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

[Benjamin Tompkins]

Are you only powering the device via USB?  Or do you need the data
connection as well?

If just power, why not a small power bank instead of the cable?

Benjamin

On Tue., Oct. 29, 2019, 12:56 p.m. Benjamin Tompkins, <bjtompkins at gmail.com>
wrote:

> 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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>
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