Power Measurement. Please help !!!!!

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joshln

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I am working senior project, I try to measure how much power of consumer use for monthly.I’m stuck; I don’t know how to get the power from the outlet. I think about. One side it plug in the outlet, one side is go to the appliances, another side go to the microcontroller unit to process digitally. Thank you for your help !!!!
 

Pls see the connection shown in attachment. Hope it will help.
 

Thanks ! Nicleo & IanP. how you take that data to A/D to microcontroller unit ?
 

Data frm A/D to microcontroller can be sent:

(i) Parallelly (8-bit, 10-bit, 12-bit, etc.)
(ii) Serially (I2C, SPI, etc.)
 

searching on Atmel and Analog Devices site you'll find some nice solutions regarding your posts.

hope this help,
//a
 

one question nicleo. why is the current measured in the live wire. why not the neutral wire. because both the live wire and the neutral wire should have the same current.
 

Live wire carries all current which can be greater then neutral wire current in case of bad installation or fault insulation. Current measurement on live wire usually requires current transformer. Current measurement can be of cause done on neutral wire what simplifies isolation problems. Suggestion: look at ADE7756 datasheet (Analog Devices).
 

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