What a great little sensor, but it would sure be nice to make the toroid clamp around existing cables. There's no easy way to put this on an existing AC wire without cutting / splicing the wire.

This doesn't have an reverse-voltage protection, does it? Won't it damage the analog pins on the Arduino? I need to use this simply to detect if the AC power is ON or OFF. The current draw on the AC should be ~2-5amps.

hi,
I use the arduino sketch of the wiki, but I got wrong values (for example 1000ma instead of 17mA). does anyone have ever use this to build a powermeter?

Hi,

How would be this conversion formule with 3,3 Vcc and 12 bits ADC:
amplitude_current=(float)sensor_max/1024*5/800*2000000;
effective_value=amplitude_current/1.414;//minimum_current=1/1024*5/800*2000000/1.414=8.6(mA)

What happens if in my wire there is a current of +/- 5A? What is the output?

I bought this device, but i don??t know how i can measuring the current,somebody could help me, please.