EnerJar
The EnerJar is an easy-to-build device that accurately measures the power draw of electrical appliances. The EnerJar was the winner of the Greener Gadgets design competition. The design is still being optimized, but preliminary schematics and source code can be found on this site by following the “Hardware” and “Software”.The EnerJarย�is designed based on PIC16F877.
   EnerJar
Full details on enerjar.net

 
 
 

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