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

Attached is the wiring diagram that solved my noise issue.

I am happy to add it to the Umarim wiki page if people think this is an elegant solution.

Joseph

Date: Wed, 27 Feb 2013 08:51:55 +0100
From: "Prof. Dr.-Ing. Heinrich Warmers" <address@hidden>
To: address@hidden
Subject: Re: [Paparazzi-devel] Interference in flight Umarim lite 2.0
Message-ID: <address@hidden>
Content-Type: text/plain; charset="us-ascii"; Format="flowed"

Hi Joseph,
can you push a photo of the wireing ?
This will help other users.
Tanks
Heinrich

Joseph Muhlhausen schrieb:

> I solved the issue. I flew at the same location and I am not
> having interference anymore.
>
> - I used the common ground star pattern
> - Added a toroid on the Rx - Umarim cable
> - Shielded the Rx - Umarim cable
> - Added an L-C filter on Battery - Umarim/common ground cable
>
> My gut feeling tells me the LC filter did it, but since I didn't try
> the different fixes separately I am unable to tell.
>
> For info my system pulls 52 Amps at full throttle.
>
> Joseph
>
> Hi Martin, thanks a lot for your help
>
> 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?
>
> RX, Xbee, GPS and now servos get ground from Umarim
> ESC gets ground from the battery
> Umarim gets ground from the battery
>
> I am assuming this is OK and close to a star pattern.
>
> Paparazzi detects that the RC signal is bad and goes to home mode -
> which is auto2. Have you tuned the aircraft in auto2 mode?
>
> No I haven't setup AUTO 2 and HOME does not seem to be working
> properly, unless the GPS suffers from interference too. The
> simulation works very well for both HOME and AUTO2
>
> From what you say there seems to be a relation between the ESC/d
> the issue. I flew at the same location and I am not having
> interferences anymore.
>
> - I used the common ground star pattern
> - Added a toroid on the Rx - Umarim cable
> - Shielded the Rx - Umarim cable
> - Added an L-C filter on Battery - Umarim/common ground cable
>
> My gut feeling tells me the LC filter did it, but since I didn't
> try the different fixes separately I am unable to tell.
>
> For info my system pulls 52 Amps at full throttle.
>
> Joseph
>
> motor
> with full throttle and the receiver. Can you replace any of the parts?
>
> I graphed yesterday's flight and the current pic and RC (short)
> signal loss are clearly correlated. Unfortunately I have only one
> TX (Graupner mx 16 HoTT 2.4ghz) and one RX (Graupner GR16 HoTT)
>
> I tested other options. Adding Toroids between RX -- Umarim and
> Servos -- Umarim seem to clean the signal a lot. OK is now 100%
> green and servos don't make hissing noise when neutral. Will this
> work in flight... I am not sure, but it's an improvement.
>
> Something that may be important, the +5V for the servos is still
> coming from the ESC.
>
> Joseph
>
> Date: Sun, 17 Feb 2013 08:44:35 +0100
> From: Martin Mueller <address@hidden <mailto:address@hidden>>
> To: address@hidden <mailto:address@hidden>
> Subject: Re: [Paparazzi-devel] Interference in flight Umarim
> lite 2.0
> Message-ID: <address@hidden
> <mailto:address@hidden>>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> 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
> >
> >
> >
> >
> > _______________________________________________
> > Paparazzi-devel mailing list
> > address@hidden <mailto:address@hidden>
> > https://lists.nongnu.org/mailman/listinfo/paparazzi-devel
> >
>
>
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>
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From:	Joseph Muhlhausen
Subject:	Re: [Paparazzi-devel] Interference in flight Umarim lite 2.0
Date:	Thu, 28 Feb 2013 12:27:10 -0500