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line current value calculation with ADC of PIC

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karthi_keyan

karthi_keyan

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hai,

presently am designing line measuring unit using PIC micro controller. in this am having shunt type step down unit which gives sinusoidal wave with respective to load current.so i interfaced with the controllers ADC section and try to get peak values and with some calculation(multiplication factor) i displayed the data .

here am struggling with the peak value getting function it gives the value +-5 ranges(495-500)for same load.so the output is not stable. can any one help me to get the current readings from sine wave of shunt type step down power measuring unit?

regards,
karthikeyan
 

how about putting a sampling capacitor at the ADC pin and/or take a few samples of the reading and display the average of that. ?
 

hai cam,


ya i tried with 10uf capacitor at the end of the opamp IC of power measuring unit .but still its not stabilized its still wobbling. i think some other method is there to measure from shunt transformer output.


can anyone suggest me a better solution in this?


regards
karthikeyan
 

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