Current transformer interface for Arduino

Created by	nsayer
Created	July 24, 2013
Last modified	July 24, 2013
Tags	adc ammeter arduino current-transformer

The circuit to interface a current transformer to an Arduino analog input pin.

The burden resistor needs to be chosen based on the specifications of the CT and the expected amperage range for measurement.

R2 and the two zener diodes protect the controller from out-of-range input. Circuitlab doesn't "stock" them, but they're 1N5221Bs.

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Current transformer interface for Arduino PUBLIC