New DJI firmware 5.02

D

DennyR

Active Member
Just finished talking with Sandor and he informs me that a new version has just this min. been posted. BTW Boris, he did have a solution to that problem and he told me how to fix it, it was not a lie. Also some sneak preview of what is coming from DJI in the form of camera mount and on screen video display stuff. They are taking this stuff very seriously. 5.02 should fix the Okto problem on Ch.2
 
Last edited by a moderator:

quadcopters

quadcopters

Quadcopters.co.uk Drone Specialists
Firmware notes.
What’s changed?
Fix the no output problem when you are using traditional receiver and Octo-rotor.
Optimize the gimbal control; reduce the gimbal shaking when GPS signal is weak.

Geoff
 

BorisS

BorisS

Drone Enthusiast
As long as he doesnt share it with those in need, I personally think its better to be considered a lie. Sounds better than i just dont want to help (because my arrogance was scratched), although i needed your guys help before :)

Thanks for the info 5.02 !!!

Boris
 


D

DennyR

Active Member
BorisS said:
blind this morning were is the sneak preview stuff ?

Htnaks


Boris
Click to expand...
In fairness to DJI it is up to them to decide when the time is right. Just to let you guys know that it is in the pipe and they are fully committed to move fast on this.
 

BorisS

BorisS

Drone Enthusiast
really hope for us users and for them and their venture that it will be as good as advertised at the beginning, would make me happy. What do you mean with the screen video display stuff ? Can you say something more about it. Something similar like a jeti box for your radio or OSD stuff ?

Thanks

Boris
 


BorisS

BorisS

Drone Enthusiast
All i hope is that we are not seeing a PH DJI cooperation on the gimbal, otherwise i will be the last to adopt and really wait this time for enduser reports. But reading a lot of threads in different forums there is a lot of sliming going on between PH and DJI so I wouldn't be surprised :)

Boris
 

D

DennyR

Active Member
I doubt that as I would expect it to be a direct drive system with a high sensitivity imu. When you place the imu on the camera mount and use a gear drive any servo opposite reaction movement will be seen by the imu and cause an oscillation. So gains have to be min. Any feedback system will need a pid algorithm which is effected by camera weight/inertia and will be too slow. And that aint the way to do it IMHO. I expect the imu will be isolated on the airframe and drive the high speed DD servos from a signal based on the airframe disturbance alone. i.e. 10 deg. of disturbance = 10 deg. of servo travel. Anti vibration movements will be minimal. The Chinese can make it a lot better and cheaper than anyone else.
 

BorisS

BorisS

Drone Enthusiast
Correct me if i am wrong. But up to now we have seen and experienced that WKM is at par with MK when it comes to wind and dealing with it, so not very good. Wobbles hard small correcting movements. So if the IMU is completely isolated from the main frame how is it going to interpret these small hard corrections if it doesn't have a direct feedback from the frame, were is the threshold of whats necessary to be sensed.

But maybe you mean that with a signal based from the airframe ? so what you are getting at if i understand you correctly is the gimbal will get feedback from a isolate IMU and from the WKMs IMU using the data from both IMU and making the best out of it ?
 

DucktileMedia

DucktileMedia

Drone Enthusiast
So when DJI's website says it can fly in up to 17.7 mph of wind, does that mean it will just barely have authority and not drift off? I didnt expect it to get smooth flight in that kind of wind but I would love to know that if I get a gust at 300+ feet I can at least bring her home safely.
 

D

DennyR

Active Member
Boris
What the imu has to do is create a reverse mirror image of the disturbance that the airframe sees. If the imu is on the mount it will see all kinds of other movements and when it makes a correction it will induce more movement that is not a part of that mirror image. In the same way that your model needs a pid algorithm to correct overshoots etc. Feedback is not required. The output volume is spanned to the disturbance during set-up. What DJI suffers from is non linear output vol. It lags behind on the initial movement which means it has to play catch up. it is a typical signature of the ADX 620 gyro. Same with MK. made worse by having limited gain to stop oscillations.
My own imu will have an output vol. control rather like a expo curve. Only it can be bent pos. and neg. several times across the range. 9Dof and built in 12 bit ADC.
D.
 
Last edited by a moderator:

L

llbr22

Member
Here's that video I was talking about Yuri where I flew in Redwood park to avoid the high winds in the bay area.. but in certain areas the gusts were still intense blowing my rig straight to the ground. I didn't take it above 50' because I was too scared. You can see the branches move on the 1st shot and very last few shots:
http://youtu.be/UFTBHSU0eZ0
 



R

RTRyder

Merlin of Multirotors
llbr22 said:
Here's that video I was talking about Yuri where I flew in Redwood park to avoid the high winds in the bay area.. but in certain areas the gusts were still intense blowing my rig straight to the ground. I didn't take it above 50' because I was too scared. You can see the branches move on the 1st shot and very last few shots:
http://youtu.be/UFTBHSU0eZ0
Click to expand...

I've flown the CineStar 6 and my MK Hexa in stronger winds than that, neither one was a relaxing flight. The big problem as you experienced is the wind taking the lift out from under the props and the resulting instant decrease in altitude. Just as much fun is when the opposite occurs and the lift below the props is increased and the sudden gain in altitude is just as disturbing as a sudden decrease.

As I was trying to land the Hexa an updraft caught it and with the throttle all the way down it climbed a good 30 feet in a split second and then proceeded to fall just as far just as fast, I caught it just before impact with a full throttle burst that shot it skyward again. Turned off vario altitude hold and slowly managed to coax it down to the ground, end of flying for the day, time to clean the underwear...:eek:

Ken
 

BorisS

BorisS

Drone Enthusiast
little off topic but for me most impressive flight in wind i have seen up to now

 
Last edited by a moderator:


You must log in or register to reply here.
Top