SOLVED: How can I reduce ADC jitter


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  1. #10
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    Jan 2005
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    Default Re: How can I reduce ADC drift

    CONFIRMED: Noisy power definitely messes up everything when the PIC tries to compare the "wiper" reading with VDD/VSS, even using two 1K resistors to simulate 50% pot.

    I switched to a 7805 supply and put back my "supposedly dirty" potentiometer. ADC low/high was back to a steady reading no matter where I turned the pot.

    I had code prepared using the techniques discussed in Melanie's ADC thread (or was it SORT, I don't remember). I got lost looking at the computational feature of the ADC in the 16F18877; that could have replaced my averaging routine and most likely reduced time.

    At worse if I get a dirty pot, I can drop the 1-2 lower bits from the 10-bit reading and still get 512-256 resolution out of a maximum 1024.
    Last edited by Demon; - 3rd November 2024 at 02:35.
    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

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