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'[EE] Monitor house current Magazine article Info??'
2010\04\09@170255 by Carl Denk

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About 4 years ago, there was an article in either Nuts & Volts or
Circuit Cellar magazine that showed how to measure the current (amps) on
household electrical circuits. The method was to take say 6 wraps of #18
yellow wire around one circuit's hot wire at the circuit breaker. These
pairs of wire were then routed to a PCB that had some circuits to
prepare the signal for ADC conversion and then on to a Microprocessor,
like a PIC.

IF someone can point me to the year/month of the issues, that would be
appreciated. I believe the article spanned 2 months issues. Or if
someone has the issues, and could scan the pages and E-mail them, that
would be great. I go back about 3 years in magazines, some months ago, I
sent the older (10 years) to a better home.

Our electric power cooperative will be going to smart metering shortly,
and time of day rates will be phased in. I am hoping to be able to shift
a good part of the heavy usage to the low rate times.

2010\04\09@180749 by William Bross

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Carl Denk wrote:

>About 4 years ago, there was an article in either Nuts & Volts or
>Circuit Cellar magazine that showed how to measure the current (amps) on
>household electrical circuits. The method was to take say 6 wraps of #18
>yellow wire around one circuit's hot wire at the circuit breaker. These
>pairs of wire were then routed to a PCB that had some circuits to
>prepare the signal for ADC conversion and then on to a Microprocessor,
>like a PIC.
>
>IF someone can point me to the year/month of the issues, that would be
>appreciated. I believe the article spanned 2 months issues. Or if
>someone has the issues, and could scan the pages and E-mail them, that
>would be great. I go back about 3 years in magazines, some months ago, I
>sent the older (10 years) to a better home.
>
>Our electric power cooperative will be going to smart metering shortly,
>and time of day rates will be phased in. I am hoping to be able to shift
>a good part of the heavy usage to the low rate times.
>  
>
Carl,
According to Dave Tweed's Circuit Cellar index, how about these:

   * #73 August 1996
     <http://www.dtweed.com/circuitcellar/caj00073.htm#1087>, p. 48,
     *From the Bench* Nonintrusive Current Monitoring
   * #74 September 1996
     <http://www.dtweed.com/circuitcellar/caj00074.htm#1109>, p. 78,
     *From the Bench* Nonintrusive Current Monitoring: Part 2:
     Real-time Energy Profile

These may not be the articles you wanted though.  I seem to recall that
he stuck the hot wires he wanted to monitor through a toroid and had a
small number of secondary turns going back to his monitoring circuit.  
Then there's this one:

#164 March 2004 <http://www.dtweed.com/circuitcellar/caj00164.htm#2884>,
p. 74, *Intelligent Current Sensing* Harness the Power of the ACS750
Hall Effect Current Sensor

It's about six years old.  Time flies when you're having fun.......

Bill

2010\04\09@180943 by Vitaliy

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Carl Denk wrote:
> About 4 years ago, there was an article in either Nuts & Volts or
> Circuit Cellar magazine that showed how to measure the current (amps) on
> household electrical circuits. The method was to take say 6 wraps of #18
> yellow wire around one circuit's hot wire at the circuit breaker. These
> pairs of wire were then routed to a PCB that had some circuits to
> prepare the signal for ADC conversion and then on to a Microprocessor,
> like a PIC.
>
> IF someone can point me to the year/month of the issues, that would be
> appreciated. I believe the article spanned 2 months issues. Or if
> someone has the issues, and could scan the pages and E-mail them, that
> would be great. I go back about 3 years in magazines, some months ago, I
> sent the older (10 years) to a better home.
>
> Our electric power cooperative will be going to smart metering shortly,
> and time of day rates will be phased in. I am hoping to be able to shift
> a good part of the heavy usage to the low rate times.

Carl,

Look through the TOCs, and see if you can find the article:

http://www.circuitcellar.com/archives/CC%20Titles%201-233.pdf

Vitaliy

2010\04\09@200329 by Carl Denk

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I had looked in the TOC's, but it didn't catch my eye. Thanks for the
link. Another person narrowed it down to August , Sept. 1996. My present
collection starts 4 issues later.

On 4/9/2010 6:08 PM, Vitaliy wrote:
{Quote hidden}

2010\04\09@200847 by Carl Denk

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Thanks William, those first 2 is the article. Now I'm looking for a copy
of that article. Scanned and E-mail would be great, but whatever works
is OK.

The 3rd link is a chip that has the main conductor terminals on it and
mounts to the PCB. The first is nice with 600 volt wire running into the
breaker box, and bringing out only low voltage. A PCB can have the
electronics in another cabinet without EMI, RF issues.

On 4/9/2010 6:07 PM, William Bross wrote:
{Quote hidden}

2010\04\09@213419 by Dave Tweed

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Carl Denk wrote:
> Thanks William, those first 2 is the article. Now I'm looking for a copy
> of that article. Scanned and E-mail would be great, but whatever works
> is OK.

I can send you the original archive PDFs tomorrow, if no one comes up with
them sooner.

-- Dave Tweed

2010\04\10@082908 by Carl Denk

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That would be appreciated, and tomorrow will be more than soon enough. I
am getting a head start on getting organized. :)
If someone else delivers, I'll keep you posted.

Thanks again. :)

On 4/9/2010 9:34 PM, Dave Tweed wrote:
{Quote hidden}

2010\04\10@120619 by Jim Korman

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Carl Denk wrote:
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To Dave - Thanks for maintaining the ccindex. Its been helpful more than
once.

Jim

2010\04\11@103558 by Dave Tweed

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Jim Korman wrote:
> To Dave - Thanks for maintaining the ccindex. Its been helpful more than
> once.

You're welcome. I appreciate knowing that people find it useful.

-- Dave Tweed

2010\04\11@121127 by Bo Dirigo

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Jim Korman wrote:
> Carl Denk wrote:
>  
>> That would be appreciated, and tomorrow will be more than soon enough. I
>> am getting a head start on getting organized. :) ...
>>    
<snip>
{Quote hidden}

Newbie here and wish to ask what is this "ccindex" you referenced?  I'm
in the same situation as the OP as my electric co-op has already
installed these smart meters and am sure my Co-op will eventually
implement what the OP (Carl Denk I believe) has suggested.  I too would
like to know and be able to shift power usage to low peak periods if
possible.

2010\04\11@121511 by Bo Dirigo

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Dave Tweed wrote:
> Jim Korman wrote:
>  
>> To Dave - Thanks for maintaining the ccindex. Its been helpful more than
>> once.
>>    
>
> You're welcome. I appreciate knowing that people find it useful.
>
> -- Dave Tweed
>  
Please ignore my most recent submittal.  I feel a wee bit foolish as I
missed the new Subject line which spells out "Circuit Cellar" and thus,
ccindex.  My apologies!!

Thanks Dave for maintaining it as well.

Bo Dirigo

2010\04\11@125435 by Carl Denk

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Just saw Bo's later message, but I had this started. :)

ccindex refers to Circuit Cellar Magazine index of articles I believe.
The article describes in the breaker box, passing the hot wire from a
breaker through a toroid, and say 14 turns of #24, 600 volt rated wire
around the toroid. The ends of the wire go to an OP- AMP, and then to a
microcontroller, they use a Stamp, but I would use a PIC or PLC. The
microcontroller can then with (electronic) relays turn things on and off
by the clock, and also monitor say freezer temperature, and if need be
turn it on during the high rate period.

If someone would like the articles, send me a private message, and I'll
attach to a reply. :)

On 4/11/2010 12:12 PM, Bo Dirigo wrote:
{Quote hidden}

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