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

Aaron Wood woody77 at gmail.com
Wed Apr 27 15:25:44 EDT 2016

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


On Wed, Apr 27, 2016 at 11:44 AM, Dave Taht <dave.taht at 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 at lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/cerowrt-devel
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