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Date:      Wed, 16 May 2007 20:09:43 +0600
From:      "Aftab Jahan Subedar" <jahan@bol-online.com>
To:        wizlayer@gmail.com
Cc:        jekillen <jekillen@prodigy.net>, "FreeBSD, Questions" <freebsd-questions@freebsd.org>
Subject:   Re: Auto shutdown/restart software for FreeBSD?
Message-ID:  <da9e9eb60705160709tc4fc845m8649f693c91e3a55@mail.gmail.com>
In-Reply-To: <200705150017.14949.wizlayer@gmail.com>
References:  <23042ea705a53aea5d36bb86a06d3b4c@prodigy.net> <200705132113.15443.wizlayer@gmail.com> <c2e48020af74a457f6556ae878c8ee70@prodigy.net> <200705150017.14949.wizlayer@gmail.com>

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Thats all comes down to switching IC with bigger AMPERE or darlington
circuit.
Anyway I dunno any circuit publicly available to make one UPS using
microcontroller.
If u anyone has one, kindly post it here.

We definitely do not want to get ripped off by the UPS makers!!!

On 5/15/07, WizLayer <wizlayer@gmail.com> wrote:
>
> On Monday 14 May 2007 08:27:48 pm you wrote:
> > On May 13, 2007, at 7:13 PM, WizLayer wrote:
> > > On Sunday 13 May 2007 07:17:14 pm Aftab Jahan Subedar wrote:
> > >> Would it recharge the battery fully after discharge? I dont think so.
> > >> So you got to  recharge the external battery EXTERNALLY after power
> > >> failure.
> > >
> > > What's wrong with that?  Trickle-charge the battery and ride the
> > > computers
> > > from the battery at the same time...  That's an uninterrupted power
> > > supply.
> > > A voltage regulator, converter, and a few filters will give you a
> > > clean,
> > > constant supply.  It will last longer, and it's a lot cheaper in
> > > comparison.
> > >
> > > Actually, this is a project of mine that's been on the back burner for
> > > years
> > > now.  I'd like to add a network interface for remote controls, some
> > > health
> > > checking, and test modes, but would have to incorporate an embedded
> > > processor
> > > (serial port and/or USB interfaces are just as possible).
> > >
> > > Being that I've never messed with such, any suggestions as far as a
> > > good
> > > processor to start with?  It doesn't necessarily have to be a
> > > processor that
> > > will do the whole kit-n-kaboodle.  Right now, I'm just looking for
> > > something
> > > I can learn the basics with.
> > >
> > > I know it's not a BSD-related question, but I figured I'd ask anyway.
> > >
> > > Thanks
> > >
> > > WizLayer
> >
> > This is another approach that seems like it would be practical:
> > Use deep cycle car batteries, trickle charge with solar panels.
> > If a desktop computer can run on square wave generated by
> > dc/ac converter, use that as a power backup system, It would
> > have to have some kind of switching system to detect main
> > power drop and switch to the backup system.
> > Perhaps someone would be willing to, with engineering expertise
> > put together servers that would work on laptop batteries, like a
> > laptop. I do have one machine that has Yellow Dog linux (Mac
> > Powerbook 3400c) that runs 24/7 as my backup DNS server.
> > JK
>
> Why settle for a square wave?  It's not hard to clean that up, and
> besides...
> Wouldn't that bring mayhem and havoc on a scanner (ie, I'm pretty sure
> that
> you your screen would do very unhappy things)?  LCD screen? don't
> know.  (or
> a system's power supply over long term?  hmmm)
>
> As far as the type of batteries, deep cycle marine batteries,
> whatever.  It
> doesn't really matter except to say that some types can be fully
> discharged
> and some would be ruined on a full discharge.  The health and monitoring
> portion of the UPS would have to be designed with those limits in mind
> (and,
> hey...  That could be part of the embedded mprocessors job, too...  more
> options).
>
> Switching power from one source to another is something that I've not had
> a
> lot of  luck with, esp with sensitive stuff like a computer's power supply
> (touchy).  On the other hand clean, dc power in a parallel circuit is as
> simple as it gets.  Edison had a good idea after all.
>
> Look at the battery as your constant source, and work away from
> that.  Your
> secondary source merely compliments the battery.  So long as you use
> regulators for your "other sources", it will stay "Clean by default."  :)
>
> As far as switching power sources from regular charger to something like
> solar
> panels, same concept...  Don't switch from-to anything.  Keep it
> constantly
> hooked up in parallel with the battery.
>
> Some simple logics could perform circuits acts for the solar panels ("if
> sun
> is good and elec_co's bad , then close..."  however you want to hack it.)
> Same for dis/associating the charger.
>
> I just need someone to point me in the right direction as far as embedded
> mprocessors.  I've googled it, and found a few hobby kits, but I'd rather
> hear it from someone who deals with stuff like this and can suggest a
> "start
> here."  I hate jumping into something only to have to unlearn in order to
> learn it right.
>
> WizLayer
>
>
> PS  When I finally get this finished, I'm going to find some way of
> modifying
> the BSD license to apply it and release the whole thing to the
> public.  One
> would only have to buy the parts, program, and assemble the thing...  Why?
> Because UPS prices are a rip-off and some jerk told me I couldn't.  :)
>
> --
>
>
> Life is better with a BSD.
> For more info, www.bsd.org.
>
>
>


-- 
Aftab Jahan Subedar
CEO/Software Engineer
Subedar Technologies Ltd
Soubedar Baag Bibir Bagicha #1
North Jatra Bari
Dhaka 1204
Bangladesh

http://www.DhakaStockExchangeGame.com



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