Have you tried just converting one channel and not multiplexing the ADC? I have had issues before because a previous channel precharged the ADC and would see the same kind of "bias" voltage even though the channel being converted is grounded.
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Have you tried just converting one channel and not multiplexing the ADC? I have had issues before because a previous channel precharged the ADC and would see the same kind of "bias" voltage even though the channel being converted is grounded.
Tim Barr
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Once again, Melanie, you've saved my bacon!
It was Vref+ and Vref-. This is what I needed to do:
ADCON1 = %11101000
Bit 2 "0" selects Vss (internal) for Vref-
Bits 1-0 "0" selects Vdd (internal) for Vref+
No wonder the result was screwy!
Thanks!
Tim, thanks for your note, too. I'll remember that as a troubleshooting tip for the future.
Russ
N0EVC, xWB6ONT, xWN6ONT
"Easy to use" is easy to say.
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