I use the current sensor module from seeedstudio.
When I try the testapplication and driver from seeedstudio I notice that the output is never higher than 0 when calling the Read method. I don’t know if this is driver bug or the sensor itself. If I don’t connect the sensor, only the module on the fez spider, I got values from 0-3 (probably values from the module itself??).
I use the Current Sensor 1.0 by Seeed Studio for .NET gadgeteer (found this on the back of the module).
The sensor itself: ydhc.com — SCT013-030 (type) — 1108-10330 (S/N I think).
the current sensor is suit for big current(input is 0~30A and output is 0~1V), if the curret too small, the module may not get the correct result, hope this reply can help you, thanks.