Power Monitor Arduino
http://www.avbrand.com/projects/powermonitor/ http://arduino.cc/forum/index.php/topic,8635.0.html http://openenergymonitor.org/emon/buildingblocks/report-yhdc-sct-013-000-current-transformer make 2 CT-Sensor https://github.com/openenergymonitor/emonTxFirmware/blob/master/Guide/b_SecondCT/b_SecondCT.ino http://www.stoaks.net/index.php/tag/emon-ct-sensors/