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RE: Finaly a cheap possible wearable solution?

cool info.. so you are wiring the meter in series
on the positive line between the converter and the
power supply?

-----Original Message-----
From: Bryan Hurley [mailto:]
Sent: Friday, February 28, 2003 10:43 AM
To: 
Subject: Re: Finaly a cheap possible wearable solution?

ok, this is how to measure power consumption

first, get the 12v input atx power supply for the eden, the nice little
one that is similiar to the ones in the cubid case.

now you have 12v in.. so you only have one voltage.. this is good.

then you have to hack the power cable from the AC/DC converter that came
with the power supply.

keep the ground going directly from the converter to the power supply.
then you have to wire in a multimeter to the positive wire.
Change the multimeter to read DC amperage, on a fluke you have two places
to put the positive plug, take out from normal one and put in the 10A
plug.. hopefully whatever multimeter you have, you can set the positive
plug to be unfused, or have a high current allowance.
Then wire the positive towards the AC/DC converter, then wire the ground
to the positive part of the plug that goes into the 12v in on the power
supply.

now when you run the system, your multimeter should give a reading on how
much current is being used, amperage... then multiply the 12v that you
know you are supplying from the AC/DC times the amperage that the
multimeter says and you get the wattage that the system is using.

make sure to boot up the system and use it and take down measurements all
the time.. this way you can see the max power usage which is often during
bootup and also see normal usages...

figured everyone might not know how to do this so I would post it.

<disclaimer>
The above explanation of how to measure voltage is for educational use
only, any usage of the above design is used at the user's own risk. there
are no warranties expressed or implied.
</disclaimer>

enjoy,
Bryan

On Thu, 27 Feb 2003, ben wrote:

> Has anyone been able to find out power consumption stats for the EPIA M
> board?  The EPIA ME6000 has a slightly beefier (but still fanless)
> 600mdz Eden processor.  It also has a supposedly better 3D processor,
> and an on-board DVD decoder.
>
> I don't technically need all of that stuff in my system, but it would be
> nice to have it, if the tradeoff isn't too bad.  My guess would be that
> the 600mhz Eden wouldn't drain much more power than the 533, but I worry
> about the extra stuff on the M board sucking up juice.  Even a few extra
> watts could have a noticeable effect on battery power.
>
> -ben
>
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> http: slightlymad.net
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