Glitchy P3 Advance, Need Advice

[RodPad]

While your Joking around, grab the file from your mobile device, upload to this web sight, copy paste the results URL back here, basic instructions are on the web sight.

DJI Flight Log Viewer

Rod

 

[Joker2415]

While your Joking around, grab the file from your mobile device, upload to this web sight, copy paste the results URL back here, basic instructions are on the web sight.

DJI Flight Log Viewer

Rod

Ohhhh geezzzz!!!!!! after reading your post....I realized why that link wasn't working for me.....I guess I have a lot to learn...haha That link is for the TXT(?) files.

I'll get it together eventually guys!! haha

 

[Fly Dawg]

Just a quick glance at the .dat file. May or may not have time to go through it in detail today, there were large compass errors, in and out of GPS and ATTI. These started around 30 seconds after takeoff and were intermittent through the rest of the flight. Have you done a compass calibration? If not, try one. An IMU calibration may help as well, if you can get that to function in the app. I would be curious to know how the compass calibration goes.

 

[Joker2415]

Just a quick glance at the .dat file. May or may not have time to go through it in detail today, there were large compass errors, in and out of GPS and ATTI. These started around 30 seconds after takeoff and were intermittent through the rest of the flight. Have you done a compass calibration? If not, try one. An IMU calibration may help as well, if you can get that to function in the app. I would be curious to know how the compass calibration goes.

I did a compass calibration before flight. It may be in the log before the one linked. I can't remember if I turned it off after calibration, then back on when I was ready to fly. I always calibrate the compass at or real close to where my home point is going to be before every flight on any of my P3's.

I was able to get the IMU to calibrate. I originally couldn't find it in the app. I was probably looking in the wrong spot. I did end up getting it Calibrated.

 

[RodPad]

Well you can see the .dat file is correct, I guess I'm adding confusion, the .txt file would be from your mobile, it will have information also.
Don't know if @Fly Dawg would want to see it, but you would learn a lot yourself.

Rod

 

[Fly Dawg]

I did a compass calibration before flight.

A quick look back, yes that is in the logs. Also, just a word of caution. There is no need to calibrate the compass unless you are prompted to do so. Doing this too often can cause more issues. Quite honestly, I have done neither a compass calibration nor an IMU calibration in over a year and still holds rock steady in hover, no matter where I fly. On a second note, I never use the VPS either. I and others have found that it causes more landing issues than it helps. Just a few words to throw out.

 

[Joker2415]

Well you can see the .dat file is correct, I guess I'm adding confusion, the .txt file would be from your mobile, it will have information also.
Don't know if @Fly Dawg would want to see it, but you would learn a lot yourself.

Rod

No, your not adding any confusion at all... I'm naturally confused.
I'm working on that now. I want to learn anything I can, this stuff is fun. I'd like to know how to read all of these files and how to work all of these things together.

 

[Joker2415]

A quick look back, yes that is in the logs. Also, just a word of caution. There is no need to calibrate the compass unless you are prompted to do so. Doing this too often can cause more issues. Quite honestly, I have done neither a compass calibration nor an IMU calibration in over a year and still holds rock steady in hover, no matter where I fly. On a second note, I never use the VPS either. I and others have found that it causes more landing issues than it helps. Just a few words to throw out.

Thank you!! I probably saw it in some youtube video and followed their directions. I'm not sure why I started doing the compass calibration at every flight. I thought I saw it in a video, but I may have been confused. haha

I'd rather not calibrate it every time. It takes more time off the battery and flight time. Kind of a pain every time I want to fly...I'm glad you mentioned that and I'll stop doing it before every flight.

 

[Fly Dawg]

Below is a quick plot of the errors. I would venture to guess, as you have described, there is an intermittent issue with the IMU. The shaded green area's are the Compass errors and Yaw Errors, in pink are, GPS Consistency Errors. GPS health is at 3 out of 5. I realize this chart is a bit on the "Busy" side, so my apologies for that.

 

[Joker2415]

Below is a quick plot of the errors. I would venture to guess, as you have described, there is an intermittent issue with the IMU. The shaded green area's are the Compass errors and Yaw Errors, in pink are, GPS Consistency Errors. GPS health is at 3 out of 5. I realize this chart is a bit on the "Busy" side, so my apologies for that.

View attachment 99020

Thank you for spending the time with this. I really appreciate it.

I tried to find the txt log from the device. I can't find it!! The last flight log is from about a week ago and nothing past 5/7/2018...I've tried loading them a few times. Not sure why it didn't log anything past that date. I'm still digging and trying to see if I'm overlooking something.


With what your showing above, could that be caused by a bad sensor? Or is it more likely to be a firmware issue since nothing is consistent , meaning at start up, sometimes it works fine and then others it glitches. What and when things don't work is pretty random so far. I tried it a few times last night...Turned it on and off about 7 or 8 times, everything linked up and looked like it worked ok, then on the 9th time it glitches. Try it again and it glitches, after a few more tries it may work fine again.

Thanks again!!! I've learned a lot of things in the past 2 days!!

 

[Joker2415]

Found it..... Lets see if I can do this right...I'm sure it's the right log, not sure how to post results here...



Download KML | Download CSV | Download Flight Log
Map Size: Small | Medium | Large
Time Flight Mode GPS Altitude Speed Home
Distance Battery Battery
Voltage Cell 1 Cell 2 Cell 3 Cell 4 Cell
Deviation Message
Time
Flight Mode
GPS
Altitude
Speed
Home
Distance
Battery
Battery
Voltage
Cell 1
Cell 2
Cell 3
Cell 4
Cell
Deviation
Message
0m 34.1s P-GPS 13satellites 3.0ft 0mph 47.1ft 86% 15.262V 3.806V 3.826V 3.796V 3.834V 0.038V Compass Error
0m 34.2s P-GPS 13satellites 3.0ft 0mph 47.1ft 86% 15.262V 3.806V 3.826V 3.796V 3.834V 0.038V Compass Error
0m 34.3s P-GPS 13satellites 3.3ft 0mph 47.2ft 86% 15.262V 3.806V 3.826V 3.796V 3.834V 0.038V Compass Error
0m 34.4s P-GPS 13satellites 3.3ft 0mph 47.1ft 86% 15.262V 3.806V 3.826V 3.796V 3.834V 0.038V Compass Error
0m 34.6s P-GPS 12satellites 3.0ft 0mph 47.2ft 86% 15.262V 3.806V 3.826V 3.796V 3.834V 0.038V Compass Error
0m 34.7s P-GPS 12satellites 3.0ft 0.2mph 47.3ft 86% 15.262V 3.806V 3.826V 3.796V 3.834V 0.038V Compass Error
0m 34.8s P-GPS 12satellites 3.0ft 0.5mph 47.4ft 86% 15.262V 3.806V 3.826V 3.796V 3.834V 0.038V Compass Error
0m 34.9s P-GPS 12satellites 3.0ft 0.5mph 47.5ft 86% 15.262V 3.806V 3.826V 3.796V 3.834V 0.038V Compass Error
0m 35.1s P-GPS 11satellites 2.0ft 0.2mph 47.1ft 86% 15.252V 3.8V 3.823V 3.797V 3.832V 0.035V Compass Error
0m 35.2s P-GPS 11satellites 1.3ft 2.7mph 46.7ft 86% 15.252V 3.8V 3.823V 3.797V 3.832V 0.035V Compass Error
0m 35.3s P-GPS 8satellites 1.0ft 2.6mph 47.0ft 86% 15.252V 3.8V 3.823V 3.797V 3.832V 0.035V Compass Error
0m 35.4s P-GPS 8satellites 0.7ft 3.0mph 47.3ft 86% 15.252V 3.8V 3.823V 3.797V 3.832V 0.035V Compass Error
0m 35.6s P-GPS 3satellites 0ft 3.5mph 47.4ft 86% 15.252V 3.8V 3.823V 3.797V 3.832V 0.035V Compass Error
0m 35.7s P-GPS 0satellites 0ft 4.9mph 47.4ft 86% 15.252V 3.8V 3.823V 3.797V 3.832V 0.035V Motor Obstructed; Motor Obstructed
0m 36s P-GPS 0satellites -1.3ft 7.2mph 47.4ft 86% 15.252V 3.8V 3.823V 3.797V 3.832V 0.035V Motor Obstructed
0m 36.1s P-GPS 0satellites -2.0ft 7.9mph 47.4ft 86% 15.252V 3.8V 3.823V 3.797V 3.832V 0.035V Motor Obstructed; Motor Obstructed; Compass Error
0m 36.6s ATTI 0satellites -3.9ft 0mph 47.4ft 86% 15.231V 3.802V 3.816V 3.79V 3.823V 0.033V Motor Obstructed; Compass Error
0m 36.8s ATTI 0satellites -4.3ft 0mph 47.4ft 86% 15.231V 3.802V 3.816V 3.79V 3.823V 0.033V Motor Obstructed; Compass Error
0m 36.9s ATTI 0satellites -4.6ft 0mph 47.4ft 86% 15.231V 3.802V 3.816V 3.79V 3.823V 0.033V Compass Error
0m 37s ATTI 0satellites -4.9ft 0mph 47.4ft 86% 15.231V 3.802V 3.816V 3.79V 3.823V 0.033V Motor Obstructed; Compass Error
0m 37.1s ATTI 0satellites -5.2ft 0mph 47.4ft 86% 15.231V 3.802V 3.816V 3.79V 3.823V 0.033V Compass Error
0m 37.2s ATTI 0satellites -5.6ft 0mph 47.4ft 86% 15.231V 3.802V 3.816V 3.79V 3.823V 0.033V Motor Obstructed; Compass Error
0m 37.3s ATTI 0satellites -5.9ft 0mph 47.4ft 86% 15.231V 3.802V 3.816V 3.79V 3.823V 0.033V Magnetic Filed Interference. Exit P-GPS Mode; Compass Error
0m 37.4s ATTI 0satellites -5.9ft 0mph 47.4ft 86% 15.231V 3.802V 3.816V 3.79V 3.823V 0.033V Compass Error
0m 37.5s ATTI 0satellites -6.2ft 0mph 47.4ft 86% 15.231V 3.802V 3.816V 3.79V 3.823V 0.033V Compass Error
0m 37.7s ATTI 0satellites -6.6ft 0mph 47.4ft 86% 15.231V 3.802V 3.816V 3.79V 3.823V 0.033V Compass Error
0m 37.8s ATTI 0satellites -6.9ft 0mph 47.4ft 85% 14.504V 3.726V 3.593V 3.56V 3.625V 0.166V Compass Error
0m 38s ATTI 0satellites -7.2ft 0mph 47.4ft 85% 14.504V 3.726V 3.593V 3.56V 3.625V 0.166V Compass Error
0m 38.1s ATTI 3satellites -7.5ft 0mph 47.4ft 85% 14.504V 3.726V 3.593V 3.56V 3.625V 0.166V Compass Error
0m 38.2s ATTI 3satellites -7.5ft 0mph 47.4ft 85% 14.504V 3.726V 3.593V 3.56V 3.625V 0.166V Compass Error
0m 38.3s ATTI 3satellites -7.9ft 0mph 47.4ft 85% 14.504V 3.726V 3.593V 3.56V 3.625V 0.166V
0m 38.4s ATTI 3satellites -7.9ft 0mph 47.4ft 85% 14.504V 3.726V 3.593V 3.56V 3.625V 0.166V
0m 38.5s ATTI 3satellites -7.9ft 0mph 47.4ft 85% 14.504V 3.726V 3.593V 3.56V 3.625V 0.166V
0m 38.6s ATTI 3satellites -8.2ft 0mph 47.4ft 85% 14.504V 3.726V 3.593V 3.56V 3.625V 0.166V
0m 38.7s ATTI 3satellites -8.2ft 0mph 47.4ft 85% 14.504V 3.726V 3.593V 3.56V 3.625V 0.166V
0m 38.8s ATTI 3satellites -8.2ft 0mph 47.4ft 85% 14.504V 3.726V 3.593V 3.56V 3.625V 0.166V
0m 39.2s ATTI 0satellites -8.5ft 0mph 47.4ft 85% 14.671V 3.616V 3.642V 3.615V 3.798V 0.183V
0m 39.3s ATTI 0satellites -8.9ft 0mph 47.4ft 85% 14.671V 3.616V 3.642V 3.615V 3.798V 0.183V
0m 39.4s ATTI 0satellites -8.9ft 0mph 47.4ft 85% 14.671V 3.616V 3.642V 3.615V 3.798V 0.183V
0m 39.5s ATTI 0satellites -8.9ft 0mph 47.4ft 85% 14.671V 3.616V 3.642V 3.615V 3.798V 0.183V
0m 39.6s ATTI 0satellites -8.9ft 0mph 47.4ft 85% 14.671V 3.616V 3.642V 3.615V 3.798V 0.183V
0m 39.7s ATTI 0satellites -8.9ft 0mph 47.4ft 85% 14.671V 3.616V 3.642V 3.615V 3.798V 0.183V
0m 39.9s ATTI 0satellites -9.2ft 0mph 47.4ft 85% 14.671V 3.616V 3.642V 3.615V 3.798V 0.183V
0m 40.1s ATTI 3satellites -9.2ft 0mph 47.4ft 85% 14.671V 3.616V 3.642V 3.615V 3.798V 0.183V
0m 40.2s ATTI 3satellites -9.2ft 0mph 47.4ft 85% 14.671V 3.616V 3.642V 3.615V 3.798V 0.183V
0m 40.3s ATTI 0satellites -9.2ft 0mph 47.4ft 85% 15.475V 3.853V 3.875V 3.857V 3.89V 0.037V
0m 40.8s P-GPS 0satellites -9.5ft 0mph 47.4ft 85% 15.475V 3.853V 3.875V 3.857V 3.89V 0.037V
0m 41.4s ATTI 0satellites -9.8ft 1.3mph 47.4ft 85% 15.278V 3.815V 3.828V 3.792V 3.843V 0.051V
0m 41.5s ATTI 3satellites -9.8ft 0mph 47.4ft 85% 15.278V 3.815V 3.828V 3.792V 3.843V 0.051V
0m 42.5s ATTI 3satellites -9.5ft 0mph 47.4ft 85% 15.214V 3.776V 3.806V 3.791V 3.841V 0.065V Aircraft is in Attitude mode, so that it will not hover. Please fly with caution.
0m 43.1s ATTI 3satellites -9.2ft 0mph 47.4ft 85% 15.214V 3.776V 3.806V 3.791V 3.841V 0.065V Motor Obstructed; Motor Obstructed
0m 43.3s ATTI 3satellites -8.9ft 0mph 47.4ft 85% 15.214V 3.776V 3.806V 3.791V 3.841V 0.065V Motor Obstructed
0m 43.4s ATTI 3satellites -8.9ft 0mph 47.4ft 85% 15.214V 3.776V 3.806V 3.791V 3.841V 0.065V Motor Obstructed; Motor Obstructed; Motor Obstructed
0m 44.6s ATTI 3satellites -7.5ft 0mph 47.4ft 85% 14.748V 3.69V 3.723V 3.65V 3.685V 0.073V Downlink Restored (after 0m 1.2s)

 

[RodPad]

OMG, you are a joker!

When you are looking at your results, copy the url the http:,blah, blah stuff, then past that back here.
or upload your .txt file under upload a file or copy it to your dropbox, and one of us will do it.

Rod

 

[RodPad]

Try Mine

DJI Flight Log Viewer - PhantomHelp.com

"www.phantomhelp.com/LogViewer/GY8JDRG4BA18BH0VX6PN/#"

"GY8JDRG4BA18BH0VX6PN/#" this is the blah, blah part

Rod

 

[Fly Dawg]

With what your showing above, could that be caused by a bad sensor? Or is it more likely to be a firmware issue since nothing is consistent , meaning at start up, sometimes it works fine and then others it glitches.

Your device logs basically reveal the same thing. And, my guess would be no, as far as a sensor or firmware goes. Since you said that you were successful in calibrating both the IMU and the Compass, I still suspect an internal electronics issue that is intermittent. Another noticeable fact would be your GPS reception, which could also contribute. Let's see what @BudWalker or @sar104 thinks about this.

 

[Joker2415]

OMG, you are a joker!

When you are looking at your results, copy the url the http:,blah, blah stuff, then past that back here.
or upload your .txt file under upload a file or copy it to your dropbox, and one of us will do it.

Rod

I noticed your log has a compass error too!!

It's all there!! It's just...uhhhh? .....mixed up?

I wasn't sure if the Url would hold the info once I left the page. Not sure how all the works and if the results were held, so I just copied and pasted. But......It didn't copy very well....haha

Ok...Here you go...
Drop box .txt file.
Dropbox - DJIFlightRecord_2018-05-17_[11-50-22].txt

Results from DJI Flight Viewer Log..
DJI Flight Log Viewer - PhantomHelp.com
The blah blah blah part..(just jkg around with you by adding this part. )
"www.phantomhelp.com/LogViewer/JKV6FD3SEWOWE3NJZSCB/"

Drop Box .Dat. file..
Dropbox - FLY089.DAT

The next thread I'll know what to do..haha well? on this part at least. ... I basically knew nothing about this when I started the thread. I'm slowly getting it! haha

Thanks to the replies to the thread I appreciate the help! I can read all about this stuff in the forums but some of it takes someone to walk me through, for me to understand.

 

[Joker2415]

Your device logs basically reveal the same thing. And, my guess would be no, as far as a sensor or firmware goes. Since you said that you were successful in calibrating both the IMU and the Compass, I still suspect an internal electronics issue that is intermittent. Another noticeable fact would be your GPS reception, which could also contribute. Let's see what @BudWalker or @sar104 thinks about this.

I'll open it back up tonight and check all connections again...Just in case I missed a bad wire or something when I put it back together. I didn't look real close the first time since I wasn't sure what to even look for or if it still had the issues...

What program did you use to get the graph? That's cool how it was graphed out like that.

Thanks again!

 

[RodPad]

"I noticed your log has a compass error too!!"
Good call..
If I recall very short flight and it was black top and trees, may have landed or carried it back to the Yukon.

Rod

 

[RodPad]

"What program did you use to get the graph? That's cool how it was graphed out like that."

Take a close look at this post: from @BudWalker
Advanced - Glitchy P3 Advance, Need Advice

Rod

 

[BudWalker]

Sorry for the delay, I've been a bit busy with other stuff lately.

Looking at FLY089.DAT I'm not so sure there is a HW problem. If I hadn't seen all the discourse about swapping parts etc I would speculate that the P3 was flying close to the concrete driveway, and then close to a parked car. This is what lead to the Yaw/magYaw separation at 29 secs. The loss of satellites at 32 secs didn't help much.

Rather than attempting to sort all this I suggest another test flight. Launch from a cleaner site, not the driveway. Before launch check to make sure the red heading indicator on the Go App map is consistent with the actual orientation. Ascend to about 10 feet and hover for 2 or 3 minutes. If there is an IMU problem it'll become apparent.

 

[sar104]

Sorry for the delay, I've been a bit busy with other stuff lately.

Looking at FLY089.DAT I'm not so sure there is a HW problem. If I hadn't seen all the discourse about swapping parts etc I would speculate that the P3 was flying close to the concrete driveway, and then close to a parked car. This is what lead to the Yaw/magYaw separation at 29 secs. The loss of satellites at 32 secs didn't help much.

Rather than attempting to sort all this I suggest another test flight. Launch from a cleaner site, not the driveway. Before launch check to make sure the red heading indicator on the Go App map is consistent with the actual orientation. Ascend to about 10 feet and hover for 2 or 3 minutes. If there is an IMU problem it'll become apparent.

View attachment 99040
View attachment 99041

That's my initial conclusion too - all the indications in that flight point to the usual yaw discrepancy due to magnetic distortion as the underlying issue.