[kwlug-disc] USB 2.0 hubs, and power ...

[Ron Singh]

Khalid, I have only seen a rubberized USB A-B cable once many years ago
attached to a robotic device. Haven't seen one recently. A quick search
around shows nothing like what I saw some years back. I wonder, will this
be good enough --
https://www.amazon.ca/GHWL-Printer-Scanner-Gold-Plated-Braided/dp/B076S38FKS/
It can be had in 6/10/15/25ft lengths.

As for a passive hub being able to power 2 devices, best to get some idea
of the current being drawn by said devices.
I have a couple of in-line USB amp/voltage readers things courtesy of
China, I can drop one in your mailbox on my 3x/wk pilgrimage to your neck
of the woods. My next visit is around 2:30PM on Wednesday this week. This
device wil give you a fairly accurate reading of current being drawn and
voltage at the devices at the end of the USB cable run.

Thanks,

Ron Singh



On Mon, Oct 28, 2019 at 11:26 PM Khalid Baheyeldin <kb at 2bits.com> wrote:

> I have an astro camera that is USB 2.0. It is powered through its USB
> cable which is also used to get images from it.
>
> The issue I am facing is the cable stiffness as the night cools down, and
> that it is barely as long as it needs to be (no slack). It is a regular
> printer USB cable (A on one side and B on the other), but somewhat long (~
> 2 metres).
>
> I want to use a shorter and less stiff cable by plugging that camera, as
> well as the other camera, into a USB hub that is closer to them, than to
> the laptop, and use an extension USB cable for the rest of the journey.
>
> The question is: will a passive unpowered USB 2.0 hub work and provide
> power to that one camera (the other camera has its own power, so power to
> it is not an issue)?
>
> I'd rather use an unpowered hub to avoid having yet another power cable
> going to yet another device.
>
> --
> Khalid M. Baheyeldin
> 2bits.com, Inc.
> Fast Reliable Drupal
> Drupal performance optimization, hosting and consulting.
> "Sooner or later, this combustible mixture of ignorance and power is going
> to blow up in our faces." -- Dr. Carl Sagan
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