Software and Telemetry Connection

Posted by Matt Johnson on March 23, 2015 at 7:51am

Where do you plug the oDroid into the Pixhawk? is it using a telemetry port or USB?

Also, your page does not have a link where to get the 4Gmetry software once you have acquired all the necessary hardware.

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  • Volta Robots March 23, 2015 at 8:09am

    Hi Matt,
    thanks for the questions, I'll immediately integrate on the webpage so it can be useful to others.

    1) Pixhawk (telemetry port) -> serial to ethernet converter -> OdroixXU3. So you need a serial cable and a ethernet short cable.

    2)  Lubuntu OS can be downloaded dyrectly from the link. Then you have to put it on the SD Card. Speedtest-cli has a 2 step installation from terminal:     sudo apt-get install python-pip  then sudo pip install speedtest-cli . Finally you should install http://www.brokestream.com/udp_redirect.html. This is the minimu to run 4Gmetry.

    PLease ask here for other questions!






    • Wilhelm Matilainen > Volta Robots March 24, 2015 at 4:24pm
      Hello,

      Could you please explain the need of a serial to ethernet converter?
      Probably all the single board computers do have uart pins.
      All that's needed is a df13-6pin cable, cut it half, solder one half to breadboard type jumper cables and connect these to the serial (uart) pins of the board. Serial can be accessed by /dev/ttySn where n is the number of the serial port.
      I'm speaking of beaglebone black in the example, but on the odroid there's the uart connection probably on the io expansion header.

      Pixhawk --- Df13-6p --- Jumper cable male/female --- Single board computer
    • Volta Robots > Wilhelm Matilainen March 24, 2015 at 4:41pm

      Hello Wilhelm, welcome to 4Gmetry and thanks for the question.
      I'm just working to remove the converter. Yesterday I was discussing about this with Bernt: the point is that for TCP <-> UART is ok, but is not for UDP (or - more precisely - we didn't manage to use it for UDP, but probably it's possible). So if you have some suggestion you're super-welcome!
      Tnx,
      S.

    • Wilhelm Matilainen > Volta Robots March 25, 2015 at 11:56am

      I now have a solution: http://matilai.net/blog/pixhawks-serial-to-udp/

      This will connect the Pixhawk's serial to UDP, which can be used from QGroundControl.

      Again, done with socat.

    • Bernt Christian Egeland > Wilhelm Matilainen March 25, 2015 at 12:10pm
      Hi
      Can you confirm that this will work with mission planner and without errors?
    • Wilhelm Matilainen > Bernt Christian Egeland March 25, 2015 at 12:18pm

      I can not confirm anything running on Windows since I'm using Arch Linux myself.

    • Volta Robots > Wilhelm Matilainen March 25, 2015 at 12:42pm

      Hi Wilhelm so your solution is Socat? http://www.dest-unreach.org/socat/doc/README
      @Bernt this could solve the entire architecture: no converter, both UDP & TCP. 
      Thanks Wilhelm for your contribution!!! Have you already tested? Under what conditions (OS, physical port, SBC,...)?

      http://www.dest-unreach.org/socat/doc/README
    • Wilhelm Matilainen > Volta Robots March 24, 2015 at 5:23pm
      Checkout my blog if it's any use: http://matilai.net/blog
      There I describe how to connect the serial over network connection to qgc.
      In the code snippet you can change tcp to udp.
    • Bernt Christian Egeland > Wilhelm Matilainen March 25, 2015 at 12:00am

      Hi

      I previously tested several methods of streaming at UDP , but none of the metioned syntax will work when connecting directly to GPIO TX/RX.

      I tested UDP with Socat, Udp_redirect, Phyton script, ++.  TCP works without any problem.

      Please give me a scout if anyone finds a workaround for this.

    • Christian > Bernt Christian Egeland March 25, 2015 at 1:13am

      Why does ser2net not work?

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