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Bill Porter built this excellent DIY Power Meter to monitor the electricity usage of his home. It’s capable of measuring not only the amount of power that his house consumes, but also other fun facts such as power factor, voltage and frequency, and transmits the information wirelessly to a separate display system. He has a thorough explanation of the design process on his website, along with source code and schematics for the project. [via Hacked Gadgets]