[Nut-upsuser] 24V DC ATX PSU with limited UPS functionality over USB

[Michelle Konzack]

Hi again,

Am 2008-03-13 19:27:27, schrieb Charles Lepple:
> On Thu, Mar 13, 2008 at 5:50 PM, Jean Delvare <khali at linux-fr.org> wrote:
> >  Given that you are working on a PSU and not a UPS,
> 
> I guess it depends on which part of the "limited UPS functionality"
> Michelle is referring to.
> 
> If the PSU signals to the PC that it is time to shut down due to lack
> of reserve power, then it might benefit from NUT's existing
> infrastructure (granted, the "N" in NUT is often extra baggage...)

You have gotten it.  I like to be able to shutdown the computer (or let
it sleeping) if the Uin is less then a user specified value...

But currently I do not know, HOW I can wakeup the computer...

But since the +5Vsb (from the ATX PSU) is permanent powered the computer
must whatch the USB port to wake up...  But I do not know, HOW to send
such signal from my PSU-µC over the USB-Port...

Not found the specs for it.  Can you help me out?

> If you have a specific motherboard in mind, this is probably a good
> plan, but not all motherboards with I2C make the bus available to
> external devices.

Are there some?

> Another advantage of going the HID PDC route (regardless of whether
> NUT is involved) is that the device is essentially self-describing. If
> the first version does not have a shutdown flag, but later versions
> do, then very little driver code needs to change - just device
> firmware.

This, what I was thinking about...  With a small µC in the PSU and a
firmware upgrade plus the right UPS-Software, it would be very easy.

> Also, I believe that GNOME has a power monitor that works with HID PDC
> devices out-of-the-box, which would be another bonus feature if you go
> down the USB route.

Where can I get more infos about the HID PDC devices?

Thanks, Greetings and nice Day
    Michelle Konzack
    Systemadministrator
    24V Electronic Engineer
    Tamay Dogan Network
    Debian GNU/Linux Consultant


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