Subcategories

• PX4 Autonomy Developer Kit

  Product related questions and answers

  13
  Topics
  102
  Posts

  A

  Hi all,

  I recently purchased the PX4 Autonomy Developer Kit and wanted to know if anyone has any resources or tips they could give me on how to control the drone with python? I would like to be able to control it using code "set take of/landing point, do a set trajectory on Qground control, or simply fly up rotate 360 and come back down". Any help would greatly be appreciated.

• VOXL Accessories

  Microhard Modems Cellular Modems Power Modules Image Sensors
  199
  Topics
  1126
  Posts

  A

  Hi @gitcoder ,

  Good question...

  You can lock the AWB (Auto White Balance) to a specific scenario / color temperature using the following options:

  https://android.googlesource.com/platform/system/media/+/master/camera/include/system/camera_metadata_tags.h#696

  You need to replace AUTO to the desired color temperature:
  https://gitlab.com/voxl-public/voxl-sdk/services/voxl-camera-server/-/blob/master/src/hal3_camera_mgr.cpp#L530

  uint8_t awbMode = ANDROID_CONTROL_AWB_MODE_AUTO;

  (will consider to add this as an option to camera server)

  I have not tested this in a while but i am pretty sure it works. Please let me know if it does not work. Is this sufficient for you or you want to fine tune each R, G, B channel and have those values fixed?

  Alex

• VOXL Compute & Autopilot

  Product related questions and answers

  VOXL 2 Mini VOXL 2 VOXL Flight VOXL Flight Core v2 Flight Core VOXL 2 IO Flight Core - ArduPilot
  816
  Topics
  4255
  Posts

  A

  @david-moro and @TomP ,

  I am curious about your requirements for digital image stabilization, since there are a few approaches, as you know some use IMU, some dont.. some support large stabilization range, others only remove shakiness (for example smartphones, which use optical and digital stabilization vs a really wide field of view camera that is able to perform stabilization in the full flight envelope).

  Also, image stabilization for FPV is different than for recording pretty videos - not only the range of motion may be different, but also latency, etc.

  It would help if you (and anyone else) let us know what (roughly) you are looking for in digital image stabilization, so that we can consider that use case as we are designing the new feature.

  As we get closer to a beta release, we will definitely welcome beta testing and feedback. Thanks!

  Alex

• VOXL Dev Kits

  Product related questions and answers

  VOXL-CAM VOXL Flight Deck
  159
  Topics
  720
  Posts

  R

  @tom It worked! I tightened the screws, and it turns out it was a hardware issue. I've installed the Tailscale VPN on both the drone and my machine, and I've completed the calibration and binding. However, I'm having trouble starting the camera; it's not turning on in VLC or QGroundControl.

• VOXL Dev Drones

  Product related questions and answers

  Starling & Starling 2 Sentinel VOXL m500 Reference Drone Qualcomm Flight RB5 5G Drone Seeker
  420
  Topics
  2221
  Posts

  E

  @smilon The parameter EKF2_REQ_SACC sets the maximum allowable speed accuracy. If you increase that value does the warning go away? Can you post a log?

• ESCs
  67
  Topics
  566
  Posts

  A

  Hi @Stefan-Amundarain ,

  Thank you for uploading the video with the detailed demonstration.

  What I see from the video is that the initial "sinusoidal" spin-up works (almost) every time, but the ESC fails to transition to regular non-sinusoidal control mode. There are typically two reasons for this:

  a bad motor / wiring / connection or one of the ESC Mosfets is not working properly. In some failures, the sinusoidal spin-up is still able to rotate the motor, but during the transition to normal operating mode, there are some checks to ensure proper motor behavior and if those checks fail, the ESC stops (and then restarts since you are commanding it to spin). The behavior i am seeing is very similar to this.

  sometimes if you have spin-up time too fast (and spin-up power too low), the ESC will lose sync with the motor during sinusoidal spin-up. I would suggest trying to (you can do both changes at once):

  increase the spin-up time (double it from what you have now) increase the spin-up power by 20% (if it is 100 (which is 10% power), set it to 120, so it will be 12% power). also double check that the motor kV is set correctly, because it is used during sinusoidal spin-up for back-emf compensation.

  I would also suggest swapping out the motor for an identical new motor, so you can eliminate the motor being an issue. You can also check the motor winding resistance to make sure all 3 possible pair-wise resistance measurements have the same resistance.

  Finally, if all of these steps fail, please try to use another ESC channel to see if it is a dead ESC channel (which should be unlikely).

  Please try these out and let me know what you find!

  Alex