Can you stick a resistor in series with the probes, in the range of 1 to 100
ohms?

If you can, then amplify the AC voltage measured across the resistor and
rectify it. If you need good linearity you can use an op-amp based active
rectifier.

Paul


> 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.
>
> --
> Best regards
>
> Tony
>
> mICros
> http://www.bubblesoftonline.com
> mailto:sales@bubblesoftonline.com

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