Nikon D200 / D300 and GPS

Discussion in 'Nikon' started by Chris W, Nov 12, 2007.

  1. Chris W

    Chris W Guest

    I found a web site a while back (don't have the link anymore) where they
    showed how to make your own cable to hook your GPS to the camera.
    Seems all the $100 cable does is us a $2 chip to convert the serial
    level RS-232 signals to TTL level. Well I have found a GPS that has TTL
    level output along with the serial level signals. My question is, is
    there a way to pull the power the GPS needs to run from the camera? The
    GPS spec sheet says it needs 45ma at 5V. If I can avoid making a
    battery pack for the GPS, that sure would make for a nice very small and
    simple solution to having a GPS on the camera instead of having it in
    your pocket with wires all over the place. The GPS is only 41mm square
    and I was thinking of making a hot shoe mount from some old dead flash.


    --
    Chris W
    KE5GIX

    "Protect your digital freedom and privacy, eliminate DRM,
    learn more at http://www.defectivebydesign.org/what_is_drm"

    Ham Radio Repeater Database.
    http://hrrdb.com
     
    Chris W, Nov 12, 2007
    #1
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  2. Chris W

    Richard H. Guest

    Hi, Chris.

    Yeah, that connector seems to be proprietary, and they're proud of it.
    Even the 3-wire version with only bananna-plugs on the end is expensive.

    Don't try pulling that current through the 10-pin port. There's no way
    it's rated for 45mA; if they haven't current-limited it (they should
    have) you'll damage the camera. Maybe wire to the camera battery contacts?

    Personally, I wouldn't hack on my expensive camera, and I don't like
    making the camera bigger (or adding external wires) unless it really
    needs it. Why not sync the GPS data to the pictures in post-process
    instead of real-time?

    The cheapest candidate I've found so far is the Garmin eTrek H (~$100)
    will do ~12 hours on a set of AA's and supports serial downloading with
    an add-on cable. You'd need to code the script to load the EXIF data,
    but it's about half the cost of Sony's GPS photo gadget. Haven't had
    time to hack out this project yet, but it's high on my list.

    I am curious, though - what GPS module did you find in that size?

    Cheers,
    Richard

    p.s., speaking of adding dangling wires to the camera, I find it a bit
    ironic that Nikon's D300 wireless module (WT-4a) is a brick with a cable
    to the camera. :) I thought the D200 style (in the battery grip) was a
    lot slicker.
     
    Richard H., Nov 13, 2007
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  3. Chris W

    Chris W Guest


    Here is the GPS.
    https://www.argentdata.com/catalog/product_info.php?cPath=23&products_id=23

    After further research it seems it has 3V TTL levels and the camera
    wants 5V so I will still need a converter. Also it seems this guy...

    http://forums.dpreview.com/forums/read.asp?forum=1021&message=18460359

    has powered his from the camera but it is unclear where he is getting
    the power... I think it might be from the hot shoe.





    --
    Chris W
    KE5GIX

    "Protect your digital freedom and privacy, eliminate DRM,
    learn more at http://www.defectivebydesign.org/what_is_drm"

    Ham Radio Repeater Database.
    http://hrrdb.com
     
    Chris W, Nov 13, 2007
    #3
  4. Chris,

    In case you don't already know, there's software that does the same thing.
    Check out http://www.robogeo.com
     
    Jimmy Poindexter, Nov 13, 2007
    #4
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