I don't remember who asked, but there was a discussion about using wire loops
and Hall effect sensors for current monitoring a while back. I came across this
and will be trying it, so maybe this will help the OP as well:
http://www.allegromicro.com/en/Products/Part_Numbers/0756/index.asp20 or 40 mV/A bidirectional and isolated. Only a decoupling cap suggested.
Should be a nice easy pairing for a pic. Even cheaper than a shunt alone...
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