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can Micro Controller mesure AC 220V current ??

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tobb

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I want to make AC 220 current and voltage meter.. How do I make it..?
what the easiest way to mesure AC 220 current with micro controller ?? I have try for lower voltage DC i could used shunt and ADC on AVR Micro but what about 220V AC?? Any idea?? please.
 

G

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Hi,

Yes, is possible... you must use a current transfomer for current measurement, and a voltage transformer for voltage measurement.

With this devices you will have galvanic isolation between the AC network and your processor.

Best regards;
Pendragon
 

ME

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tobb

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Thanks.. but i wonder if there such a small current let say about 0.5-5 A is it work good with this method? because very small current can produce very small amount of voltage from current transformer.. did any one try this methode for small current ?
 

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I would recommend you use one of these true RMS current transducers with 0-5 Vdc output, they have a basic accuracy of 0.5%. http://www.crmagnetics.com/newprod/transducersg.asp
You can get these transducers with current ranges from 0-0.5A, 0-5A, 0-10A and so on. So it should be possible to find a transducer with the right current range for your purpose. If you choose one with 0-5Vdc output you can connect it directly to your ADC. It doesn't get easier than this.

You can also find true RMS AC voltage tansducers, AC power transducers and frecuency transducers at this site as well.

Data sheet for true RMS AC current transducers: http://www.crmagnetics.com/pdf/CR4100_Series.pdf

Data sheet for AC current transducers:
http://www.crmagnetics.com/newprod/ProductView.asp?ProdName=CR4310

Application note for AC current transducers:
http://www.crmagnetics.com/pdf/an4310-1.pdf
 

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