> The result is random enough for my purposes, but there might be better
> ways and I will be following this thread closely.

This is a h/w solution

http://home.clear.net.nz/pages/joecolquitt/white_noise.html

For various reasons a PRNG was not acceptable, so I use one of
these circuits to seed, start, and stop the PIC's timers for totally
random number production

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