Hi everyone, this is my first post on DIY Drones although I have been scouring this forum for years for useful info. I don't even know if I'm posting in the right forum section or not, but hopefully I am. I have always been able to figure out any problems I had using the information that is already out there.... that is, until now.

I have recently built a ZMR250 with a Pixhawk Mini and DJI Snail propulsion system. I know it's a weird combination, but it's for research purposes. I have set it all up using QGroundControl because I find it much easier and more straight forward to use than Mission Planner. Plus the professor I built it for has been using QGroundControl to experiment with autonomous algorithms on other airframes, and is familiar with it. I cant seem to get this aircraft tuned correctly though! I tried it with the airframe types "Generic Quad X" and "Generic 250 Racer", but with both, it oscillates like crazy. Even with the slider to adjust Pitch/Roll sensitivity all the way down, it still oscillates to the point of being almost completely un-flyable. I know all the sensors are calibrated correctly, and have a feeling it's because of the DJI propulsion system I am using. I have used many other DJI propulsion systems with Pixhawks in the past without any issues though, they have always worked extremely well... just not this one.

Does anyone know if there is a way to adjust the PID's manually in the parameters tab?

Does anyone know if one of the other airframe selections in QGroundControl will allow me to turn down the PID's even lower than the two airframe's I have already tried?

Is using Mission Planner my only option at this point?

Kind of off topic, but what difference do the airframe choices in QGroundControl make, just different baseline tunes?

Any help would be much appreciated! Thanks! 

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • Hi Ian,

    I realise this is too late, but did you ever manage to solve the issue ?

    -Abhishek

  • There's a ton of info on RCgroups as to this specific issue: https://www.rcgroups.com/forums/showthread.php?2749559-DJI-Snail-mi...

    Most of this discussion concerns FPV/race oriented flight controllers but the problem everyone's dealing with - wobble of death - is the same as what you describe.

    RC Groups
    RC Groups - the most active Radio Control model community: electric and fuel rc airplanes,rc helis,rc boats and rc cars. Features discussion forums,…
  • I've built a few quads using DJI Snail propulsion system and I've had tons of problems with the proprietary ESC's - I think it's great hardware but the firmware is bigtime problematic. DJI promised a firmware update back in early 2017 to address the oscillation issues but nothing's happened on that end. My advice to you is to purchase some 3rd party escs and use them with the Snail motors. 

  • Hi Ian
    I suffered from the same thing did you solve your problem & how?
  • Damn, no replies?
This reply was deleted.

Activity

DIY Robocars via Twitter
May 15
DIY Robocars via Twitter
May 14
DIY Robocars via Twitter
May 13
DIY Robocars via Twitter
RT @f1tenth: Say hi to our newest #F1TENTH creation for @ieee_ras_icra next week in Philly. It’s going to be huge! 😎 🔥 @AutowareFdn @PennEn…
May 13
DIY Robocars via Twitter
May 11
DIY Robocars via Twitter
May 8
DIY Robocars via Twitter
RT @SmallpixelCar: Noticed my car zigzagged in last run. It turned out to be the grass stuck in the wheel and made the odometry less accura…
May 8
DIY Robocars via Twitter
RT @SmallpixelCar: Test my car. RTK GPS worked great. Thanks @emlid for their support. https://t.co/EkQ6qmjmWR
May 8
DIY Drones via Twitter
RT @chr1sa: @kane That's @diydrones circa 2009. Still have a box of those Canon cameras that we used to strap into planes, just like this.…
May 3
DIY Robocars via Twitter
RT @chr1sa: Our next @diyrobocars race is going to be outside at a real RC racetrack in Fremont on May 28. Fully autonomous racing, head-to…
Apr 30
DIY Robocars via Twitter
RT @f1tenth: Our Spring 2022 F1TENTH course @PennEngineers is coming to an end with a head-to-head race as a big finale. So proud of our st…
Apr 26
DIY Robocars via Twitter
RT @DanielChiaJH: I wrote a thing! Throughout the development of my @diyrobocars car I've been using @foxglovedev Studio to visualize and d…
Apr 23
DIY Robocars via Twitter
RT @SmallpixelCar: My new car for high speed. Low body, everything ( @NVIDIAEmbedded Jetson Xavier NX, @emlid RTK GPS, IMC) under the deck…
Apr 23
DIY Robocars via Twitter
Apr 21
DIY Robocars via Twitter
RT @f1tenth: F1TENTH Race training setup @PennEngineers for our upcoming ICRA2022 @ieee_ras_icra competition. @OpenRoboticsOrg @IndyAChalle…
Apr 21
DIY Robocars via Twitter
RT @fatcatFABLAB: Proud to be hosting a restarted DIY Robocars NYC Meetup April 26. Come by if you want to talk about and race self-driving…
Apr 17
More…