Battery information "N/A"

  • Hello,

    I recently purchased a Power Module v3 for a VOXL CAM. When I run "voxl-inspect-battery" I get N/A. This is also received on the web GUI and QGroundControl. I need to have this function working to fly the drone.

    To debug I've done the following steps:

    1. Used the command "voxl-i2c scan 8 400000" to see if the VOXL CAM can read any I2C devices on the power port. None showed up. I tested the command on the port with the barometric pressure sensor and the scanner is working properly as it found the device.

    2. I then used a hardware I2C scanner I have and plugged it into the Power Module v3, and it was able to discover the devices at 0x44 and 0x45. The power module appears to be functioning correctly.

    3. I wired a oscilloscope to the output of the VOXL CAM to scan the I2C port and verify the wiring and that the VOXL CAM is sending read commands. I was able to see the commands being sent and that the system is wired correctly.

    What can I do to properly setup this module? Is there anything I might be missing?

    Thank you,


  • Dev Team

    Hi @jbruell94 ,

    The I2C bus used to talk to the Power Module v3 is actually connected to the STM32F7 microcontroller (not the snapdragon) so none of the voxl-* tools are really applicable.

    Here's the PX4 driver (and as I'm writing this, yes it's a bit confusing since I called the driver in PX4 "voxlpm"....):

    The action starts here:

    The cable from the APM splits and plugs into this connector on the Flight Core mentioned above.

    Let me know if this doesn't help get you going.

  • Dev Team

    Note: ^^ none of that coding info above is needed, just for reference. The firmware on the FlightCore portion of VOXLCAM should be ready to go with nothing needed...

  • Hi ModalTB,

    I was able to resolve the issue looking deeper into QGroundControl. I had set the system to HITL after following your awesome tutorial:

    To fix this, I switched the system back to "Generic Quadcopter" in order to receive battery data.

    Thank you for your through response. It helped me to resolve this.

    Best Regards,


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