Pixhawk 2.1 - issue with I2C2 port

Posted by Simon L. on June 11, 2017 at 11:39am

I have been trying to get my digital airspeed sensor to work and while doing some research I came across this post that claims that the "I2C2" port on the PX2.1 does not work:

http://discuss.ardupilot.org/t/pixhawk-2-1-with-maxbotic-i2cxl-maxsonar-ez-issues/15613/12

The proposed solution is to connect the device on I2C1 (on the GPS1 port). Has anyone else encountered this issue ?

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Replies

  • DougB June 12, 2017 at 1:53pm

    I now have it working. I was under the incorrect assumption that the aispeed sensor static port was also providing barometric altitude data to the Pixhawk. But, the instructions say to set the ARSPD_BUS = 1, I can only make it work on ARSPB_BUS = 0 rather than what the instructions say. This is on a Pixhawk 2.1

  • Simon L. June 11, 2017 at 2:33pm

    I'm using the eagletree v3 sensor BTW

  • DougB June 11, 2017 at 2:04pm

    I was just looking at the Libraries and the airspeed library has the driver for the MS5525 airspeed sensor but the Baro library doesn't have a driver for the MS5525. It's been a very long time since I was working with the development but I think that is why I'm seeing airspeed but no altitude.

    I haven't looked at voltage and current since I just upgraded yesterday in hopes that the airspeed sensor would work

  • Simon L. June 11, 2017 at 1:44pm

    I've updated the FW to 3.8.0 beta5 and I can now see the ARSPD_BUS parameter but The "Enable" option is blacked out for airspeed whatever bus number I put.. also, The current sensor does not work properly with this version.. It seems like the current is multiplied by +- 1000.

  • Simon L. June 11, 2017 at 1:23pm

    1 - I suppose that means that the "I2C2" port on the carrier board is in fact I2C3 ?

    2 - I'm on 3.7.1..   will update  oups..

    DougB said:

    1). I just confirmed that GPS2 uses I2C-2

    2). I'm running arduplane 3.8.0rc5

  • DougB June 11, 2017 at 1:17pm

    1). I just confirmed that GPS2 uses I2C-2

    2). I'm running arduplane 3.8.0rc5

  • Simon L. June 11, 2017 at 1:09pm

    3702381228?profile=original

    It's not in the list ??!!??

  • DougB June 11, 2017 at 12:55pm

    Its ARSPD_BUS

  • Simon L. June 11, 2017 at 12:48pm

    cant find the parameter: I'm searching in the "full parameter list" ..  what is the mavelink name for the parameter you are talking about or do I need to change this through some other mechanism?

    DougB said:

    Simon, try changing the I2C bus from 1 to 0 in the parameter config file, I just did that and the airspeed seems to be working

  • DougB June 11, 2017 at 12:32pm

    Simon, try changing the I2C bus from 1 to 0 in the parameter config file, I just did that and the airspeed seems to be working

    Edit: But Altitude isn't

This reply was deleted.