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  4. Getting compass to work from the Here 2 GPS

Getting compass to work from the Here 2 GPS

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  • R Offline
    R Offline
    restore
    Regular
    wrote on last edited by
    #1

    We have the VOXL2 and a Here 2 GPS plugged into J19. We are getting GPS data, but not seeing compass/mag.

    The Here 2 has a ICM20948 9-Axis MEMS.

    Is it possible to configure the px4 start script to use the compass from the ICM20948?

    Alex KushleyevA 1 Reply Last reply
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    • R restore

      We have the VOXL2 and a Here 2 GPS plugged into J19. We are getting GPS data, but not seeing compass/mag.

      The Here 2 has a ICM20948 9-Axis MEMS.

      Is it possible to configure the px4 start script to use the compass from the ICM20948?

      Alex KushleyevA Offline
      Alex KushleyevA Offline
      Alex Kushleyev
      ModalAI Team
      wrote on last edited by Alex Kushleyev
      #2

      @restore, it looks like PX4 does have a driver for this imu/compass.

      Link Preview Image
      px4-firmware/src/drivers/imu/invensense/icm20948/ICM20948.cpp at voxl-dev · modalai/px4-firmware

      PX4 Autopilot Software. Contribute to modalai/px4-firmware development by creating an account on GitHub.

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      GitHub (github.com)

      However, it is not clear whether you can read just compass data. Please take a look at this driver.

      If you want to use it, you will need to enable building of the driver in the voxl2 board config: https://github.com/modalai/px4-firmware/blob/voxl-dev/boards/modalai/voxl2-slpi/default.px4board : enable DRIVERS_IMU_INVENSENSE_ICM20948=y .

      Then, modify /usr/bin/voxl-px4-start to include:

      qshell icm20948 start
      

      We have not tested this driver, so we cannot really provide any guidance on using it for your application. However, with the above instructions, you should be able to compile it and run it.

      Please make sure that the IMU data from this module does not conflict with the main flight IMU.

      Alex

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