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  • Note sure where to post? Ask questions here for direct access to the ModalAI engineering team

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    S
    I want to build a long range endurance drone (60 min flight time) for live broadcast using Sony LR1 with Gremsy gimbal. I need a continuous clean feed out of the MVX FPV Video Receiver from the Sony LR1 as well as a continuous FPV (fixe camera) feed for the pilot. Is the MVX FPV Video Receiver capable of doing this without having to switch between cameras? Or would I need two stinger vision video transmitters on board and two receivers?
  • Commonly asked questions we get from the community

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    J
    Hello. Can a Starling 2 drone autonomously fly while flying over the pipe inside a sewer? The drone must fly autonomously in a dark place to inspect cracks or internal conditions while flying along the water pipe. I'm not sure if this feature can run on Starling, so I'm asking for help!
  • Questions by Product

    Product related questions and answers

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    Noah HeinenN
    HARDWARE VOXL 2 Mini (M0104), voxl-px4 1.14.0-2.0.133 (PX4 v1.14), voxl-mavlink-server 1.4.14 Doodle Labs Smart Radio RM-1700-22M3, connected per the Doodle Labs user guide: Port 1 (USB device) -> custom harness mimicking MCBL-00080 wiring but with ADDED LENGTH (D-, D+, GND on J3 pins 2/3/4, no VBUS; unshielded discrete JST-GH wires) -> VOXL J3. Radio appears as SMSC LAN9500A bridge -> eth0 Radio powered separately: Port 4 from a 5V/5A Pololu buck (battery-fed) VOXL 2 Mini powered from the VOXL ESC's regulated output (supported config per docs) 6S pack, quad-X, VOXL 4-in-1 ESC (UART), ~40 A peak bench currents ESC firmware: as shipped (will attach voxl-esc scan output; can update from the voxl-esc repo if a newer build is recommended) SYMPTOM Every 2-5 s after arming (and reproducibly during motor transients), the USB device drops off the bus and re-enumerates. ~2.5 s network outage each time -> QGC loses telemetry, PX4 declares "Manual control lost" -> failsafe. dmesg shows a clean detach with NO preceding errors: usb 1-1: USB disconnect, device number 7 smsc95xx 1-1:1.0 eth0: unregister 'smsc95xx' ... USB 2.0 Ethernet QTI:TETHERED link down usb 1-1: new high-speed USB device number 8 using xhci-hcd smsc95xx 1-1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0x4DE1 No xhci transaction errors, no resets, no driver messages before any event. Also occasional spontaneous flaps in the first minutes after boot (motors off), often in bursts of 2-3 disconnects within seconds ("bounce storms"). KEY REPRODUCTION (no arming involved) Stepping all 4 motors 0 <-> 65% via actuator test (props off) produces 2-6 disconnects per 8 steps, every run. Holding all 4 motors at a constant 45% for 20+ s produces ZERO disconnects. So it correlates with dI/dt (current change), not current level, vibration, or the arming software path. ELIMINATED BY DIRECT TEST Software: auto suspend disabled at all levels, no USB2 LPM on this kernel, rx_parse_errors=0, MAVLink v2 both ends, logging (SDLOG) A/B tested, arming logic excluded by the actuator_test reproduction above Radio supply headroom: 2.4A regulator replaced with 5A -> no change Harness: replaced entirely -> no change (both were unshielded JST harnesses) Power lead radiation: 12AWG battery leads bundled/rerouted -> no change Mechanical: J3 connector reseat + strain relief cured an earlier wiggle-to-disconnect sensitivity, but transient-triggered flaps persist VOXL on bench supply (instead of ESC output): background flaps stopped and pulse-induced flaps dropped ~6 -> ~2 per run, but not zero CURRENT HYPOTHESES (in order) ESC input bulk capacitor: this is a 6S build and the ESC's provided capacitor is installed at the battery connector, NOT at the ESC input pads (about to move it -- per @Alex Kushleyev's note that 6S without the cap causes "excessive noise") Common-mode/ground transient across the unshielded USB harness (planning a bonded ground strap routed with the harness + snap ferrites) Residual: VOXL-side rail dip when powered from ESC aux during transients QUESTIONS Is this failure signature known on VOXL 2 (Mini) builds with higher-current ESCs? Any documented fix? Does ModalAI have a recommended ferrite / common-mode choke or shielded harness option for the J3 USB link in electrically noisy builds? Is powering VOXL 2 Mini from the ESC regulated output advisable on a 6S ~40A-transient airframe, or is the M0041-4 power module strongly preferred? Any known sensitivity of the QRB5165 USB host (xhci) to ground transients that would argue for specific layout practice? Is there a current VOXL ESC firmware release with improvements relevant to 6S electrical noise / switching behavior, and is updating recommended here? (Happy to flash latest from the voxl-esc repo if so.) Baseline parameters: for a custom 9-inch VOXL 2 Mini build, which platform file should be the starting baseline? The candidates in voxl-px4-params/params/v1.14/platforms are: VOXL_2_defaults.params VOXL_2_fpv_defaults.params M500_FCV1.params M500_FCV2.params My understanding is the M500_FCV* files target Flight Core hardware and should NOT be loaded on a VOXL 2 Mini -- can you confirm VOXL_2_defaults is the correct base for this board, plus frame-specific CA_/VOXL_ESC_ on top? USB harness between the radio and VOXL J3: ours is a custom cable that mimics the MCBL-00080 wiring but is LONGER than the stock cable (unshielded discrete JST-GH conductors, no twisted pair). Is there a maximum recommended length for the J3 USB 2.0 HS harness in a noisy airframe? Does ModalAI offer (or recommend building) a shielded and/or twisted-pair version for longer runs, and could the added length alone plausibly account for transient- induced disconnects like the above? Happy to provide full dmesg logs, ulogs, and the reproduction script.
  • 508 Topics
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    wilkinsafW
    Hey @arvind_g3aero So, it does look like you were able to get this working with the dev release of voxl-camera-server which is great to hear. The natural progression of a software package is through dev-> staging -> release. So, this version of voxl-camera-server will be released in a future SDK. There will most likely not be a backport onto the 1.6.2 SDK
  • Please request review from ModalAI before building your drone or custom add-on PCB

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    S
    Hi ModalAI team, We are planning a 7-port USB 2.0 hub for VOXL 2, connected through J3, using the Microchip USB2517. We wanted to use this to connect more sensors and USB cameras to the VOXL 2 board. I’m following the USB expansion guidance in the VOXL 2 Expansion Design Guide and wanted to ask: Do you have a reference schematic for a USB 2.0 hub connected to J3 that you could share? The guide mentions that ModalAI may review customer expansion-board designs. Once I have my schematic ready, would you be willing to review it before I proceed to PCB layout? Thank you in advance!