<div dir="ltr">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).<div><br></div><div>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.</div><div><br></div><div>-Aaron</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Apr 27, 2016 at 11:44 AM, Dave Taht <span dir="ltr"><<a href="mailto:dave.taht@gmail.com" target="_blank">dave.taht@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I am curious if there would be a way to use a powered usb3 hub to<br>
individually be able to address and power cycle the ports individually<br>
on it?<br>
<br>
I have accumulated enough hackerboards powered via usb that it would<br>
make sense to just power them all that way... kind of like I already<br>
do with these:<br>
<br>
<a href="http://www.digital-loggers.com/lpc.html" rel="noreferrer" target="_blank">http://www.digital-loggers.com/lpc.html</a><br>
<br>
and just use that (rather than an individual power supply for each).<br>
<br>
I am perpetually locking one up or losing connectivity to it for some<br>
reason or another.<br>
<br>
I figure somewhere in the usb spec/protocol/device driver/whatever<br>
there would be a simple command to just flip the power on and off to<br>
the port....<br>
<span class="HOEnZb"><font color="#888888"><br>
--<br>
Dave Täht<br>
Let's go make home routers and wifi faster! With better software!<br>
<a href="http://blog.cerowrt.org" rel="noreferrer" target="_blank">http://blog.cerowrt.org</a><br>
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