Today's Message Index:
----------------------
1. 10:39 AM - 24 volt inverter (Ken)
2. 02:03 PM - Recording a NMEA GPS stream (Peter Pengilly)
3. 02:44 PM - Re: Recording a NMEA GPS stream (Robert L. Nuckolls, III)
4. 02:55 PM - Re: 24 volt inverter (Robert L. Nuckolls, III)
5. 02:55 PM - Re: Recording a NMEA GPS stream (Peter Pengilly)
6. 03:04 PM - Re: Recording a NMEA GPS stream (Robert L. Nuckolls, III)
7. 06:29 PM - Garmin 327 problem (Chris Fordham)
8. 06:49 PM - Re: Garmin 327 problem (Henry Hallam)
9. 09:45 PM - Re: Recording a NMEA GPS stream (Jeff B.)
Message 1
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| Subject: | 24 volt inverter |
There is a small 12 to 24 volt inverter suitable for running things like
a Turn and Bank instrument for $2.99 on ebay. Free shipping. Adjustable
output, 2 amp, 10 watt nominal or higher with cooling. Having abused one
of these a fair bit, I found them surprisingly robust so I thought I'd
mention them. My T&B only draws 0.06 amp when running but I needed a 2.5
amp C/B to handle the startup current.
ebay item 180924154518
Ken
Message 2
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| Subject: | Recording a NMEA GPS stream |
Guys,
Does anyone know anything about Arduino <http://arduino.cc/en/> boards?
Can these devices be used to monitor an NMEA datastream and record to
USB stick or SD card?
This may sound really basic to some, but it is a question that has been
occasionally exercising my brain on and off for some years, how to
record the NMEA datastream from a GPS device? About 12 years ago I was
involved in re-instrumenting a glider that required the GPS to provide
data to a glide computer that provided data to a PDA. I had only worked
with 1553 before that and had to learn about NMEA. The PDA software
vendor provided a utility that would record the datastream - which was
very useful in debugging that installation.
Since then I have occasionally wanted to record a NMEA datastream, but
not so much that I really looked into it seriously. I have recently
re-built my panel <http://www.glosterairparts.co.uk/images/After2.jpg>.
The GPS feeds into the EFIS are not working properly so now I _need_ a
datastream monitor - this device seems like it might do the trick.
Does anyone have any experience using such a board or are there any
resources on-line that explain how to do this?
Thanks, Pete
Message 3
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| Subject: | Re: Recording a NMEA GPS stream |
At 04:01 PM 8/20/2012, you wrote:
>Guys,
>
>Does anyone know anything about <http://arduino.cc/en/>Arduino
>boards? Can these devices be used to monitor an NMEA datastream and
>record to USB stick or SD card?
Sure. There are several add-ons to the
generic Arduino boards to talk to SD cards,
thumbdrives, etc.
http://tinyurl.com/8m7m7sb
The NMEA data stream is plain vanilla
RS232 levels and formatted data streams
of data delivered in a series of bytes.
I'm sure you could set up a board to
simply record the data as presented or
you could parse the string out to record
say lat, lot, gs, crs, and date-time . . .
a sort of second by second logbook of where
you've been and how fast you got there.
Bob . . .
Message 4
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| Subject: | Re: 24 volt inverter |
At 12:38 PM 8/20/2012, you wrote:
>
>There is a small 12 to 24 volt inverter suitable for running things
>like a Turn and Bank instrument for $2.99 on ebay. Free shipping.
>Adjustable output, 2 amp, 10 watt nominal or higher with cooling.
>Having abused one of these a fair bit, I found them surprisingly
>robust so I thought I'd mention them. My T&B only draws 0.06 amp
>when running but I needed a 2.5 amp C/B to handle the startup current.
>
>ebay item 180924154518
Good data point Ken. Thanks. I've got a little
bit heftier boost supply coming to fabricate
into a 19v supply for laptops in the car. Right
now, Dr. Dee plugs in a 12Dc->120AC inverter,
then the 120AC->19DC supply with the attendant
snarl of cords.
Tucking one of these boost supplies behind the
glove box with appropriate connectors on
the console will eliminate the spider web of
wire and monkey motion black boxes to a single
cord with a 5.5x2.5 connector on each end.
The supply was $9 delivered to my po box.
http://tinyurl.com/9djfxmr
You might want to poke around the installed
supply wiring with your hand-held tuned to
unused channels and the squelch open. Just
be aware of any potential for interference with
your VHF AM hardware. Even if you do find some
detectable noise, don't go on a crusade to tame
it until you know if it's strong enough to be
a problem. Being aware is forewarned. The hand-held
sniff-test is pretty sensitive and may detect
emissions that are insignificant to your installation
and use of the airplane.
Bob . . .
Message 5
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| Subject: | Re: Recording a NMEA GPS stream |
Well, a little more surfing has revealed this device
ArduLog Data Logger <http://www.hobbytronics.co.uk/arduino/ardulog>
looks like what I need, and less than 15. I know this is a UK site, but
similar stuff must exist in the US. I guess 5v from a GPS cigarette
lighter power supply will work to power it.
Pete
On 20/08/2012 22:01, Peter Pengilly wrote:
> Guys,
>
> Does anyone know anything about Arduino <http://arduino.cc/en/>
> boards? Can these devices be used to monitor an NMEA datastream and
> record to USB stick or SD card?
>
> This may sound really basic to some, but it is a question that has
> been occasionally exercising my brain on and off for some years, how
> to record the NMEA datastream from a GPS device? About 12 years ago I
> was involved in re-instrumenting a glider that required the GPS to
> provide data to a glide computer that provided data to a PDA. I had
> only worked with 1553 before that and had to learn about NMEA. The PDA
> software vendor provided a utility that would record the datastream -
> which was very useful in debugging that installation.
>
> Since then I have occasionally wanted to record a NMEA datastream, but
> not so much that I really looked into it seriously. I have recently
> re-built my panel
> <http://www.glosterairparts.co.uk/images/After2.jpg>. The GPS feeds
> into the EFIS are not working properly so now I _need_ a datastream
> monitor - this device seems like it might do the trick.
>
> Does anyone have any experience using such a board or are there any
> resources on-line that explain how to do this?
>
> Thanks, Pete
> *
>
>
> *
Message 6
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| Subject: | Re: Recording a NMEA GPS stream |
> The GPS feeds into the EFIS are not working properly so now I need
> a datastream monitor - this device seems like it might do the trick.
Hmmm . . . I missed this point the first pass through
your query. For a troubleshooting monitor, you may
be better served with a lap-top configured with an
RS-232 to USB adapter and a utility to read data
streams and put them up on the screen in real time
either as a scrolling presentation . . . or parse
of some interesting words and display current values
in a box on the screen.
I used to do this kind of stuff all the time at
Beech/RAC/HBC. I could get my laptop and data acquisition
system going and installed before the legacy service
organizations could get their work orders approved
and funded. Damn it was nice to have a dedicated
budget for such things!
Did all my lap-top work in compiled basic.
Bob . . .
Message 7
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| Subject: | Garmin 327 problem |
Just hoping someone else has run across this problem and better still
has a solution. I have a new Garmin 327 installed in a ragwing aircraft.
When the Transponder is switched to Alt. the correct altitude shows up
on the Garmin but the controllers can't read the altitude, the Ident
function works. It's a stand alone Transcal encoder.
Thanks Kit
Message 8
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| Subject: | Re: Garmin 327 problem |
Probably an issue with the transponder antenna or connection between
the antenna and the transponder. A marginal connection between the
xpdr and antenna can give a weak return signal that is strong enough
for Mode A / Ident but not strong enough for Mode C. The correct
altitude readout on the Garmin 327 indicates that the encoder and
encoder-transponder connection is fine.
Good luck,
Henry
On Mon, Aug 20, 2012 at 6:27 PM, Chris Fordham <fconsult@telus.net> wrote:
> Just hoping someone else has run across this problem and better still has a
> solution. I have a new Garmin 327 installed in a ragwing aircraft. When the
> Transponder is switched to Alt. the correct altitude shows up on the Garmin
> but the controllers can't read the altitude, the Ident function works. It's
> a stand alone Transcal encoder.
> Thanks Kit
>
>
Message 9
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| Subject: | Re: Recording a NMEA GPS stream |
If you're really interested in embedded programming and you want to avoid
the laptop, the Arduinos probably will fit the bill. However, if you just
want to troubleshoot NMEA, then a laptop with serial port (or USB adapter)
and software would be fastest. You can probably tap off the GPS' TxD pin
to your laptop's RxD pin.
A Google search turns up a few programs, none of which I have experience
with, but all look useful of some sort.
http://www.visualgps.net/visualgps/
http://homepage2.nifty.com/k8/gps/
http://www.aviadesign.com/Monitor/
-Jeff-
On Mon, Aug 20, 2012 at 4:00 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> The GPS feeds into the EFIS are not working properly so now I *need* a
> datastream monitor - this device seems like it might do the trick.
>
>
> Hmmm . . . I missed this point the first pass through
> your query. For a troubleshooting monitor, you may
> be better served with a lap-top configured with an
> RS-232 to USB adapter and a utility to read data
> streams and put them up on the screen in real time
> either as a scrolling presentation . . . or parse
> of some interesting words and display current values
> in a box on the screen.
>
> I used to do this kind of stuff all the time at
> Beech/RAC/HBC. I could get my laptop and data acquisition
> system going and installed before the legacy service
> organizations could get their work orders approved
> and funded. Damn it was nice to have a dedicated
> budget for such things!
>
> Did all my lap-top work in compiled basic.
>
>
> **
>
> ** Bob . . .
>
>
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