RC India

RC Models => Multirotors => Topic started by: kiran rc on October 12, 2014, 04:29:27 PM



Title: Quadcopter suggestion needed
Post by: kiran rc on October 12, 2014, 04:29:27 PM
Hello I built a new quadcopter but broke two of its arms. This was my first quadcopter maiden flight ever. It is very sensitive. Any ways to make it less sensitive?
Thank you


Title: Re: Quadcopter suggestion needed
Post by: sooraj.palakkad on October 12, 2014, 05:14:32 PM
You have to adjust PID values, which is your Flight Controller?


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on October 12, 2014, 05:25:51 PM
I think it was already set. Using kk2.1 board.


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on October 12, 2014, 05:29:29 PM
Can you please explain me about PID values?


Title: Re: Quadcopter suggestion needed
Post by: ashimda on October 12, 2014, 06:36:28 PM
What size quadcopter are we talking about? Whats the weight? PID values have to be adjusted accordingly. to reduce sensitivity try using some expo on the transmitter.
for an explanation of PID values try this: http://blog.oscarliang.net/quadcopter-pid-explained-tuning/ (http://blog.oscarliang.net/quadcopter-pid-explained-tuning/)


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on October 12, 2014, 08:04:47 PM
Thanks.Its450 size.Weight is 800grams.


Title: Re: Quadcopter suggestion needed
Post by: sooraj.palakkad on October 12, 2014, 10:49:09 PM
I mean you have to adjust values according to its sensitivity,
Anyway what is your setup? Motors ? and Dia?


Title: Re: Quadcopter suggestion needed
Post by: sooraj.palakkad on October 12, 2014, 10:50:43 PM
Try OscarLiang's forum, He has some best tutorials, I studied a lot from there.


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on October 13, 2014, 12:03:23 AM
Motor dia 28mm
Speed 1200kv
30amp esc
11.1V lipo


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on October 23, 2014, 08:13:57 AM
I rebuilt the quadcopter after the crash.Now its much more strong.Still not able to balance it. It tilts towards right, left... I mean its not stable while taking off. I tried subtrimming too.


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on October 23, 2014, 08:19:55 AM
PID values which I set for now.

P Gain: 50
P Limit: 100
I Gain: 25
I Limit: 20


Title: Re: Quadcopter suggestion needed
Post by: sooraj.palakkad on October 23, 2014, 10:22:43 AM
Which is your Flight control board?


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on October 23, 2014, 11:11:44 AM
I have posted it earlier. :)Its kk2.1 board.


Title: Re: Quadcopter suggestion needed
Post by: sooraj.palakkad on October 23, 2014, 11:19:13 AM
Refer this link,
http://oddcopter.com/2013/01/06/easy-diy-quadcopter-build-part-4-tuning/ (http://oddcopter.com/2013/01/06/easy-diy-quadcopter-build-part-4-tuning/)


Title: Re: Quadcopter suggestion needed
Post by: sooraj.palakkad on October 23, 2014, 11:20:10 AM
One more thing, Hve u done throttle calibration with ESC? Which are ur ESCs?


Title: Re: Quadcopter suggestion needed
Post by: Rcproduct on October 23, 2014, 11:44:02 AM
Just Reset your KK2 Board with Factory setting.
And Re-calibrate your Escs.

Maybe it can solve your Problem.



Title: Re: Quadcopter suggestion needed
Post by: kiran rc on October 23, 2014, 06:31:55 PM
@sooraj, I have already calibrated.
@Rcproduct, that would be my final option.


Title: Re: Quadcopter suggestion needed
Post by: v2 eagle on October 23, 2014, 10:42:26 PM
What actually is your quad doing, can you post a video or something,
 normally a quad wont stay still in air unless it has GPS. there will be some small corrections needed in most of quads for various reasons. PID plays a major part in stability but the geometry of the frame is also important. are all your prop shafts perpendicular to the arms? self stabilization setting can make your quad go crazy and make you to chase the quad to stay in one place.

Ashok.P


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on October 24, 2014, 12:21:59 PM
Sir I will try to post a video. For now I am posting the pics of it.The problem is that when I try to take it of the ground, it either tilts left, right, front or back.I mean its not stable. So unable to take if off.


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on October 24, 2014, 12:29:24 PM
There is the quad.


Title: Re: Quadcopter suggestion needed
Post by: sooraj.palakkad on October 25, 2014, 12:03:55 AM
That is a beautiful build, Sad It's not in the air. :(
What is your center plates , Glass fiber PCB?
Is this X or + mode ? If it is X , Do you programmed your KK board to X mode? Is your Flight control board in correct orientation?


Title: Re: Quadcopter suggestion needed
Post by: akhilzid on October 25, 2014, 12:43:59 AM
i think direction of the kk board is not correct/motor connections are swapped.

if yours is X Quad

as per your motor arrangements the black arrow is your Front/Back
as per kk board the red arrow shows Front/Back

so turn your board 90 degree  left or right

also refer second image


Title: Re: Quadcopter suggestion needed
Post by: SideWinder on October 25, 2014, 12:57:36 PM
Nice catch Akhil.
I would also suggest Kiran not to the place the FC inside the foam box, instead cut 4 /5 symmetrical pieces out of that foam and stick it on the edges of the FC. Then place the FC on frame.  


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on November 05, 2014, 08:21:41 PM
Thanks Akhil sir.I will try doing that.
@SideWinder, I have cut the bottom part of the foam box.I have surrounded the foam around fc.


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on November 05, 2014, 08:25:31 PM
Sooraj, yes it has pcb center plates.It is X quad.


Title: Re: Quadcopter suggestion needed
Post by: miginstruments on November 06, 2014, 12:11:40 PM
apart from all these also check ur transmitter trims. if ur quad is drifting then there might also be a problem with the trims.


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on November 08, 2014, 08:08:17 PM
Ok, identified.Its a faulty Fc.


Title: Re: Quadcopter suggestion needed
Post by: akhilzid on November 08, 2014, 08:17:23 PM
Ok, identified.Its a faulty Fc.

are you sure with that?


Title: Re: Quadcopter suggestion needed
Post by: sooraj.palakkad on November 08, 2014, 08:33:58 PM
Ok, identified.Its a faulty Fc.

Don't quickly, take that decision, there is so many problems with latest KK firmwares,
I was recently trying my luck with 2 KK5.5 flight control boards , Each time I upload the same firmware, the response is not same, me too even thought the board is damaged, but identified it is firmware problem, After uploading same firmware many times, Now I am searching for older version firmware.


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on November 08, 2014, 09:51:42 PM
I have not updated the firmware.I still have stock firmware on it.On the screen the gyro bubble is not working. Anyways to repair it?I even tried fractory reset.


Title: Re: Quadcopter suggestion needed
Post by: akhilzid on November 08, 2014, 11:13:07 PM
try heating each gyros using hot air gun(you may need to remove display)


Title: Re: Quadcopter suggestion needed
Post by: sooraj.palakkad on November 08, 2014, 11:36:57 PM
I think KK LCD boards have no seperate 3 axis gyros, There is SMD gyro+acc on it.

Is your stock f/w really for X mode?
Which is your stock f/w ?
(don't know if you already answered this questions.)


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on December 08, 2014, 09:12:28 PM
Ok finally flies after replacing fc board.When I try to land, it comes down very quickly and unstable. Is this due to esc?.they are not simonk.I think the rate is too slow.Should I change esc?


Title: Re: Quadcopter suggestion needed
Post by: sooraj.palakkad on December 08, 2014, 10:20:28 PM
How much do you lower your throttle while landing.
Is this first time flying a quad ?


Title: Re: Quadcopter suggestion needed
Post by: kiran rc on December 08, 2014, 11:52:04 PM
No, not first time.Flew many mini and micro quads.Also practised in simulator.I go very gentle on throttle.I feel that the quad reacts late to my input.Pi values are quite good and low.At certain altitude while landing, It makes more noise and comes down quickly.


Title: Re: Quadcopter suggestion needed
Post by: sooraj.palakkad on December 09, 2014, 12:27:46 AM
Just try with default PI values by resetting the board.
And then tune PI again.
do you have expo or throttle curve set in Tx ?