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Suitable sensor for SMART METER

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nicko-391

nicko-391

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Im makning smart meter.Im going to check the rotating disk of the usual utility energy meter. To identify units i want to identify black region
of the disk.I suppose to set a sensor in front of the disk. My question is which sensor is suitable for this.

Is LDR suffient?

Please give some advice.
 

Hey it would be better if u use a Photo dioder in place of this LDR.
 

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