Current Transformer- SCT-013-030

Submitted by Guest on Mon, 30/05/2011 - 10:58

I recently purchased the above current transformer from Sparkfun and the unit is working properly.

I have an arduino running the Open Energy code but I am getting current measurements even when the CT is not connected.(I thought the digital filtering was suppose to take of this??)

If I connect the CT and calibrate the arduino say when having a load of 20Amps, the unit does not seem to detect very light load like 100W whereas it can be detected by multimeter.

Re: Current Transformer- SCT-013-030

Submitted by Amin Zayani (not verified) on Thu, 02/06/2011 - 16:14.

Hey,

I had the same problem. I fixed it by connecting the other unused analog inputs on my arduino to ground (with a large resistor). That will delete the interferences that other alanlog inputs cause to your current input.

Try that and tell us how it works out for you!

Cheers!

Amin

Re: Current Transformer- SCT-013-030

Submitted by Guest on Sat, 18/06/2011 - 12:03.

Thank Amin,
I did that and the unit is now responding properly by giving the correct values.
However am getting negative real power values!

Re: Current Transformer- SCT-013-030

Submitted by glyn.hudson on Sat, 18/06/2011 - 23:00.

Try clipping on the CT sensor the other way! Or swap round the connections to the CT. This should sort it

Glyn.

Re: Current Transformer- SCT-013-030

Submitted by ggkinuthia (not verified) on Mon, 20/06/2011 - 05:04.

Thanks Glyn,

The uno is running perfectly!

Good day.

Geoffrey

Re: Current Transformer- SCT-013-030

Submitted by Sergegsx on Wed, 19/10/2011 - 20:53.

Is this a common practice? to connect unused analog pins to ground using a big resistor?

I believe my setup is running correctly but maybe its something i should think about adding or at least know.

So is it recommended in all cases?

thanks

Archived Forum