Replies to This Discussion

Permalink Reply by Norman Sanchez on July 27, 2012 at 7:39am

Hi all, I have a problem with 2.7.
to 1/3 of tx throttle begins to accelerate progressively to maximum, it just does not touch the accelerator,
is like having a command on or something that will only accelerate,
with no code has happened to me only with the 2.7.
everything else is perfect GPS signal level orientation etc.
perfectly balanced, with default pid, only on test bench.
APM 1.4 850 10x4.5 prop motor sc 10 amp sound frame lv EZ4 XAircraft 650v4

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3D RoboticsPermalink Reply by Chris Anderson on July 27, 2012 at 7:41am

Norman, did you recalibrate your RC input as part of the MP setup process?

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Permalink Reply by Norman Sanchez on July 27, 2012 at 8:26am

yes, I calibrated it. deleted the eprom. I changed to 2.6 and has no problem with only 2.7 to 1/3 throttle very gently begin to accelerate until it stops.

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Permalink Reply by Norman Sanchez on July 27, 2012 at 9:11am

after checking with 2.6 operation, again by 2.7, by the mission planner, erase eprom, reset, calibration of all parameters, radio level, mode, etc, default parameters, accelerated and 1/3 begins to accelerate only gently to the fullest. happens with 2.7, I reload 2.6 with Arduino and all good. charge of 2.7 with the arduino this time, perfect load reset and delete configuration parameters again. all good. same thing happens to 1/3 of the stick begins to accelerate smoothly till the maximum.

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Permalink Reply by Norman Sanchez on July 27, 2012 at 11:56am

Everything perfect again by 2.6. 2.7 and again: When i give throttle (Around 1/3) and let go my hand, it Slowly Increases the throttle to full. all calibrated as always happens, something new with the throttle. There is a thread on that show something similar.

http://diydrones.com/forum/topics/quad-needs-a-doctor?commentId=705...

the problem only manifests with 2.7, I  tested from the 2.4 to 2.6 yesterday and today and only the 2.7 gives me the throttle problem. throttle (Around 1/3) and let go my hand, it Slowly Increases the throttle to full.

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Permalink Reply by Norman Sanchez on July 27, 2012 at 10:41pm

Solved my problem, after several loads and deletes decided to use the parameters of 2.6 in 2.7 and is working properly. are not exactly that the default parameters of 2.7 gives me the problem.

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DeveloperPermalink Reply by Randy on July 28, 2012 at 5:39am

Norman,

    I think I know what the issue is...I think the IMAX value of the Yaw Rate term is too high (it's 50 when it should probably be around 8 or 10).  So what happens is that while you're sitting on the ground, your yaw drifts a little (which is normal) so the yaw controller's I term builds up increasing the power to two motors (and reducing to the other two) in an attempt to cause a rotation but it's unsuccessful because it's on the ground.

     I think on earlier versions of the code, we had the Rate Yaw's I Term as zero so it didn't matter about the IMAX but now it does.

     Can you reduce the Rate Yaw's IMAX and see if your problem goes away?

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Permalink Reply by Norman Sanchez on July 28, 2012 at 6:02am

Thanks for your reply, I will try comparing parameters and informs you, I think it's possible.

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Permalink Reply by Stephen Gienow on July 27, 2012 at 7:42am

Hi.  Is it safe to use "land" as a flight mode?  Like when I invoke it, will my copter auto land?  If someone would explain the land flight mode it would help me out a lot, the wiki is kind of lacking in this area.

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Permalink Reply by Jake Simon on July 27, 2012 at 11:26am

If you switch to Land the quad will try to land at its current location. Most people don't use this for heavy hexas, octos, etc.

I suggest testing it on grass and with the quad less than 4ft off the ground. The quad should land, but the motors will not stop spinning (this is in the code). You will have to switch back to a manual mode to stop the motors.

Also, my quad has a tendency to flip over after it touches down because the motors keep spinning.

-Jake

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DeveloperPermalink Reply by Marco Robustini on July 27, 2012 at 11:32am

@Stephen: use autoapproach function! :-)

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Permalink Reply by steve F11music.com on July 27, 2012 at 10:14am

Great work everyone! I'm using stock 3DR/APM2, sonar, xbee and 3300-5000mAh 4S and carbon reinforced 10" props with stock motors. Yesterday I had the courage to take it to 500M and drop the throttle to zero. After hearing it whistling in free fall, I gave a little throttle and like magic it righted itself :) Now to try the flip switch :)

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