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PICList Thread
'GPS units'
1999\11\01@061143 by Russell McMahon

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- Has anyone who bought the $20 GPS units done a master reset and then had
successful subsequent operation?
- Are there any users in the Southern hemisphere?

A friend fired up one of these today and after a little playing sent one of
the commands which the $20 GPS site said seemed not to work.
After this the unit seemed not to work at all :-)
Sending a master reset command still doesn't produce output.

The unit reports seeing a number of satellites but all report zero signal
level.
He theorises that the unit may be "estimating" its start position and
deeming all satellites below the horizon as we are in southern hemisphere.
I don't know if this is a good explanation.

Has anyone else had the unit "go to sleep" on them?





     Russell McMahon
_____________________________

>From another world - http://www.easttimor.com

What can one man* do?
Help the hungry at no cost to yourself!
at  http://www.thehungersite.com/

(* - or woman, child or internet enabled intelligent entity :-))

1999\11\01@110707 by White Horse Design

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<x-flowed>At 11:40 01/11/1999 , you wrote:
>- Has anyone who bought the $20 GPS units done a master reset and then had
>successful subsequent operation?
>- Are there any users in the Southern hemisphere?
>
>A friend fired up one of these today and after a little playing sent one of
>the commands which the $20 GPS site said seemed not to work.
>After this the unit seemed not to work at all :-)
>Sending a master reset command still doesn't produce output.
>
>The unit reports seeing a number of satellites but all report zero signal
>level. He theorises that the unit may be "estimating" its start position and
>deeming all satellites below the horizon as we are in southern hemisphere.
>I don't know if this is a good explanation.
>
>Has anyone else had the unit "go to sleep" on them?

Hmmm.

Zero signal level is curious, but GPS can take a while to download all of
the almanac data if it has absolutely none, 15 minutes.

Are these Y2K compliant units?

Regards

Adrian
---
WWW    WWW   Adrian Gothard
WWW WW WWW   White Horse Design
WWWWWWWWWW   +44-385-970009 (Mobile/SMS), +44-118-962-8913/4 (voice/fax)
WWWW  WWWW   spam_OUTwhdTakeThisOuTspamzetnet.co.uk, http://www.users.zetnet.co.uk/whd
---
Developers of GPS satellite-based tracking systems for vehicles/helicopters

</x-flowed>

1999\11\01@123015 by Andres Tarzia

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I don't think that the unit is looking for another set of satellites. After
all, the "G" in "GPS" is for GLOBAL. The very first time that you power up a
GPS unit, it has to build a lot of tables and may take more than 10 minutes
to initialize. Try powering the system on, and then go for lunch. After you
return there should be useful data at the display.

Regards,
Andres Tarzia
Technology Consultant, SMART S.A.
e-mail: .....atarziaKILLspamspam@spam@smart.com.ar


{Original Message removed}

1999\11\01@180143 by Agnes en Henk Tobbe

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>- Has anyone who bought the $20 GPS units done a master reset and then had
>successful subsequent operation?

   Yes, I have done a master reset and it took a couple of hours  before
the unit seemed to be able
   to know where it was again. (The reset was done by means of the 20$GPS
VB programme). At
   first I thought "Well that was it then....", So do not dispair....

>- Are there any users in the Southern hemisphere?


   Yes, 32.782989 degrees South. (152.107697 degrees  East = NSW Australia)

While on the subject: Someone made a PIC driven unit to convert to NMEA
standard. I do  not
want that standard. Just data to a LCD but am not very good in mathematics.
Has anyone done
the conversion from 4 byte real (units 1/256 seconds) to degrees, minutes
and seconds in a PIC
in assembler?
It would look something like ((B1*256^3)+(B2*256^2)+(B3*256)+B4)/3600)/256.
Would a simple
16F84 be able to do that?

Henk VK2GWK (PA0ADC)

1999\11\01@193532 by Mark Willis

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Agnes en Henk Tobbe wrote:
{Quote hidden}

On that math, no problem on an 'F84;  what you're talking about is
simply generating a 32-bit number from the 4 bytes B1, B2, B3, B4, then
dividing it by 3600 and by 256.  You can start off by doing the divide
by 256 (just shift the decimal place - B4 is now to the right of the
decimal place) - then divide by 3600.  Scott Dattalo or someone probably
has a better way here, of course.

 Mark

--
I do small package shipping for small businesses, world-wide.

1999\11\01@215554 by Geoff Child

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<x-flowed>where do you buy these $20 GPS's


{Quote hidden}

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</x-flowed>

1999\11\02@041855 by Picsend

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Hi Russel,

> where do you buy these $20 GPS's

see:
http://gps.instanet.com/
http://www.clientprofiles.com/display/

It can be of interest. But I think they are sold out now.


SP

1999\11\02@091217 by miked

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{Quote hidden}

The BGMicro(Trimble) units are not compliant for Date except in the binary
mode.

1999\11\02@134238 by Nikolai Golovchenko

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>> Has anyone done
>> the conversion from 4 byte real (units 1/256 seconds) to degrees, minutes
>> and seconds in a PIC
>> in assembler?
>> It would look something like
((B1*256^3)+(B2*256^2)+(B3*256)+B4)/3600)/256.
{Quote hidden}

Yeah. Peace of cake..  :)

1. Convert to degrees
deg = B1B2B3B4 / (3600 * 256)
You will need 32 by 24 fixed point divide routine from Application Note 617.
2. Convert residue to minutes
min = res / (60 * 256)
Same routine may be used, though 24 by 16 is enough.
5. Convert residue to seconds and "subseconds"
sec = res / 256 - higher byte of residue
ssec = res - sec * 256 - lowest byte of residue

1999\11\02@153708 by Agnes en Henk Tobbe

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>where do you buy these $20 GPS's
>
see http://mavin.com/slickitems.html
but sold out.....

1999\11\03@093748 by Jerry Iacobucci

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GPS Unit from slickitems.

Normally the GPS outputs the CACA data format every second but,  from
programmers manual you can also issue a GPS condition command C6C6, and the
data returned, longitude & latitude degrees is in BCD format so no
conversion is needed.

Jerry

1999\11\16@102441 by eplus1

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The following is Scott Dattalos belated reply to a post from the piclist
that I forwarded to him since his name was mentioned in it. You may remember
that Scott (and Tajaart and ....) left the PIClist due to an excessive
volume of unmarked and often childish off topic posts which he felt wasted
more of his time than he could afford. Even off the list, Scott can't resist
the impulse to help, and suggested that I forward his "better way" back to
the list.

James Newton jamesnewtonspamspam_OUTgeocities.com phone:1-619-652-0593
http://techref.homepage.com NOW OPEN (R/O) TO NON-MEMBERS!
Members can add private/public comments/pages ($0 TANSTAAFL web hosting)
PICLIST guide: http://204.210.50.240/techref/default.asp?url=piclist.htm


{Original Message removed}

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