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'[PIC]: Analogue random noise'
2001\10\19@115459 by 29ycmFs?=

Hello,

I need to generate an Analogue random noise with a PIC, but I have to use
the internal D/A converter.

Where do I can find the program?

Thanks. David.

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2001\10\19@120752 by asena

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Ola David !

Witch PIC are you using?

Search for in the archives of the list, because there have been some discussions before, about RAMDOM generators.


Sena






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2001\10\19@144517 by Thomas McGahee

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See the recent thread(s) on generating a random number.
Feed random numbers into the D/A converter. The result
should be random noise. If it isn't, then the random
numbers weren't really random after all...

Fr. Thomas McGahee

{Original Message removed}

2001\10\19@150608 by 742-9014

face picon face
> I need to generate an Analogue random noise with a PIC, but I have to use
> the internal D/A converter.
>
> Where do I can find the program?

Nowhere.  PICs don't have internal D/A converters.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, .....olinKILLspamspam@spam@embedinc.com, http://www.embedinc.com

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2001\10\19@151830 by Ned Konz

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On Friday 19 October 2001 10:54 am, Olin Lathrop, Embed Inc, 978-742-9014
wrote:
> > I need to generate an Analogue random noise with a PIC, but I have to use
> > the internal D/A converter.
> >
> > Where do I can find the program?
>
> Nowhere.  PICs don't have internal D/A converters.

There are several new PICs that will have op amps, D/A converters,
comparators, switch-mode power supply controllers, and voltage references on
chip. They are currently called "Future products", though there is
information about them available. Look for the 16C78x family.

There is a kind of low-frequency D/A converter, if you consider the
PWM outputs on some PICs. Using even simple R/C filter, these will work for
many purposes.

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homepage:  http://bike-nomad.com

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2001\10\20@024001 by Jo Scherpenisse

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----- Original Message -----
From: "David Expósito Corral" <.....davidexpositoKILLspamspam.....HOTMAIL.COM>
To: <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU>
Sent: Friday, October 19, 2001 5:53 PM
Subject: [PIC]: Analogue random noise


>to generate an Analogue random noise with a PIC, but I have to use
> the internal D/A converter.

On 17-oct I posted a message with a random generator. I am at home now, so I
don't have the routine at hand.
==================
Jo Scherpenisse
Stadhoudersring 494
2713 GP  Zoetermeer
tel 079 3169098
==================

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2001\10\22@073856 by Vasile Surducan

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Why with a PIC ? There are many simplest methods to generate white or
pink ( zenner based) noises which are randomly.
Vasile

On Fri, 19 Oct 2001, [iso-8859-1] David Expósito Corral wrote:

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2001\10\22@130301 by Michael Vinson

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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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2001\10\22@131958 by Scott Newell

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Broadband random noise generation:

http://www.linear-tech.com/pub/document.html?pub_type=desn&document=90


With a digital output, see figure 199 of:

http://www.linear-tech.com/pub/document.html?pub_type=app&document=89


newell

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2001\10\22@194412 by alice campbell

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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


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2001\10\23@045603 by Vasile Surducan

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I have somewhere some schematics but I must find them and scan them for
sending via email. Please be a little patient, I saved your mail address.
Vasile

On Mon, 22 Oct 2001, Michael Vinson wrote:

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2001\10\24@062257 by dr. Imre Bartfai

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Hi,

I have already offered a schematic in the PICLIST. It uses an obsolete
Ge-transistor, which b-e junction is noisy and can be amplified.

Regards,
Imre

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On Mon, 22 Oct 2001, Michael Vinson wrote:

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'[PIC]: Analogue random noise'
2001\11\01@150839 by =?iso-8859-1?B?Tm9tZWwgoA== ?=
Instead of using a A/D, you could always use a comparator to an input on one of the port pins. You could have a routine that loops and stores the state of the pin into a bit in memory. Once you have eight of these you have a byte from 0 to 255. I imagine the actual value would linger somewhere in the middle, but thats expected for guassian type noise.

I guess you could use, if applicable, a built in comparator, but you should turn Interrupts for it off.

{Original Message removed}

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