i am currently working on energy home monitoring. But i having problem connecting CT current sensor to arduino board, since the output is audio jack. Its worked if its ACS712 because already have 3 pin output(Vcc,Ground Vout). But CT sensor only have 2 wires. Sorry for my english, can someone hlep me out about this.
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Open Energy Monitor has a complete tutorial on measuring AC voltage, current and power using Arduino.
Scroll down to the CT sensor page for an Arduino interface.
I just cut the audio jack off and soldered on different wires. For initial testing, if you dont want to remove the jack, try a couple of alligator clip leads. Clip one end to the appropriate location on the jack and the other end to a male-male test lead.