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One GPS/Compass for Pixhawk & APM?

Posted by Mikael Mattsson on July 22, 2015 at 9:50am
Hi!

Is it possible to connect a 3DR Ublox 6 GPS/Compass to both a 3DR Pixhawk and a 3DR APM 2.6 using GPS and Compass for both controllers?

Like this:

Compass:
- All GND together (pin 4's)
- All SCL together (pin 3's)
- All SDA together (pin 2's)
- +3.3V (pin 1) from either Pixhawk or APM to Compass

GPS:
- All GND together (pin 6's and 5 om APM)
- Tx from GPS to both Rx on Pixhawk and APM
- Tx from Pixhawk and APM to Rx on GPS
- Vcc +5V (pin 1) from either Pixhawk or APM to Compass

Or will any signal (SCL/SDA/Tx/Rx) freak out because there are two talking?
3DR said its not a setup to be recommended.

/MickeM

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Replies

  • Erich Freymann August 10, 2015 at 11:19am

    http://www.rcgroups.com/forums/showpost.php?p=30692474&postcoun...

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    • Mikael Mattsson > Erich Freymann August 13, 2015 at 1:49am

      Yes, I got that link from Adam att BEV, but i didnt get exactly how to connect it 100% with that explanation. But I suppose its the same as I suggested.

      I will use the GPS for both APM 2.6 and the Pixhawk. The Compass, only for the APM (since it will fly after WPs).

  • Andre K. July 27, 2015 at 5:21am

    you could share GPS by only attaching it's RX to one controller.

    but you cannot paralell two I2C masters like that.

    • Mikael Mattsson > Andre K. July 28, 2015 at 5:47am

      GPS...

      Ok, should I use the RX on the GPS-unit at all?

      TX from GPS -> both controllers RX

      TX from any controller to GPS?

      Compass...

      Ok, will use the compass for one controller only then (APM), guess the Pixhawk would work without Compass?

      Im using this setup for a FireFLY6.

      Pixhawk for hovering and APM for WayPoint-flying.

      • Andre K. > Mikael Mattsson July 28, 2015 at 10:30am

        GPS RX is used only for configuration of GPS,  depending on GPS type/config you may not need it.

        What is OpenVTOL ?  :)

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