Skip to content

General Questions

2.2k Topics 11.3k Posts

Not sure where your question goes? Ask here. ModalAI engineers and the community answer questions about any VOXL product.

  • Odd conditions resulting in voxl-camera-server crash

    Unsolved
    4
    0 Votes
    4 Posts
    804 Views
    H
    @Thomas-Patton thanks for looking into this. The random crash that I described in my second message in this thread is not related to the OS on which I run putty on. The crash happens on the VOXL2, sometimes even before I SSH in.
  • Support for Ubuntu 22.04

    Unsolved
    4
    0 Votes
    4 Posts
    663 Views
    Eric KatzfeyE
    @Praveen We provide the docker image so that you do not have to build it. It is just a tool that is needed to build some of our software packages. As long as it is doing that then there is no need to update it.
  • Voxl-tflite-server error with a custom model

    Unsolved
    2
    1
    1 Votes
    2 Posts
    628 Views
    P
    @Maxim-Temp hi, I'm facing the same issue, did you manage to solve this?
  • Propeller Coefficients for Starling V2

    Unsolved starlingv2 propellers
    2
    0 Votes
    2 Posts
    2k Views
    Alex KushleyevA
    Hello @Kashish-Garg-0 we have a curve that is "motor voltage vs rpm", meaning that for a desired RPM, it tells the ESC what average motor voltage should be applied. The average motor voltage is defined as battery_voltage * motor_pmw_duty_cycle. The battery voltage in this curve is in millivolts. Since you are typically controlling the desired RPM, as a user you do not need to worry about what "throttle" or voltage to apply - the ESC does this automatically in order to achieve the desired RPM. this calibration curve is used as a feed-forward term in the RPM controller. The ESC does support an "open loop" type of control where you specify the power from 0 to 100%, which is similar to a standard ESC, but PX4 does not use that ESC control mode. By the way, you can test the ESC directly (not using PX4) using our voxl-esc tools (https://gitlab.com/voxl-public/voxl-sdk/utilities/voxl-esc/-/tree/master/voxl-esc-tools) which works directly on VOXL2 or a standalone linux PC (or mac). voxl-esc-spin.py has a --power argument where you specify the power from 0 to 100, which translates directly to the average duty cycle applied to the motor. Here is the calibration for the Starling V2 motor / propeller that we use: https://gitlab.com/voxl-public/voxl-sdk/utilities/voxl-esc/-/blob/master/voxl-esc-params/mavic_mini_2/mavic_mini_2.xml?ref_type=heads#L63 Also, you can take a look at this post to see how to interpret those parameters a0, a1, a2 : https://forum.modalai.com/topic/2522/esc-calibration/2 We also have some dyno tests for this motor / propeller : https://gitlab.com/voxl-public/flight-core-px4/dyno_data/-/blob/master/data/mavic_mini2_timing_test/mavic_mini2_modal_esc_pusher_7.4V_timing0.csv . We are not sure how accurate that is, but it can be used as a starting point. @James-Strawson can you please confirm that is the correct dyno data for the Starling V2 motors? Alex
  • Latency bug in voxl-mavlink-server

    Unsolved
    6
    0 Votes
    6 Posts
    1k Views
    H
    @Eric-Katzfey thanks for the 2 fixes in a single package! Will try it out and report back tmr
  • GPS Issues w/ VOXL 2 PX4 (M8N and Here+)

    Unsolved
    4
    0 Votes
    4 Posts
    1k Views
    Eric KatzfeyE
    @majjam Okay, so I'm guessing that you are using 0.9.5 then? The only known issue with those Holybro GPS units was the baudrate thing. Some units are not set at 115200 so the command to start the gps with that baudrate will fail on units with a different baudrate setting. Changing the start line to remove the forced 115200 and let the driver choose the correct baudrate on it's own was the resolution of that issue. Beyond that we are not aware of any other issues. Can you verify that the M8N unit is working on another platform? Can you use an oscilloscope on the M8N UART TX line and see any activity?
  • VOXL1 and VOXL2 hardware fitting on m500 drone

    Unsolved
    7
    0 Votes
    7 Posts
    493 Views
    Darshit DesaiD
    @Vinny @wilkinsaf Thank you for your responses. This clarifies a lot of my questions.
  • Voxl-streamer rotation

    Unsolved
    20
    0 Votes
    20 Posts
    4k Views
    ?
    @hmlow Glad it worked! For future reference, the imx214_flip driver should be available internally from SDK 1.1 (system image 1.7) onwards. Rather than downloading from the above links, after SDK 1.1 is released the procedure will be as follows: rm /usr/lib/camera/com.qti.sensormodule.imx214_3.bin cp /usr/share/modalai/chi-cdk/imx214-flip/com.qti.sensormodule.imx214_flip_3.bin /usr/lib/camera
  • VOXL no ADB access

    Unsolved
    8
    0 Votes
    8 Posts
    2k Views
    tomT
    @SHofmeester Another thing I just thought to try:: run sudo dmesg -wH and see if you see the VOXL enumerate when you plug it in to your machine
  • This topic is deleted!

    1
    2
    0 Votes
    1 Posts
    26 Views
    No one has replied
  • mesh, rc, controller

    Unsolved
    4
    0 Votes
    4 Posts
    527 Views
    tomT
    @omer You can do joystick control w/ QGroundControl
  • OV9782 tracking configuration

    Unsolved
    8
    0 Votes
    8 Posts
    2k Views
    ?
    @david-moro Awesome! Glad we were able to get this resolved Thinking about it more, this makes a lot of sense. A higher resolution camera is going to be ultra-precise in its pixel-to-world mapping meaning small inaccuracies in the grid would probably cause the model to blow up. I'll make a note to make this very clear on our documentation. Don't hesitate to reach out if you have any other questions. Best of luck!! Thomas
  • obstacle avodiance in the dark

    Unsolved
    1
    0 Votes
    1 Posts
    291 Views
    No one has replied
  • This topic is deleted!

    1
    2
    0 Votes
    1 Posts
    3 Views
    No one has replied
  • This topic is deleted!

    5
    0 Votes
    5 Posts
    94 Views
  • How to flash new image for VOXL 2 Flight Deck?

    Unsolved
    3
    0 Votes
    3 Posts
    824 Views
    C
    @tom Awesome! Thank you for your fast reply! I appreciate it.
  • RC Missing parameters on Sentinel

    Unsolved
    9
    1
    0 Votes
    9 Posts
    2k Views
    M
    @Eric-Katzfey okey, tomorrow I will try to set up a local network with a router and I will let you know!
  • ESC acting weird

    Unsolved
    1
    0 Votes
    1 Posts
    404 Views
    No one has replied
  • Flight electronics with Voxl2

    Unsolved
    6
    0 Votes
    6 Posts
    1k Views
    VinnyV
    Apologies @vipul-kadam The forum has been finicky with me lately This is the link that was supposed to be posted. https://docs.modalai.com/sentinel-functional-description/
  • No connection between Microhard modems

    Unsolved
    7
    3
    0 Votes
    7 Posts
    2k Views
    R
    @tom I turned off the encryption on the modem that I can access, but I did not see any changes. I will also contact Microhard about this issue.