driven into the ground. I will just lift the bird up until the sequence is complete.

    Let the flying/learning continue ;)

    Thanks

    Chris
     
  5. Jason Smoker

    Jason Smoker Active Member

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  6. Gary Haynes

    Gary Haynes Administrator
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    I thought this went away about the time .80 was released. That's why I asked what version Chris is running.
     
  7. Jason Smoker

    Jason Smoker Active Member

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    Yeah no idea i have not used it for a long time either!!
     
  8. Chris Fox

    Chris Fox Active Member

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    Version 1.80b I think.

    thanks
     
  9. Gary Haynes

    Gary Haynes Administrator
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    Update and I think the issue will go away.
     
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  10. Chris Fox

    Chris Fox Active Member

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    Thanks Gary,
    I'll try that and report back.
    Cheers
    Chris
     
  11. Chris Fox

    Chris Fox Active Member

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    Hi All,

    Double checked the firmware version and it was 0.90j ... does this mean it is potentially the parameters that are for the servo limits that may be incorrectly set?

    Sorry, I'm somewhat new to this caper.
     
  12. Jason Smoker

    Jason Smoker Active Member

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    Chris do you have two fc? one for the gimbal one for flight control? I dont know about changing parameters with the flight control board but if you have a second fc for the gimbal I would go ahead and change them following this video
     
  13. Chris Fox

    Chris Fox Active Member

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    Thanks Jason, no I only have the one FC board.
     
  14. Jason Smoker

    Jason Smoker Active Member

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    Yeah I just looked at the mk wiki.

    I would NOT go changing those parameters with just the one FC. down the botton it reads

    This configuration parameter found in the official version of the Flight Software / NaviCtrl not apply.
    Here, no changes can be made. Therefore, all settings are left at 0.
    The User parameters facilitate the handover to the MikroKopter for testing, special or debug versions.

    http://www.mikrokopter.de/ucwiki/en/MK-Parameter/User

    Looks like you may be stuck until you upgrade or change something!!:(
     

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