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Garmin GPS Interface HELP — Parallax Forums

Garmin GPS Interface HELP

autobus83autobus83 Posts: 6
edited 2008-02-10 21:49 in BASIC Stamp
I am just getting into serial data transfer with the basic stamp. I have an Etrex Legend and I have the serial cable. If I have done my home work right then pin 3 on the GPS is data out and pin 4 is ground. I am wondering how to wire it to the stamp. Do I put pin 3 to the serin pin and the ground just to the ground on the stamp. Also any other good information on this that anybody has would be greatly appreciated.

Adam

Comments

  • LarryLarry Posts: 212
    edited 2008-02-10 01:49
    It's been a while since I soldered up mine, but I'm pretty sure all that is needed is a 22KΩ resistor in the data line.

    This is both to protect the Stamp and the Etrex, which I believe is a 3.3v device.

    I left the other data direction line unconnected, and I also didn't connect the 3.3v power.

    Post Edited (Larry) : 2/10/2008 5:19:39 PM GMT
  • sylvie369sylvie369 Posts: 1,622
    edited 2008-02-10 20:38
    Since the Garmin already has a RS-232 interface, a board like this

    http://www.awce.com/rs1.htm

    to convert to TTL should do the trick. I put together two of 'em a month ago, and am working on a Basic interface to the RS-232·telemetry output from a small rocket altimeter.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2008-02-10 21:49
    Larry's idea should be adequate. You don't need a fancy RS232 converter. Just remember when you get to the programming phase that your data is inverted. So set your BaudMode constant accordingly.

    -Phil
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