Power controlers... on another note.

Lechner, David Lechner at drs-esg.com
Tue Jun 4 05:11:51 PDT 2002

FYI - 
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)
R/ Dave.

> -----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.
> -josh
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