Hi,

I've recently put together a quad with DJI FlameWheel 440 frame, ESCs and motors and APM 2.0

I have few problems:

1. in Stabilize mode it's extremely difficult to hold altitude: when I slightly increase the throttle to avoid crashing the copter continues to ascend and even small change causes it to descend and it bounces up and down. I tried changing the controls but they seem to have no effect so if anyone you guide me which ones to pay special attention to, that would be great. (note: in loiter mode it's much more stable).

2. the copter also seems to have problems with holding position despite solid blue GPS light. I managed to put it to stable hover in stabilize mode and then switched it to loiter mode then without touching the sticks observed what's it doing - the copter was drifting to random positions within 15-meters radius - I would expect better from GPS (note: it was open space and no wind at all).

Any help would be very much appreciated

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

Join diydrones

Email me when people reply –

Replies

  • I broke 12 props so far with the same problem.
    4x 800kv + 4x 1147 props
    i used to have wobbling issue which i solved recalibrating
    but now i have the same excat problem as you....

    despite the big props it take off at 65%... then it's a rollecoaster of the throttle stick...until it crashes because i lose control...

  • Hi i too am having problems with throttle in stabilize mode. The quad is all over the place jumping up and down. The more time the quad stays in the air the more throttle up and down inputs i have to use to keep the quad in the air. I have to change it to loiter or it will crash. 

    I need help please as i can't resolve this problem, would like to get this out of the way so i can move to pids.

    Thank you

  • MR60
    Hello,
    Tom, for your first issue, i experience the same problem where throttle control is extremely binary and not progressive at all as it should be to allow easy control. I have a post on this here:
    http://diydrones.com/group/arducopterusergroup/forum/topics/problem...

    I hope the community here will belp us find an improvement or workaround because it is the whole point to fly our arducopters easily!
    Hugues
  • I just built a 540mm frame,  ntm 26-28a motors 30amp esc.  I get a perfect gps lock and can not fly in stabalized simple mode.. 

  • Hi Tom,

    Get a GPS lock while your USB is hooked up, if your experience is similar to mine, you can watch your Quad in the mission planner flight data section wander around and make periodic excursions even with 9 satellites showing.

    I believe that GPS inaccuracy is at least partially responsible for this problem. 

    As for the first problem I would like clarification that the Alt Hld Thrust / Throttle PID is actually used during non automatic mode operation: EG Stabilize and if this is true why is it prefixed with Alt_Hld.

  • Thank you all for the discussion above. For shure many of my kind of pilots, pedestrians all over the world, listen and learn.

    lars

     

  • Guys, I would not recommend using throttle curves for taming the throttle.

    It will complicate the PID tuning.  What I recommend is to lower the throttle P value, say by small increments, say 0.10, to reduce the sensitivity.

    Also, there should be no notching on the throttle stick.  It should be smooth, otherwise it's very hard to get good throttle control. If your transmitter stick has notches, either file them off or put a piece of electrical tape over the notches to smooth it out, yet keep the tension on the throttle.

  • T3

    Glad to hear it worked Michael!  I switched to a Spektrum controller, so I have six channels and a throttle curve.  The quad flies like a dream now!

  • I presume being an Aussie you are flying with a Mode 1 radio.

    I tried this initially but found that the throttle on the same stick as the roll was far too difficult to handle.

    Switched the radio to Mode 2 and have had a much better experience.

  • Many people use the throttle curve adjustment on their Tx, so that in the mid range they are able to flatten out the "ramp" to make it less touchy.  If you have not calibrated your ESC's that may help also.  Make sure on your TX settings that you are using the full range of the throttle BEFORE you calibrate the ESC and do the Radio Cal in the Mission Planner.

This reply was deleted.

Activity

DIY Robocars via Twitter
RT @TinkerGen_: "The Tinkergen MARK ($199) is my new favorite starter robocar. It’s got everything — computer vision, deep learning, sensor…
Monday
DIY Robocars via Twitter
Monday
DIY Robocars via Twitter
RT @roboton_io: Join our FREE Sumo Competition 🤖🏆 👉 https://roboton.io/ranking/vsc2020 #sumo #robot #edtech #competition #games4ed https://t.co/WOx…
Nov 16
DIY Drones via Twitter
First impressions of Tinkergen MARK robocar https://ift.tt/36IeZHc
Nov 16
DIY Robocars via Twitter
Our review of the @TinkerGen_ MARK robocar, which is the best on the market right now https://diyrobocars.com/2020/11/15/first-impressions-of-tinkergen-mark-robocar/ https://t.co/ENIlU5SfZ2
Nov 15
DIY Robocars via Twitter
RT @Ingmar_Stapel: I have now explained the OpenBot project in great detail on my blog with 12 articles step by step. I hope you enjoy read…
Nov 15
DIY Robocars via Twitter
RT @DAVGtech: This is a must attend. Click the link, follow link to read the story, sign up. #chaos2020 #digitalconnection #digitalworld ht…
Nov 15
DIY Robocars via Twitter
RT @a1k0n: Got a new chassis for outdoor races (hobbyking Quantum Vandal) but I totally didn't expect that it might cause problems for my g…
Nov 11
DIY Drones via Twitter
First impressions of the Intel OpenBot https://ift.tt/36qkVV4
Nov 10
DIY Robocars via Twitter
Nov 9
DIY Robocars via Twitter
Excellent use of cardboard instead of 3D printing! https://twitter.com/Ingmar_Stapel/status/1324960595318333441
Nov 7
DIY Robocars via Twitter
RT @chr1sa: We've got a record 50 teams competing in this month's @DIYRobocars @donkey_car virtual AI car race. Starting today at 10:00am…
Nov 7
DIY Robocars via Twitter
Nov 6
DIY Robocars via Twitter
RT @a1k0n: Car's view, using a fisheye camera. The ceiling light tracking algorithm gave me some ideas to improve ConeSLAM, and having grou…
Nov 5
DIY Robocars via Twitter
RT @a1k0n: To get ground truth I measured the rug, found the pixel coordinates of its corners, calibrated my phone camera with my standard…
Nov 5
DIY Robocars via Twitter
RT @a1k0n: @DIYRobocars is back in December, but outside. Time to reinvestigate ConeSLAM! I rigged up a quick and dirty ground-truth captur…
Nov 5
More…