[plug] Re: UPS monitor HomeBrand?

[Mungo TheB]

>From: Shayne O'Neill <shayne at guild.murdoch.edu.au>
>Reply-To: plug at plug.linux.org.au
>To: plug at plug.linux.org.au
>Subject: Re: UPS monitor (was: Re: Shayne's Guild clock [was: Re: [plug] 
>usb2woody])
>Date: Sun, 16 May 2004 22:10:30 +0800 (WST)
>
>
>yeah. I've been contemplating building a little device out of a basic
>stamp and some relays or something.
>
>might be cheaper just to get a modern nifty shoebox ups.
>
>------------------------------------
>"Must not Sleep! Must warn others!"
>-Aesop.
>Shayne O'Neill. Indymedia. Fun.
>http://www.perthimc.asn.au
>
>On Sat, 15 May 2004, Harry wrote:
>
> > On Sat, 15 May 2004 21:28:20 +0800 (WST) "Shayne O'Neill"
> > <shayne at guild.murdoch.edu.au> wrote:
> >
> > > yeah. thats exactly what happens. :(
> > >
> > > its actually on a ups, but murdoch uni seems to get some unholy long
> > > poqwe outs and its a funky old ups that doesnt have any warning system
> > > for the server.
> >
> > Hi Shayne
> >
> > Here's an idea. How about plugging a simple interface into the same 
>power
> > point as feeds the UPS. This sends a signal to the server (lowers DTR on 
>a
> > serial port or something) when the power goes away. If you know how long
> > the UPS normally lasts, just write a little app that watches the DTR 
>line.
> > When it drops, run a timer to keep the server up for maybe 75% of UPS 
>run
> > time then elegantly shut it down.
> >
> > The interface could be as simple as a DC plug pack connected to a relay
> > with the relay contacts wired across the CTS and DTR pins (and 
>appropriate
> > driver calls to raise one and monitor the other). A small relay may fit
> > inside a DB25 cover. Electrical isolation using a relay is also 
>Good(tm).
> >
> > Or use the UCC door sense method. The switch (or relay contact) is 
>between
> > the transmit and receive pins of the serial port. If you send a char and 
>it
> > doesn't return, the relay is open which means the power has gone off.
> >
> > It'd be fun and has the added bonus that PLUGers will stop going on and
> > on (and on .. ) about times on your email ;-)
> >
> > Harry
> >
> > --
> > Are you a computer angel?	http://www.computerangels.org.au/
> > _______________________________________________
> > PLUG discussion list: plug at plug.linux.org.au
> > http://mail.plug.linux.org.au/cgi-bin/mailman/listinfo/plug
> > Committee e-mail: committee at plug.linux.org.au
> >
>
>_______________________________________________
>PLUG discussion list: plug at plug.linux.org.au
>http://mail.plug.linux.org.au/cgi-bin/mailman/listinfo/plug
>Committee e-mail: committee at plug.linux.org.au

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