[Cerowrt-devel] using a usb3 hub as a hackerboard power switch?

[Cerowrt-devel] using a usb3 hub as a hackerboard power switch?

[Dave Taht]

I am curious if there would be a way to use a powered usb3 hub to
individually be able to address and power cycle the ports individually
on it?

I have accumulated enough hackerboards powered via usb that it would
make sense to just power them all that way... kind of like I already
do with these:

http://www.digital-loggers.com/lpc.html

and just use that (rather than an individual power supply for each).

 I am perpetually locking one up or losing connectivity to it for some
reason or another.

I figure somewhere in the usb spec/protocol/device driver/whatever
there would be a simple command to just flip the power on and off to
the port....

-- 
Dave Täht
Let's go make home routers and wifi faster! With better software!
http://blog.cerowrt.org

Re: [Cerowrt-devel] using a usb3 hub as a hackerboard power switch?

[Aaron Wood]

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Most USB hub chips I've seen don't have individual lines per-port.  Instead
they monitor the +5VDC rail for powering all USB devices, and grant
requests to use power based on a configured power budget (how many amps the
supply can push).

To hack it, I'd use a Pi with it's relay modules and cut the traces to the
port, and then splice in a relay from the module (normally closed side of
the relay).  Then when you need to power-cycle, tell the Pi to cycle output
X.

-Aaron

On Wed, Apr 27, 2016 at 11:44 AM, Dave Taht <dave.taht@gmail.com> wrote:

> I am curious if there would be a way to use a powered usb3 hub to
> individually be able to address and power cycle the ports individually
> on it?
>
> I have accumulated enough hackerboards powered via usb that it would
> make sense to just power them all that way... kind of like I already
> do with these:
>
> http://www.digital-loggers.com/lpc.html
>
> and just use that (rather than an individual power supply for each).
>
>  I am perpetually locking one up or losing connectivity to it for some
> reason or another.
>
> I figure somewhere in the usb spec/protocol/device driver/whatever
> there would be a simple command to just flip the power on and off to
> the port....
>
> --
> Dave Täht
> Let's go make home routers and wifi faster! With better software!
> http://blog.cerowrt.org
> _______________________________________________
> Cerowrt-devel mailing list
> Cerowrt-devel@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/cerowrt-devel
>

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Re: [Cerowrt-devel] using a usb3 hub as a hackerboard power switch?

[Toke Høiland-Jørgensen]

Dave Taht <dave.taht@gmail.com> writes:

> I am curious if there would be a way to use a powered usb3 hub to
> individually be able to address and power cycle the ports individually
> on it?

https://www.yepkit.com/ has one of these - USB2 only, though, but there
are specs available...

-Toke

Re: [Cerowrt-devel] using a usb3 hub as a hackerboard power switch?

[Dave Taht]

On Fri, Apr 29, 2016 at 2:54 AM, Toke Høiland-Jørgensen <toke@toke.dk> wrote:
> Dave Taht <dave.taht@gmail.com> writes:
>
>> I am curious if there would be a way to use a powered usb3 hub to
>> individually be able to address and power cycle the ports individually
>> on it?
>
> https://www.yepkit.com/ has one of these - USB2 only, though, but there
> are specs available...

That would be a start, but insufficient power and not enough ports.

with the upcoming USB-C standard I suspect someone will twig as to the
usefulness of having a on/off switch on each port that can be
automagically controlled.....

>
> -Toke



-- 
Dave Täht
Let's go make home routers and wifi faster! With better software!
http://blog.cerowrt.org