Re: [Paparazzi-devel] Interference in flight Umarim lite 2.0

[Martin Mueller]

Hi Joseph,

> I have tried running the motor with propeller on a bench. After a good
> run, when close to my metal door, the servos don't respond instantly to
> the radio and have glitches. i also noticed that when this happens, the
> OK radio indicator  in the GCS is half green half orange .

this now sound like there is an issue with the RC receiver rather then 
the servos. Correcting my last email: All grounds should be connected at 
one point near the battery ground (like in a star). No parts should be 
chained.

Where is the receiver ground connected?

> I connected the servos to the umarim ground but didn't notice any change
> in my bench test (no flight). i then grounded the motor mount and added
> aluminium connected to the ground around the RX - Umarim cable section
> touching the battery wires. This improved my bench test, I do not see
> any glitches and the OK button is now 90% green.
>
> I went to fly and it went much better. In MANUAL I don't seem to have
> issues but I didn't go full throttle after take off, however in AUTO1, I
> still have glitches as the HOME mode kicks in and the plane goes down in
> a spiral.

From what you say there seems to be a relation between the ESC/motor 
with full throttle and the receiver. Can you replace any of the parts? 
Paparazzi detects that the RC signal is bad and goes to home mode - 
which is auto2. Have you tuned the aircraft in auto2 mode?

Martin

> Joseph
>
>
>     Hi Joseph,
>
>      > My plane flies great and is properly set up for AUTO1. However,
>     during
>      > the last two flights I could only control the plane
>     intermittently.  As
>      > soon as I would start throttle again I would lose control of the
>     plane.
>      >
>      > On the ground everything works fine including range test.
>      >
>      > All wires are twisted but none are shielded.
>      >
>      > Grounding:
>      > -ESC and Umarim share the same ground from the battery supply
>      > -ESC's BEC seem to have common ground (measures 0 V between Umarim
>      > ground and BEC ground)
>      > -RX and Xbee get the ground from Umarim
>      > -Servos get +5V and ground from ESC's BEC
>      > -No ground on motor or motor plate
>      >
>      > I am not sure where to start, if anyone has had a similar issue and
>      > found a fix that would help me a lot.
>
>     sounds like a ground issue. Between the Umarim and the servos ground
>     line is the battery -> ESC path. If you run the engine you will have a
>     current in that path that creates a voltage that disturbs the servo
>     signals. Try connecting the servos ground directly to the Umarim.
>
>     If that helps maybe the "Large Aircraft Connection Diagram" picture in
>     the Wiki needs an update.
>
>     Martin
>
>
>
>
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