Pixhawk replacement and tuning: motor lag

Posted by Jimmy Oliver on February 28, 2015 at 11:58pm

After a Pixhawk failure and pretty mean crash of the Iris+, I have installed 3DR replacements of the PXHK and GPS units. After extensive tuning, I have it almost where I need it (sans propellers or flying) After calibrating the ESC's, I find that in regular start up my standard (that comes with the unit) RC radio is leaving the motors hanging and/or lagging behind in commands. I have to flick the stick at the bottom to return to idle. The calibration of the radio is a beyond the 1100/1900 by 100 or so in each direction.

Any thoughts?

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Tags: esc's, frsky, iris+, pixhawk
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Replies

  • Developer
    Bill Bonney March 1, 2015 at 9:20am
    Ps: you can also install the default parameters for the iris+ as well
    • Jimmy Oliver > Bill Bonney March 1, 2015 at 10:39am

      Ok. I did install the Iris params. 
      If I write the params again, will that wipe the compass calibration? I had a great sphere man! 

    • Jimmy Oliver > Jimmy Oliver March 1, 2015 at 12:58pm

      Flew perfect accept that I have it in "simple" mode! 

      Thx again for the reply.

    • Developer
      Bill Bonney > Jimmy Oliver March 1, 2015 at 10:13pm
      I always apply param files using the compare feature, so I only tick the ones I want. But in the case of the Iris Param file it only contains the values it can preset. You still need to calibrate rc, accel, compass
  • Developer
    Bill Bonney March 1, 2015 at 9:20am
    When armed, the motors will spin (you can disable this). Setting to zero throttle is probably triggering a disarm.

    An in any case, it's can be hard to predict the motor behaviour when 'bench testing'. Especially in modes other than stabilize.

    Following the calibration procedures and you will good to fly
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