Re: Re: [Paparazzi-devel] LEA-5H NoFix Issue

[Pat Hickey]

I don't think I can offer much more expertise on this issue - I ran
into the problem trying to power the LEA-5H from a USB port in my
Linux port of the autopilot. I just found that some laptop USB ports
work better than others, and a powered hub was the only sure way to
get a lock.

The 3.3v regulator on the Tiny board isn't designed to deliver too
much current - I'd look up on the spec sheets what its rated for. You
may need to power it from a separate 3.3v regulator. I had numerous
problems with the power supplies back when I used a Tiny, not sure how
many were due to board defects or faulty parts though.

On Fri, Mar 5, 2010 at 1:59 PM, address@hidden
<address@hidden> wrote:
> Hi there,
>
> Thanks for your reply. Good to hear that it's not a issue with this general 
> setup.
> Got it from PPZUAV, I'm using a 11.1 V LiPo pack to power the TWOG, the GPS 
> unit is attached to the TWOG via the pins
> GND-3.3v-TXD0-RXD0 of the gps plug.
> Could you send me the
> u-center configuration file of your GPS unit? Just to compare it to mine.
>
>
>
> Regards
>
>
>
>
>
> ----Ursprüngliche Nachricht----
>
> Von: address@hidden
>
> Datum: 05.03.2010 17:46
>
> An: <address@hidden>, <address@hidden>
>
> Betreff: Re: [Paparazzi-devel] LEA-5H NoFix Issue
>
>
>
> Hi Nicola,
>
>
>
> I am not too much experienced in Paparazzi, but my LEA-5H+Sarantel+Twog
>
> works without any problem in spite of the fact that I am using a 7.6V LiPo
>
> accupack. The hardware was shipped by CheBuzz.
>
>
>
> Can you describe more detailed the power supply of your GPS?
>
>
>
> Balazs
>
>
>
>
>
>
>
>
>
>> Hi Pat and thanks alot for your reply,
>
>>
>
>> It seems indeed that the issue is power-supply related, as the current
>
>> indicator on the GCS shows way more
>
>> fluctuation as soon as the GPS starts to look for its servers. Or is that
>
>> normal?  See image;
>
>> http://img59.imageshack.us/img59/9461/strangevoltage.jpg
>>
>
>>
>>
>> Notations to the image;
>> 1) is without GPS connected... as soon as its connected it looks the same
>> but voltage displayed goes up to 11v...
>> tiny spikes, no drops
>> 2) is the phase where the GPS looks for servers... looks nasty..
>> 3) is after 2-3 minutes outside. Still some spikes and drops, but not that
>> bad anymore
>>
>> I tried to change some power supply related settings in u-center, but with
>> no success.
>>
>> Please tell me how you solved your issues Pat, external power supply just
>> for the GPS? Are
>> we the only SPK-LEA5H+TWOG users out there having this or similar issues?
>> If yes, might this be related to defective
>> hardware of some kind?
>>
>>
>>
>> Regards
>>
>>
>>
>> ----UrsprĂźngliche Nachricht----
>>
>> Von: address@hidden
>>
>> Datum: 05.03.2010 05:06
>>
>> An: <address@hidden>, <address@hidden>
>>
>> Betreff: Re: [Paparazzi-devel] LEA-5H NoFix Issue
>>
>>
>>
>> I've had a similar issue with that model GPS: I found, finally, that
>>
>> the current available from the power supply seems to matter. Check
>>
>> your power supply and make sure it isn't dipping down too far when you
>>
>> attach the GPS.
>>
>>
>>
>> On Thu, Mar 4, 2010 at 11:25 AM, address@hidden
>>
>> <address@hidden> wrote:
>>
>>> Hello everybody,
>>
>>>
>>
>>> I'm getting a odd issue when trying to get a GPS Fix in the Paparazzi
>>> GCS. In U-center I can get a 3d fix in ca. 30
>>
>>> secs no issues, but in the GCS it's never able to get a fix. It finds
>>> multiple servers, the signal strength goes up
>> to
>>
>>> ~40dB and after a couple seconds the signal dies again and the GCS moves
>>> on to the next server over and over again.
>> The
>>
>>> bars stay red until the signal dies, then they turn grey. In u-center
>>> the message output looks great (to me), in the
>>
>>> GCS only some messages do display a value and those are pretty
>>> unrealistic.
>>
>>>
>>
>>>
>>
>>>
>>
>>> This is from my airframe.xml;
>>
>>>
>>
>>> [...]
>>
>>>
>>
>>> CONFIG = \"tiny_2_1_1.h\"
>>
>>>
>>
>>> [...]
>>
>>>
>>
>>> ap.CFLAGS += -DGPS -DUBX -DUSE_UART0 -DGPS_LINK=Uart0
>>> -DUART0_BAUD=B38400 -DGPS_USE_LATLONG
>>
>>>
>>
>>> ap.srcs += gps_ubx.c gps.c latlong.c
>>
>>>
>>
>>>
>>
>>>
>>
>>> I've tried to:
>>
>>>
>>
>>> -reset the GPS module using u-center and load the config file from the
>>> Wiki ( http://paparazzi.enac.fr/wiki_images/Tiny_LEA-5H-v5.zip
>>
>
>>> ) with no different end result.
>>
>>>
>>> -reset the GPS module and configured everything from hand per the Wiki's
>> directions with no different end result.
>>> -Flash the different Firmware Updates into the gps receiver ( 5.00 /
>>> 6.00 /
>> 6.02 )
>>
>>> with no different end result.
>>
>>>
>>
>>>
>>
>>>
>>
>>> My setup:
>>
>>>
>>
>>> Twog // PPZUAV LEA-5H+active Sarantel Geohelix Antenna
>>> //XbeeProSeries2,2.4Ghz
>>
>>>
>>
>>>
>>
>>>
>>
>>> If someone could explain to me what I'm doing wrong I'd highly
>>> appreciate that. I'm stuck since days here.
>>
>>>
>>
>>> If I shall post the message view output of u-center or my whole
>>> airframe-config file just tell me what you need.
>>
>>>
>>
>>>
>>
>>>
>>
>>> Regards,
>>
>>>
>>
>>>
>>
>>>
>>
>>> Nico
>>
>>>
>>
>>>
>>
>>>
>>
>>> _______________________________________________
>>
>>> Paparazzi-devel mailing list
>>
>>> address@hidden
>>
>>> http://lists.nongnu.org/mailman/listinfo/paparazzi-devel
>>>
>
>>
>>
>>
>>
>>
>>
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>> address@hidden
>> http://lists.nongnu.org/mailman/listinfo/paparazzi-devel
>>
>
>
>
>
>
>
>
>
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