|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.