qcplab
lvl.1
Flight distance : 764423 ft
Ukraine
Offline
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Hi,
as DJI Tech support suggested, I refreshed the firmware from the PC DJI Assistant 2 software, and then calibrated IMU, and then compass.
Everything went flawlessly.
Then i calibrated IMU on flat level desk bla bla, it worked without reporting error. Maybe to mention, i calibrated IMU from tablet since PC, when calibration is initiated wants to calibrate visual sensors and i have no capacity for that yet. On tablet, on the other hand, it provides me selective sensor calibration. So I skipped visual sensors calibration.
Then i went out, far from iron bla bla bla and calibrated compass.
I took her off. Simple vertical wrooooooommmm upwards and watched the instrumental status. It said 25m, then i looked up, it seemed higher (how can one tell), then i look at tablet and it was 35 meters. Not touching joysticks!
Then it started to descend. But reaaaaly rapidly as if i was commanding a fast descend. I let for few seconds but then used the command UP to stop it since i was afraid it would crash!
Thanks God it didnt disobey the commands and i stopped the descend. So.....i brought her down to only few meters above ground and observed what sensors say and what the reality was. Sonic sensor is definitely way more accurate, maybe even absolutely accurate.
Barometric one however is full of crap. It looks like it generates some number from parallel universe, black hole, whatever. In short, when i have it at 4 meters, sonic shows good, but barometric will show 20 meters! I bring it to one meter, sonic is fine, barometric shows 3 meters etc. Sonthis is not even simple offset!
I landed with accurate sonic altitude, but at the moment of landing the nimber on barometric sensor was 2m. Other times I landed with negative altitude!
When it switched off motors it jumped to zero like a step.
I looked the telemetry in flight log. Interesting thing was that fast descending. Unfortunately i cant see sonic sensor data there but even without it, you can see 35m altitude *unchanged* all the time, while vertical speed is constantly 1.6m/s. Clearly the sensor is not sensing the change in altitude.
And all this crap started after my update to the latest firmware!
How do I roll back to the previous firmware? |
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