DJI log analysis

[marcosvc]

Hi, I am Marcos Valim from Brazil. I usually help many friends when they have problems with their drones, I even have a WhatsApp group in my region with 300 drone users. I use my experience in this help, and for better details I check their flight logs. I use the Phantom Help and Airdata UAV apps. I see in this forum some colleagues using graphs analysis with IMU graphs, motor power, etc. I would like to know what other apps you use to do this analysis of DJI logs.

 

[slup]

The Phantom Help and Airdata web presented log content show very little of the total log data... in order to access all you can download their .csv version of the log & open it with either excel & there create graphs from the column data or you can open the .csv file in the free CsvView computer program which generate graph views from the data you chose.

CsvView can also directly read .txt logs generated from the Fly app version earlier than 1.2.2, the GO4 app, many of the mobile device DAT logs from the older drone models... & the onboard DAT logs from the Mavic Pro 1 and older drone models.

.txt logs generated from Fly app v1.2.2 & newer is encrypted & can only be open by CsvView if first uploaded to Phantom Help or Airdata, & then downloading their .csv file of the log.

 

[marcosvc]

The Phantom Help and Airdata web presented log content show very little of the total log data... in order to access all you can download their .csv version of the log & open it with either excel & there create graphs from the column data or you can open the .csv file in the free CsvView computer program which generate graph views from the data you chose.

CsvView can also directly read .txt logs generated from the Fly app version earlier than 1.2.2, the GO4 app, many of the mobile device DAT logs from the older drone models... & the onboard DAT logs from the Mavic Pro 1 and older drone models.

.txt logs generated from Fly app v1.2.2 & newer is encrypted & can only be open by CsvView if first uploaded to Phantom Help or Airdata, & then downloading their .csv file of the log.

Thank you for the help.

 

[maybe_pilot]

Hey guys. I would like to request an expert opinion on my crash. This is the URL from Phantom Help where I plugged my txt file:

DJI Flight Log Viewer | Phantom Help

Upload and view flight logs from your DJI drones

www.phantomhelp.com

In a few words. Drone model: DJI Air 3. I took off near my house (about 2 meters away). Upon the take off, the drone started slow but steady movement towards the house wall. Usually it takes off and hovers steady without much swaying left/right/back/forward at all. Not that time though.

Seeing this happening for, I tried to engage but it was too late and I it seemed like the drone didn't even respond to me pulling it back.

I want to believe that my drone went nuts and misbehaved and DJI should fix it for me. But I'd appreciate if you could provide your expert opinion on this crash and tell me how you see it. Clearly I'm an idiot that I took off that close the the house. Lesson learned hard way. This will never happen again. What I am worried about though is the drones behavior upon take off. Why the heck did it just start flying on its own? It wasn't windy or anything outside. Did want to fly away maybe but that wall ended up being on the way... Anyhow, I thank you in advance for your time and effort for an honest and unbiased opinion. I'm gonna fix this puppy anyways with or without DJI and it'll fly again.

Also, attaching a CSV and a flight log here if needed.

Thanks

 

[Meta4]

I want to believe that my drone went nuts and misbehaved and DJI should fix it for me. But I'd appreciate if you could provide your expert opinion on this crash and tell me how you see it.
Clearly I'm an idiot that I took off that close the the house. Lesson learned hard way. This will never happen again. What I am worried about though is the drones behavior upon take off. Why the heck did it just start flying on its own? It wasn't windy or anything outside. Did want to fly away maybe but that wall ended up being on the way...

The data shows your problems beginning when the drone reached a height of approx 6 ft.
Then the compass data rapidly changes without any corresponding joystick input.
The pitch and roll data suddenly changes to extreme values, much higher than you would see in normal flight, again without any corresponding joystick input.
And the drone rapidly accelerates to higher than normal speed.

All of this is indicative of a yaw error which would have been caused by powering up the drone close to a source of magnetic interference which deflected the compass.
The incorrect compass data was used as the initial direction value for the gyro sensor in the IMU.
When the drone launched and climbed away from the magnetic influence, the compass values returned to normal, but the gyro data can't.
How that results in the erattic behaviour is complicated, but it usually results in the drone speeding away in faster than normal, uncontrollable flight, which usually results in a hard crash a short time after.

Can you confirm the direction the drone was facing at launch?
Was it pointed towards the southeast - towards the house and parallel with the road?
What was the surface you placed the drone on to power up?