Litchi gimbal dance part 2

[DavidGlennPDX]

So, I have had this happen once before and I thought it a fluke.
Took an auto flight over a local HS football field this Presidents day using Litchi.
The craft was just starting to lose controller contact sporadically as it reached the field
There was a single POI in the center of field.
I get that if the controller loses contact the gimbal will not adjust, but why does it do this?
I was not adjusting gimble here manually

To view this content we will need your consent to set third party cookies.
For more detailed information, see our cookies page.

Accept third party cookies

 

[lisadoc]

The craft was just starting to lose controller contact sporadically as it reached the field

There's your answer right there. As the controller regains contact, it sends signals back to the drone to change gimbal to the updated angle. If it loses contact again and then regains it, same thing. As a result, the gimbal can swing wildly, trying to figure out what command it should follow.

 

[dvarapala]

There's your answer right there. As the controller regains contact, it sends signals back to the drone to change gimbal to the updated angle. If it loses contact again and then regains it, same thing. As a result, the gimbal can swing wildly, trying to figure out what command it should follow.

Hmm...
If you lose contact with the Mavic during a waypoint mission the Mavic will complete the mission autonomously; does that autonomy not include the gimbal positions?

 

[lisadoc]

Hmm...
If you lose contact with the Mavic during a waypoint mission the Mavic will complete the mission autonomously; does that autonomy not include the gimbal positions?

No. Unfortunately, it does not. Not sure technically why it can't, but it is documented. This drove me nuts for a while before I found out this fact. But it is buried in the manual for Litchi - one singular line:

"Litchi can control the gimbal pitch automatically during the mission, as long as the aircraft is within range of the remote controller."

 

[dvarapala]

No. Unfortunately, it does not. Not sure technically why it can't, but it is documented. This drove me nuts for a while before I found out this fact.

Wow, that's surprising. Good to know!!

 

[DavidGlennPDX]

Still, this is something differing I think. I mean, there was a single POI, center field, so if the gimble loses signal to tell it where to point it should just stay where it is pointed at, on aquiring signal again it should then shift back to center field. But here we see wild swings down and then up to the sky.

 

[DavidGlennPDX]

I have bought UGcs and will try testing when the weather improves to see how it handles the signal loss by setting a route and blocking the controller signal

 

[lisadoc]

I have bought UGcs and will try testing when the weather improves to see how it handles the signal loss by setting a route and blocking the controller signal

It has done the same thing for me when losing/acquiring the signal, so it’s not something unique to your situation.

 

[DavidGlennPDX]

You mean ugcs also does the gimble thing or litchi?

 

[dvarapala]

Now this is very interesting.

Apparently once you lose your signal, gimbal pitch settings no longer function. I found this to be true when flying Litchi mission using an iPad mobile but not when using an android. Below is some tests/mission I flew. All 4 are the identical mission created with "Mission Hub". The 2 on the left was shot when using an iPad, 2 on the right are android. Once the videos on left lose uplink, pitch never changes during the remaining part of the mission. The ones on the right however work as expected even with no uplink signal.

So what could account for this difference? IIRC, Android devices are programmed in Java, whereas iOS devices are programmed in ObjectiveC. This suggests that DJI maintains 2 separate versions of their SDK, one for each platform. It's entirely possible that the feature set is not exactly the same between the two, and/or bugs exist in one but not the other.

 

[lisadoc]

Read the rest of the post. No one else can duplicate this and in fact they all attest to the fact that it doesn't work with Android either.

 

[lisadoc]

You mean ugcs also does the gimble thing or litchi?

Litchi does the same when I lose/regain signal intermittently.

 

[dvarapala]

Read the rest of the post. No one else can duplicate this and in fact they all attest to the fact that it doesn't work with Android either.

And yet nobody can explain the videos either. It's a mystery wrapped up in an enigma.

 

[AlexeyD]

I have bought UGcs and will try testing when the weather improves to see how it handles the signal loss by setting a route and blocking the controller signal

UgCS uses mission commands to control gimbal.

Do not forget to select Action on lost of RC = Continue in route parameters:



Very important that in such case your route should have last waypoint close to the desired landing point.