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'power usage meter?'
1997\12\10@095951 by rustyc

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Ok, I've got a question - I want to build a device which keeps track of how
much energy a power-line-connected device (AC, Freezer, light, fan, whatever)
draws over the period of a day or week or month or ...

I had figured to use the toroid method mentioned earlier for measuring current,
with some other means of measuring voltage (just to be complete and slightly
more accurate - shucks, I could even compute power factor if I can get 'near-
instantaneous' voltage and current measurements).

I want to be able to enter our cost per KWH, connect a device to it, and come
back in some random period of time to see how much power it used, and how
much it cost to run (it would be nice if it also computed daily and monthly
costs,
based upon the measurments it took, as well)

But, hey, if someone has already created such a beast, why recreate it when
time is the important thing right now...  So - does anybody know of such a
thing?

rusty (spam_OUTrustyTakeThisOuTspamazfms.com or .....rustyKILLspamspam@spam@descomp.com)

(And I never can remember - is OT OFF topic or ON topic??? ;-)

1997\12\10@101907 by Thierry Grandpierre

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Everyday With Practical Electronic magazine have already describe
such device in its one of its last two years edition,
I'll try to give you more info tomorrow

Thierry Grandpierre

1997\12\10@104143 by Harrison Cooper

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       Look for the national semi app note AN-265 (Linear Applications
book), for a watt-watt-hour meter

1997\12\10@113347 by tjaart

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Rusty Carruth wrote:


> I want to be able to enter our cost per KWH, connect a device to it, and come
> back in some random period of time to see how much power it used, and how
> much it cost to run (it would be nice if it also computed daily and monthly
>  costs,
> based upon the measurments it took, as well)
>
> But, hey, if someone has already created such a beast, why recreate it when
> time is the important thing right now...  So - does anybody know of such a
>  thing?

http://www.sames.co.za/proinf.html has exactly what you want. It is even
PIC - friendly! (Local is lekker hehehe)

> (And I never can remember - is OT OFF topic or ON topic??? ;-)
ONLY topic <G>

--
Friendly Regards

Tjaart van der Walt
tjaartspamKILLspamwasp.co.za
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1997\12\10@114404 by Harold Hallikainen

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       Have a look at the Analog Devices AD7750 Product-to-Frequncy
Converter.  You can feed it an AC voltage sample, an AC current sample,
and it will generate a frequency proportional to the instantaneous power.
Count the pulses over a period of time and you get the energy use in
joules, watt-seconds, or whatever.

Harold

1997\12\10@195908 by Santiago

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part 0 1700 bytes content-type:text/x-vcard; charset=us-ascii; name="vcard.vcf"Cheers
Santiago
Tjaart van der Walt escribi—:
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1997\12\11@134911 by Nigel Goodwin

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In message <EraseME348EAB93.BBD47272spam_OUTspamTakeThisOuTinficad.com>, Rusty Carruth
<rustycspamspam_OUTINFICAD.COM> writes
>Ok, I've got a question - I want to build a device which keeps track of how
>much energy a power-line-connected device (AC, Freezer, light, fan, whatever)
>draws over the period of a day or week or month or ...
>
>I had figured to use the toroid method mentioned earlier for measuring current,
>with some other means of measuring voltage (just to be complete and slightly
>more accurate - shucks, I could even compute power factor if I can get 'near-
>instantaneous' voltage and current measurements).
>
>I want to be able to enter our cost per KWH, connect a device to it, and come
>back in some random period of time to see how much power it used, and how
>much it cost to run (it would be nice if it also computed daily and monthly
> costs,
>based upon the measurments it took, as well)
>
>But, hey, if someone has already created such a beast, why recreate it when
>time is the important thing right now...  So - does anybody know of such a
> thing?

There was a project for doing this in 'Everyday and Practical
Electronics' Feburary/March 1996. It uses a PIC16C84 to run the device,
the software can be downloaded from their website 'http://www.epemag.wim
bourne.co.uk'.

I've built the project, it works fine! - it displays total number of
watt/hours used, and the total cost used - both of these from when it
was plugged in. The price per unit is stored in the PIC's EEPROM so
doesn't need re-entering.

It's presently connected to my fridge/freezer - it's really depressing
:-(.
--

Nigel.

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1997\12\11@145755 by John Andrews

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    Hi Rusty et al,

    I'd suggest Microchip's reference design PICREF-3? Its a fully
    designed and debugged PIC16C924 based watt hour meter. The code,
    schematics and bill of materials are on the web site:

    http://www.microchip.com

    Just look under app notes and reference designs.

    Always Lurking...

    John E. A.

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