My favorite PIC method is to enable the WDT, then increment a counter in an infinite loop.

incf magic
goto $-1


When the WDT trips, the number in the counter is random, because the WDT is subject to thermal effects.  I have used the resulting number for the frequency of a beep routine, and found that a nice hiss results, which is good enough evidence of randomness for free.

You will need a WDT detector routine, watching the _TO bit of STATUS, to route around the loop and
finish up whatever else the program does.

Alice


> Vasile Surducan wrote:
> >[about generating random noise]
> >  Why with a PIC ? There are many simplest methods to generate white or
> >pink ( zenner based) noises which are randomly.
>
> Could you please elaborate, Vasile? (Details or links to details,
> whatever you want). I was recently reading something by some
> nuts who have set up a network of random number generators around
> the world to detect "tremors in The Force", or something. They
> use random bit generators based on physical (not numerical) noise,
> like thermal resistor (Johnson) noise. I looked on their website
> (which I'll provide if anyone is interested, I don't have it handy
> right now), but although there was lots of pseudo-scientific
> mish-mash, there was nothing as concrete as a schematic. So, to
> broaden the question a bit, can anyone provide details for a
> simple random-bit generator that works from a physical (not
> computational) source? I'm interested in playing around with
> such a thing (I have a lot of experience with stochastic time-
> series analysis). Thanks!
>
> Michael
>
> Thank you for reading my little posting.
>
>
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