Brent Brown wrote:
>
> > Does anyone have any ideas of measuring a small AC current with the PIC
> > A2D?
> > A friend of mine has a hydroponic garden and wants to measure the
> > current flow between 2 probes which are fed with 16VAC.
> > I would imagine the current would be in the order of milliamps.
>
> Sounds like a soil moisture sensor or water nutrient tester? You
> could add a series resistor as suggested (to convert the current into
> a voltage), capacitively couple this into a rectifier circuit of some
> sort then feed into an ADC input. The 16VAC would need to be more
> regulated than just the output of a transformer if you want accurate
> results.
>
> I have a small and simple circuit idea that I could post if it's of
> interest. It uses the PIC to generate the AC as well.


Yes please :-)

--
Best regards

Tony

mICros
http://www.bubblesoftonline.com
mailto:sales@bubblesoftonline.com

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