YNR,
I have seen several projects like this out there:
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I like how Google charts can be used to post usage data to the web. However the IoBridge looks expensive, im sure you can save a pretty penny using an Arduino.
Exactly what type of resolution are you looking for? A spike as in running a hair dryer for about 3 minutes, or spike as in initial starting current of an induction motor? If you want to have a sampling rate large enough to see the second example your going to be dealing with a loooooot of data.
I have been thinking about a power monitoring project for awhile now. I would like to have access to overall house mains consumption as well as individual appliance consumption info. My main concern is making the individual device monitor as small cheep and simple as possible. Possibly communicating via x10 to the mains monitoring unit. My goal would be <$10 per unit. Perhaps when I finish up some more of my current projects I will look into this more.
Google PowerMeter is also a verry interesting project, as a smart grid gets developed.
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I would love some more information as to the measurement and communication methods these "smart meters" will be using.
~Tyler