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Posted by Epictitus on February 28, 2007, 7:20 pm

"current transformer"

split cores make life easier

Posted by BobG on February 28, 2007, 7:49 pm
Look up TED The Energy Detective... sniffs ea breaker in the box with
a hall sensor... gives kWhrs used, cost, estimated bill at current
rate, LCD screen.

Posted by Epictitus on March 1, 2007, 3:26 pm
 Cool idea but he already has a data logger and you can get CT's at
electronics surplus stores cheap cheap.

BTW, TED uses CT's clipped on the mains, not hall effect sensors

Posted by Duane C. Johnson on February 28, 2007, 8:32 pm
 Hi Burlington;

 > Just got myself a data logger. This is an 8 channel
 > unit which records data from a variety of sources,
 > but what I'm trying to do is download household
 > electricity, gas and water consumption with a view
 > to recognizing waste. My aim is eventually to use
 > it in a commercial operation.

 > The gas and water metering is up and running. Both
 > the meters put out a pulse which is translated into
 > a volume. It's already amazed me how wasteful we
 > are at certain times.

 > Electricity is harder, as I persuaded my utility
 > company to install a new meter with a pulsed output,
 > but it's not an electrical signal as I'd hoped but
 > a flashing light. Every flash is 1/10th of a KWH. I
 > need to build a device which responds to the flashes
 > and converts into an electrical signal.

 > A photo transistor comes to mind but I've no idea
 > how to do this. Can anybody help?

Try this one I designed. In this case I am using a
conventional LED as a photo detector.



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Posted by _jj_ on March 1, 2007, 4:45 am
This company has a device to watch your meter ...


On 28 Feb 2007 07:13:59 -0800, "Burlington Bertie"

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