Replies

  • It does sound like you need to reach out to 3DR.

    With a miswired cable, that could have been the root cause of all your issues.

    BTW you don't need to solder those little JST connectors. You can unlock the pins from the housing and move them as necessary.

    I received an incorrect cable from 3DR for my external GPS/mag once. It has two different connectors! I had enough spare cables that I was able to fix the issue.

    -=Doug

    • The APM2.6 External GPS/Mag has 2 different cables; a 4-pin JST-SH for the Mag function, and a 5-pin to 6-Pin JST-SH for the GPS. Unless you got one with 0.100" pin plugs on one end; that would be for MultiWii. Or pre-Mega ArduPilot, I think.

      mnem

      *MOOP*

  • I got my new 3DR magnetometer and hooked it up and it didn't work!  Then I realized that I had wires the 4 pin molex connecter exactly BACKWARDS!

    Some quick soldering fixed the problem.  But it will take more than that to fix my broken ego!!! haha!

    I have yet to hook up the gy-271 but I imagine it wasn't working because of the wiring issue since I was using the same molex connector.  I'll post once I have results.


    Now I'm having to deal with a brand new DEAD APM 2.6!  Dear 3DR, I need an RMA ASAP!

    • Alright... since some of my other APM goodies have already arrived, I decided to take a chance on Paul and ordered one of these in hopes it'll get here sooner:

      http://witespyquad.gostorego.com/ublox-6m-gps-w-mounting-backplane....

      It looks like a no-brainer, especially if it really does come with a rev 2 UBlox module as stated at the bottom of the page. Hopefully I can install it far enough back in the fuse that it will be unaffected by the magnetic door catches and large (55-ish Amp) power system.

      mnem

      *Crosses claws, fingers, toes & tail*

  • Moderator

    I'm using the daughter board from a damaged APM2.0 on an APM2.5 and it seems to work fine.

    3701685626?profile=original

    • I find myself researching this issue again due to issues on my Cub build with magnetic catches on the door which are sure to interfere.

      It looks like the APM itself and the 3DR module both use a PCA9306 level translator, which "allows bidirectional voltage translations between 1.0 V and 5 V without the use of a direction pin". As you can see, the I2C bus on the APM does not have this.

      The GY-271 DOES have a Level-Translator built-in;  the GY-273 doesn't. On the other hand, this:

      http://www.ebay.com/itm/280875023000

      is the same module as the SparkFun module which was used successfully here:

      http://diydrones.com/m/blogpost?id=705844%3ABlogPost%3A1404376&...

      which has no level translation and no direction pin.

      However, Quadzimodo posts in that thread links to a GY-271 and a GY-273 and states they both work. Confused yet? Me too. I find myself wondering why the devs put in a level translator when all the intended applications only use 3.3V anyways.

      But Stefan on that thread states he's used the HMC5983 successfully:

      http://www.ebay.com/itm/141084521401

      And that it's an upgrade part; both better sensitivity and better interference rejection.

      I'm going to try the HMC5983, since as an added bonus it's also SPI bus compatible. I'm pretty sure I can find a use for it SOMEWHERE.

      mnem

      :-?

      • Followup:

        I've also ordered one of these to see if it can be made to work:

        http://www.ebay.com/itm/270964707098

        Because, as iskess says "Not much of a risk if it can't.". ;)

        • I feel very fortunate to have a brain like yours leading the way to figuring this out. Looking forward to your findings.
          Thank you for all your recent contributions to the community. I've enjoyed all your thoughtful and intelligent posts.
          • Dude... I'm just a detective with a flashlight on most of this... I KNOW there are many folks who have a lot more experience than I. But I AM more patient than many... I like to think that's my saving grace. ;)

            PK

  • I ordered this one for $2.
    http://bit.ly/Oi6fxJ
    I'm watching this thread to see if it can be made to work.
    Not much of a risk if it can't.
    eBay
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