Michael Rigby-Jones wrote:

> Correct, the signal being measured needs an amount of noise.  However, in a
> system with a 10+bit converter (especialy the PIC's) it's not unusual to
> have enough noise to toggle at least the LSB occaisionaly.  It ceratinly
> looks like the OP has a fairly noisy signal anyway.


Cheapest cleverest way to get some noise into the
ADC input? Small antenna track on PCB? Tiny cap
coupled to Vdd pin?? :o)
-Roman

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