Drift in ACC Mode

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SoundMTB
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Drift in ACC Mode

Post by SoundMTB »

Dear All,

I have a QUADX and it flies good with 1.7 Software.
Now I have updated the Copter with 1.8 and in ACC Mode it is nearly impossible to trim the Copter after some stick movemends it starts to drift right more and more.
If i land, stop motors, calibrate ACC and resart it works until I touch the Sticks on the RC.
I reduce the LEVEL P Value to 5.01 it's a little bit better now but the effect is still there.

Who can help me?

regards
Oliver

copterrichie
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Re: Drift in ACC Mode

Post by copterrichie »

which ACC do you have?

cardboard
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Re: Drift in ACC Mode

Post by cardboard »

I'm glad I'm not the only having this problem.
Check out this thread maybe there's a bug in the code or we have a slimier hardware setup that has an issue.
http://www.multiwii.com/forum/viewtopic.php?f=8&t=671

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SoundMTB
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Re: Drift in ACC Mode

Post by SoundMTB »

Hi

I've the BMA020 ACC and Arduino Pro Mini 5V

Oliver

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SoundMTB
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Re: Drift in ACC Mode

Post by SoundMTB »

Hi again

I've installed the MAG HMC5883 and BARO BMP085. With Soft 1.7 the ACC was working well together with MAG and BARO.
Same Hardware with Soft 1.8 and the System have a drift like the description in my first Post.
I've raday a second Copter with the same config (the Motor arms are 2cm shorter) but it have the same drift error.
I'm 99% sure it isn't the Mechanik, or Props. I't looks Like an Software foult like some Akkumulation of Parameters in ACC Mode.

regards
Oliver

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Hamburger
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Re: Drift in ACC Mode

Post by Hamburger »

which gyro?
I have one copter with similar problems: wmp,bma020, no other sensors.
edit: it is with wmp, not adxl345 - too many copters, get all confused, sorry
Last edited by Hamburger on Wed Sep 07, 2011 11:25 am, edited 1 time in total.

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SoundMTB
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Re: Drift in ACC Mode

Post by SoundMTB »

Hi

I'm using in all my Copters the Wii Motion Plus Sensor

regards
Oliver

copterrichie
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Re: Drift in ACC Mode

Post by copterrichie »

SoundMTB wrote:Hi

I've the BMA020 ACC and Arduino Pro Mini 5V

Oliver


I made a video of the BMA020 that I have, it would drift as much as 15 points. I replaced it and everything is fine now.

I documented it here: http://www.multiwii.com/forum/viewtopic.php?f=8&t=592

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shikra
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Re: Drift in ACC Mode

Post by shikra »

Try autolevel I =0 as per other thread...

Also shield acc from heat / sunlight / temp changes. That is definitely an impact on mione


Also make sure heavy power cables to not run straight next to acc.
I try for 1 inch separation. I did some testing and there seemed to be an impact on flying. More twitches and drift. I never proved it 100% though. Sometimes when you look for things you see them when not really there.

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SoundMTB
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Re: Drift in ACC Mode

Post by SoundMTB »

Hi

I've chect your idear.
please see.
viewtopic.php?f=8&t=671

Oliver

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