Real-time Power Usage Monitor
The how-to site Instructables has a tutorial on how to build a real-time home power usage monitoring system. The end result is a live chart in a web page that updates every 10 seconds with the instantaneous power usage from their entire house. The electrical current is measured on the main lines entering their home with AC clamps. The signal is then conditioned with a simple circuit and monitored by an ioBridge module and then charted in Google Charts as a kilowatt-hour calculation.
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