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Filtering/Voting system algorithm

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haytham

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I am sampling several voltages on a somewhat noisy PCB using the A/Ds on a PIC16F877 device. The AD readings come back "jittery" and I would like to write a filtering algorithm or a voting system algorithm to process these readings before start taking action based on them. Accuracy needed is less than 20mV.
Could any one help me in this.
Preferable code are assembly codes not C ones !!
 

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