@nickanick , can you please clarify which exact WIFI Dongle you would like to use?

@j-angel ,

We had a small batch of color AR0144, but those have run out and due to low demand, we do not have any stock.

I would like to clarify something. Motion blur is present when using any camera (global shutter or rolling shutter). Global shutter cameras also have exposure control and long exposure times will cause motion blur.

I think what you may be referring to, which is different in rolling shutter cameras (compared to global shutter), is the rolling shutter skew. Rolling shutter cameras use a technique where the start of exposure of each image row is offset slightly, so each row is essentially exposed over a different time frame. The offset is usually very small (4-30 microseconds per line, depends on the camera, mode), but from top to bottom, the rolling shutter effect can add up and be visible when there are moving features in the scene.

The fastest rolling shutter camera we have right now is IMX412 and in the 2x2 binning mode, the 1920x1080 resolution, the total frame readout time is 4ms. (https://docs.modalai.com/camera-video/low-latency-video-streaming/#camera-pipeline-latency-in-different-operating-modes). This means that the difference of the center of exposure between the first and last image row is 4ms.

Considering the information above, 4ms can seem a lot, but keep in mind that is the time delay across the whole image. depending on the size of features, the rolling shutter effect across a smaller image area will be smaller. Using the height of 1080, we can compute the time offset for each line, 4ms / 1080 ~ 4us.

Depending on the size of features that are being tracked, the rolling shutter may not create a lot of local skew. Additionally, the camera timing is deterministic, so it is possible to calculate the time offset of the center of exposure of each line (with respect to the first line). If you want to provide some more details on type of perception, I could provide more guidance.

Unfortunately, right now, we do not have a color global shutter camera option.

Alex

@jon You can use a J19 UART from the apps processor. Take a look at the code in voxl-elrs (https://gitlab.com/voxl-public/voxl-sdk/utilities/voxl-elrs/-/tree/dev?ref_type=heads), specifically the file src/elrs_slpi.c. This project accesses SLPI UARTs from an AP userspace process through voxl_io, not through POSIX termios. You cannot have a flight controller running at the same time though so PX4 / ArduPilot / etc. would need to be stopped first.

@Michael-Hatton Yes, you need to have a separate battery charger. I'll see if I can get a recommendation from the team on a good charger to use. I use a Hota D6 Pro, personally.

@Michael-Hatton Did you run through the voxl-configure-modem setup in order to configure APN, etc?

https://docs.modalai.com/voxl-modem/#usage

@wilkinsaf You can disable compass with SYS_HAS_MAG = 0 and EKF2_MAG_TYPE = 5. But if you enable it and it isn't healthy you won't be able to arm. Power compensation may work, it depends on your particular drone model and use case.

@jbiscan21 said in Standoffs part:

standoffs

You can find them here: https://www.modalai.com/products/starling-2-max-replacement-parts?variant=66893548028208

@Barry-Hammond https://docs.modalai.com/voxl-streamer/#how-to-stream-video-with-rtsp-on-voxl

Quality greatly depends on your LTE coverage and VPN performance. I recommend lowering the bitrate in /etc/modalai/voxl-streamer.conf until you're happy with the response rate.

Tailscale can add overhead as well and our recent LTE testing has involved hosting a custom WireGuard server.

@Michael-Hatton When you arm the drone it is in flight mode and the motors start to spin. It's that spinning of the motors that you don't want while plugged into a power supply. Only use your battery to actually spin the motors and fly.

@Jskim This is the repo we use for support of UVC cameras: https://gitlab.com/voxl-public/voxl-sdk/services/voxl-uvc-server. I don't think it will work directly with Seek cameras but you can try. In my experience each new camera requires a bit of integration work and updates to that code.