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At last a chance to catch up with my Energy Monitor Arduino Project.   Here is the circuit I will build to work with my Arduino Uno via the SPI interface:   It is a design that was informed by discussions from this question:   How to Use Current and Voltage Sensors on Domestic supplies - Worldwide?   In the USA they use a split transformer to feed power to houses so that appliance will run on 110V or 220V. Using 220V keeps the current down for cookers and heaters.   ...

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