The simple true random number generator would be to run a timer while the
pushbuton is held down - this timer could increment while the button is
pushed and thus the number generated would be the time the user held the
button down. If a fast incrementing counter is used this would be absolut=
ely
random since you cannot push a button for exactly 34 uS repeatedly,  unle=
ss
you have superhuman reflexes.

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Michael Rigby-Jones
> Sent: 12 August 2002 05:39
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: Random sequence
>
>
> > -----Original Message-----
> > From: Sid Weaver [SMTP:NEWZED@AOL.COM]
> > Sent: Monday, August 12, 2002 4:24 PM
> > To:   PICLIST@MITVMA.MIT.EDU
> > Subject:      Re: Random sequence
> >
> > In a message dated 08/12/2002 11:19:23 Eastern Daylight Time,
> > ilinux@DKGOMEZ.COM writes:
> >
> >
> > >  Is there a way to a random sequence from either external
> input, or from
> > > the programming itself.  I=B9m doing led dies, and the method used =
just
> > > flashes through the sequence, until the user stops pushing the butt=
on.
> > I=B9d
> > > rather just have them push it once, no long period to hold, to star=
t
> > > sequence, and then have it use a random source to determine the num=
ber
> > > instead.
> > >
> > > Dave  Gomez
> > >
> >
> > Hello, Dave
> >
> > Just write
> >
> > start
> > random x
> > do your flashing thing
> > goto start
> >
> > if you make x a byte you get random numbers from1 to 1024.
> >
> > Sid
> >
> Well, I don't know what HLL you are using, or how you manage to
> fit 1024 in
> a single byte :0)
>
> Truly random numbers are not easy to generate, and the topic has been
> discussed countless times on the list.  If you want some numbers
> that simply
> appear to be random, you can quite easily make a pseudo-random number
> generator in a PIC.  Take a look at
> http://www.piclist.com/techref/microchip/rand8bit.htm for some examples.
>
> Regards
>
> Mike
>
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