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
yesterday
DIY Robocars via Twitter
RT @NVIDIADRIVE: Season Beta has arrived! Check out the first race of the @roborace season, livestreaming from Anglesey Circuit Sept. 24-26…
Tuesday
DIY Robocars via Twitter
RT @IndyAChallenge: Here is the ROS-based small-scale vehicle platform showing the ROS Visualization (Rviz) screen with multiple ROS nodes…
Tuesday
DIY Robocars via Twitter
RT @IndyAChallenge: Here is Black & Gold Autonomous Racing's simulated racecar running a lap @IMS and showing the team's code overtaking ot…
Tuesday
DIY Robocars via Twitter
Tuesday
DIY Robocars via Twitter
RT @donkey_car: New Maintainers! Donkey Car 4.0 and more! Here is our September Newsletter! https://donkeycar.substack.com/p/september-donkey-newsletter?r=2ji2t&utm_campaign=post&utm_medium=web&utm_source=copy
Tuesday
DIY Robocars via Twitter
RT @chr1sa: Kinda cool that we just hit 2,500 members of our Bay Area self-driving car racing league. More than 10k globally. Fast, cheap…
Tuesday
DIY Robocars via Twitter
RT @chr1sa: Our next @DIYRobocars virtual AI car race is next Saturday. Compete from home using the @donkey_car simulator -- no physical ca…
Sunday
DIY Robocars via Twitter
RT @RoboticMasters: Students from @Sydney_Uni working hard on improvements and changes to @donkey_car simulator. @diyrobocars @adafruit…
Sunday
DIY Robocars via Twitter
Practice virtual race this Saturday; the real thing will be on Oct 3 https://www.meetup.com/DIYRobocars/
Sep 23
DIY Robocars via Twitter
Sep 23
Derrick Davies liked lisa TDrones's profile
Sep 23
DIY Robocars via Twitter
Sep 21
DIY Robocars via Twitter
RT @SahikaGenc: AWS DeepRacer & Hot Wheels Track https://youtu.be/4H0Ei07RdR4 via @YouTube
Sep 14
DIY Robocars via Twitter
Sep 8
DIY Robocars via Twitter
RT @davsca1: We are releasing the code of our Fisher Information Field, the first dedicated map for perception-aware planning that is >10x…
Sep 8
More…