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Old 09-23-2002   #1 (permalink)
zev
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GPS (some assembly required?)
For those with more time than money, or who like a challenge, it appears that BG Micro has some Motorola 8 channel Oncore gps units for $15, less antenna.

http://www.bgmicro.com/lmad.htm
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Old 09-23-2002   #2 (permalink)
1EZway
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Thanks very much for the post...Sounds like something to good to play with and gonna order a couple.
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Old 09-23-2002   #3 (permalink)
renderman
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Cool.

Also if you look on page 3 of the last minute additions, they have the Cuecat barcode scanners of radioshack fame! Can't get those in Canada.

Thanks for the headsup!
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Old 10-02-2002   #4 (permalink)
renderman
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Just recieved my order

Damn these things are small.

You have to build your own interface and antenna, but they have instructions on the interface on the website, and the Antenna should be no problem either

Not bad for $15

Thanks again zev!
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Old 10-02-2002   #5 (permalink)
sparafina
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Quote:
Originally posted by renderman
You have to build your own interface and antenna, but they have instructions on the interface on the website, and the Antenna should be no problem either
GPS antennas are active antennas, so they are a little more complicated than wireless antennas. However, there are a number of plans out on the web, but I've seen garmin antennas for around $40-$80.
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Old 10-02-2002   #6 (permalink)
madstoft
 
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Not bad at all...18 bucks for a GPS.
Would it be possible to combine this unit with Netstumbler to dump network position and bandwidth to one file that could plotted?

Any succed with this unit yet?
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Old 10-03-2002   #7 (permalink)
outcast_p
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they also have this

http://bgm.bgmicro.com/prodinfo.asp?...ri=gps&stype=3

not bad, has the antenna w/ it.

-oc
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Old 10-03-2002   #8 (permalink)
kurtronics
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Digi-Key (www.digikey.com) sells a nice active antenna that might work real nice with the Oncore above. They currently go for $37.54 and the part # to search on is ANT-GPS-SE-SMA-ND, I use one with my Garmin II+ as part of my stumbling setup.

From Digi-Key:

"GPS w/ SMA Connector: The antenna operates from 2.5 ~ 5.5 volts and consumes as little as 4mA. The unit’s rugged
housing is fully weatherized and may be mounted via its magnetic base or integral screw receptacles."
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Old 10-03-2002   #9 (permalink)
sparafina
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Alltronics.com has the Maxim 232 IC needed for the serial interface for $2.49. Digiky also has it but only sells in lots of 100. There is also a National equivalent thats supposed to be cheaper, but I haven't found a vendor.


Dooh! BG Electronics also has the Max 233 chips.
Last edited by sparafina : 10-03-2002 at 11:35 AM.
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Old 10-03-2002   #10 (permalink)
tabasco
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Just ordered 3 of the units. So I am sure I'll be here looking for ideas.

Thanks for the great link.
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Old 10-03-2002   #11 (permalink)
tabasco
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Quote:
Originally posted by madstoft
Not bad at all...18 bucks for a GPS.
Would it be possible to combine this unit with Netstumbler to dump network position and bandwidth to one file that could plotted?

Any succed with this unit yet?
Pinky, are you pondering what I'm pondering?

I think so Brain, but wouldn't we have to write a script that will find and open AP, release/renew the IP address, then upload the netstumbler log to a remote ftp server.

This way you can send a little package on a "Walk-About" and just watches the results show up!! Gives a whole new meaning to Tracking your self-stumbling FedEx or UPS package.... Narf!!!
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Old 10-03-2002   #13 (permalink)
madstoft
 
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Found this interface IC, I wouldent know what to do with it...

http://www.ziegler.desaign.de/GPS/rs232.pdf
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Old 10-03-2002   #14 (permalink)
sparafina
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Re: Motorola M8 and M12 Bookmarks
Quote:
Originally posted by madstoft
Could you guys pls educate me in how to build the serial interface. Are there diagrams/print layout 'out there' ?

Here is what I have been able to find so far.
Also I'm looking for the WinOncore software...

Instructions and schematics for serial interface here:

http://www.bgmicro.com/pdf/acs1397.pdf

WinOncore software here:

http://www.motorola.com/ies/GPS/prod...tiontools.html

You can also purchase the chips at BG Micro, I forgot to order some and they added it to my purchase after I had committed the transaction.
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Old 10-03-2002   #15 (permalink)
zev
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NMEA codes for NS
For anyone who gets to the point of sending GPS data from their newly constructed GPS to NS, or to any other GPS data receiving application such as Streets and Trips, I have found that most applications, including NS, work well with a single NMEA position sentence. I built a box that sends only the $GPRMC sentence (exclusive OR'd for the checksum) at least every 2 seconds and that seems to keep NS and all my other applications happy. Less than once every 2 seconds seems to cause sporadic time out of NS.

Make certain that you understand where the exclusive OR begins and ends in the sentence data stream. Finally, it will help to have an operable GPS to compare sentence structure and operations and checksum values against.
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