Power controlers... on another note.
fryman at cc.gatech.edu
Tue Jun 4 04:49:20 PDT 2002
> 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 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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