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You have 2 choices here:
1. Hall sensor (similar to this one: **broken link removed**)
or
2. Simple shunt resistor to convert current into voltage and just measure voltage accross this resistor..
Regards,
IanP
It depends whether you are trying to measure AC or DC and magnitude of current. For AC you could also use a current transformer in addition to the resistor and hall effect techniques. Keep in mind that you do not get isolation with a resistor. Hall effect devices tend to be inaccurate especially over temperature.
Look at the Allegro current sensors, which are hall effect but are nicley packaged with 0-5V output and several different current ranges
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