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

[Benjamin Tompkins]

You may be better off skipping the hub and looking for an extension cable
and putting the joint where the bend is.

As for the passive hub, USB 2.0 specifies a max amperage of 500mA.  It
should provide that to a single port if that's all that is in use.

Benjamin

On Tue., Oct. 29, 2019, 12:44 p.m. Khalid Baheyeldin, <kb at 2bits.com> wrote:

> On Tue, Oct 29, 2019 at 12:06 PM Ron Singh <ronsingh149 at gmail.com> wrote:
>
>> Khalid, I have only seen a rubberized USB A-B cable once many years ago
>> attached to a robotic device.
>>
>> In my case, if I use a short cable and a hub, the cable does not need to
> bend much, so stiffness will not be an issue anymore. The hub will be near
> the pivot point where the axes intersect.
>
> It will also simplify the cabling (one cable to the laptop instead of two).
>
> As for a passive hub being able to power 2 devices, best to get some idea
>> of the current being drawn by said devices.
>>
>
> Only one device need to be powered through USB. The other has its own
> power supply.
>
> I have a couple of in-line USB amp/voltage readers things courtesy of
>> China,
>>
>
> Oh, those. I have one stashed somewhere. Will look for it and try to get a
> baseline on current usage.
>
> Once I get this, how can I be sure that the hub would be able to supply
> that much?
>
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