Power controlers... on another note.
Lechner at drs-esg.com
Tue Jun 4 05:11:51 PDT 2002
There was a much more extensive coverage of this (home-built UPSs) on
slashdot a few days ago -
(Search their archive - http://www.slashdot.com)
> -----Original Message-----
> From: Josh Fryman [SMTP:fryman at cc.gatech.edu]
> Sent: Tuesday, June 04, 2002 7:49 AM
> To: Carlos O'Donell Jr.
> Cc: beowulf at beowulf.org
> Subject: Re: Power controlers... on another note.
> > Are there inexpensive remote power control solutions
> > available for use beowulfers?
> for the record, you can build an equivelant for less than $10/node for
> non-bulk retail (radioshack-like) pricing, plus one small micro or another
> machine to control the setup.
> all you need is a 5A 110V DC-control relay. the way this works is
> essentially wire the relay + outlet like so:
> 110V gnd/netural ----------> to outlet
> 110V hot -----> relay -----> to outlet
> v v
> +V DC signal ___| |______ DC Gnd
> when you put a +DC signal to the relay, it will pass up to a 5A load.
> these relays cost around $4. toss in a $1 outlet, $1 worth of wire,
> and you've got a little setup that's usable. (of course, you can go
> more A's for more $. a 20A relay runs around $7.)
> for a DC control signal, you can either hijack (for a few nodes) the
> parallel port outputs, or get a $10 PIC or HC11 micro with a bunch of
> digital I/O pins that you can drive.
> it's quite straightforward.
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