RE: Switching on/off 5V power to a USB port

From: Devin Teske <devin.teske_at_fisglobal.com>
Date: Tue, 3 Apr 2012 15:45:39 -0700
> -----Original Message-----
> From: owner-freebsd-current_at_freebsd.org [mailto:owner-freebsd-
> current_at_freebsd.org] On Behalf Of Ron McDowell
> Sent: Tuesday, April 03, 2012 3:14 PM
> To: freebsd-current
> Subject: Switching on/off 5V power to a USB port
> 
> I just got a little USB powered fan and it sure would be nice if I could
> have cron on my FreeBSD box turn it on or off at certain times by
> switching off the 5V line on a USB port.  Anyone know how I can do
> that?  Thanks.

Alternatively, you could just plug your USB fan into your monitor.

A fellow engineer and I discovered that most monitors power-down the USB ports
when entering power-save mode (with Dell, HP, and Viewsonic, this is whenever
the screen blanks due to inactivity; are you using DPMS and/or greensaver?).

Walking away from the PC will cause the fan to [eventually] turn off, while
waggling the mouse brings it back to life.


> BTW this is a pretty decent fan for the money. :)
> http://www.amazon.com/gp/product/B0033WSDOM/

We didn't have a USB powered fan, so we actually wired an internal case-fan to
the 5V lead and went that route. Nice fan though.
-- 
Devin

_____________
The information contained in this message is proprietary and/or confidential. If you are not the intended recipient, please: (i) delete the message and all copies; (ii) do not disclose, distribute or use the message in any manner; and (iii) notify the sender immediately. In addition, please be aware that any message addressed to our domain is subject to archiving and review by persons other than the intended recipient. Thank you.
Received on Tue Apr 03 2012 - 20:45:40 UTC

This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:40:25 UTC