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GPS modules ?

Discussion in 'Electronic Design' started by MC, Mar 26, 2005.

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  1. MC

    MC Guest
  2. Alex Gibson

    Alex Gibson Guest

    Could someone recommend a gps module suitable for use
    in embedded projects (pic and lpc21xx) , robotics and hooking up to a
    (laptop/pc with windows and osx drivers).

    Either 3V or 5V powered, ASCI output via rs232 or i2c or spi - (NMEA 0183)
    and under 10cm by 10cm (5cm by 5cm or under would be better).

    Start up time isn't a concern , up to a couple of minutes is fine

    Quite a few out there, just wondering which ones people use more and
    are fairly cheap , easy to use , reliable and rugged/robust.

    I had a bit of a look at a few (first three look quite good)
    UV40 - Laipac
    TF30 - Laipac
    Lassen iQ - Trimble

    Rikaline GPS-23
    Jupiter 12
    Leadtek 9543

    UV40 , TF30 and Lassen listed here


    Jupiter and leadtek GPS-9543 - bit pricy

    Alex Gibson
  3. Hey Alex, have you looked at Navman? I think they're over on your side
    of the globe, NZ. See the Juptier Pico and Calisto.

    I've used the Jupiter 11. Nice thing is they have a dead reckoning
    input, for wheel sensors, so they can do a better job of predicting
    motion. Reasonably priced, I thought.
  4. DS

    DS Guest

    Hi Alex,

    How's the cricket going?

    Seriously, though, I am a newbie, but have come across some interesting
    articles on interfacing to GPS. One is in Everyday Practical Electronics,
    Jan 2004 issue, ( go to web site for assembler code - you will have to muck
    about a bit with their Assembler application software to translate it to
    Microchip's MPASM format - ), but it is very in -

    Or, there has been a couple of articles in Nuts n Volts (USA) magazine using
    the BASIC Stamp (search through website for the article).

    I think these projects used Garmin.

    I can e-mail the first article or post it here if u like.


  5. dmm

    dmm Guest

    Have you had a look at Freescale's (Motorola) FS Oncore?

    Or even the old standy, Garmin?
  6. WDino

    WDino Guest

    You can buy combined GPS modules and antennae for about $80 off the net (try eBay).
    These small devices can be obtained with either a standard RS232 or USB output.
    They put out the information in standard NMEA format (which basically means that
    it can be read directly by a microprocessor).
    I am using them with a Picaxe08 micro to monitor the movement of cattle via a
    small solar-powered collar around their neck. And for RC airplanes with a tiny
    300 MHz (approx) transmitter from Oatley.

  7. Digital cattle? Sounds like something from a bad SCI-FI movie. ;)

  8. I've used the UBlox TIM-LP and GPS-MS1E in a couple of designs.
    They run off 3.3V and provide CMOS level asynchronous outputs.
    They can provide either NMEA or a binaryn packet protocol
    as output.


    You can even buy samples through their web site. IIRC, the
    TIM-LP modules are about $110 each.

    Mark Borgerson
  9. peterk

    peterk Guest

    Tracking cattle by GPS seems to be a popular thing to do. There is a
    picture here.


  10. I'd rather see them on usenet kooks, trolls and spammers so we could
    make sure they don't get near a working computer.

    I'm sure they are quite useful to ranchers when livestock goes
  11. I read in that Michael A. Terrell
    Mavericks arise! You have nothing to lose but your tracking devices!
  12. CBFalconer

    CBFalconer Guest

    Where, oh where, has my little dogie gone.

    Bad doggerel, bad.

  13. Check out: :)
  14. Guest

    Try Furuno... I know they make some that are maybe 1/4" x 1" x 2" (6 mm
    x 25 mm x 50 mm), connector for external antenna, 5.0 or 3.3 V, serial
    output in standard ASCII formats. I think it's logic serial and you
    need to follow with a MAX232 or equal to get RS232 serial. One antenna
    I have seen used is a "puck" that is maybe 1/2" thick by 2" diameter (13
    mm x 50 mm).

    Matt Roberds
  15. Where are you going to put a troll or spammer that they wouldn't come
    within the tracking error(say 20 meters in an urban canyon) of a
    working computer?
    So how do the cows transmit back their position? Or do they log
    the positions to see where the cows go when they aren't watching?

    Mark Borgerson

  16. I was thinking more along the lines keeping them at the bottom of the
    Grand Canyon.

    You've got me. I haven't been near a live cow in almost 39 years. I
    prefer my cows already processed. In fact, there's some beef cooking in
    my crock pot full of chili right now.

    I didn't start the part about the digital cows, I just commented on
  17. maybe they found a use for the Iridium network, unless the cows are
    inside a building, but then you should know where they are


    Opinions are like assholes -- everyone has one
  18. Chris

    Chris Guest

    (try eBay).

    Can you give some more info on the ones you are using?

  19. Joop

    Joop Guest

    I recently bought a Polstar PGM-111 and are pleased with it. This is a
    small GPS mouse so the antenna and magnet is built in. Power is 5 to
    9Vdc. It has TTL and RS232 on the PS2 connector. The supplied USB
    converter also can provide power (120mW appr. according to specs).
    Output is NMEA. Chipset is SirfII so pretty modern.
    Price was 70 Euro. If you are in the US, look at ($89).

  20. Joop

    Joop Guest

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