you need to be able to adjust for the WPM and CPM.  I have a morse
machine that this can be adjusted on.  A long time ago, say, some 20
years ago, one of the mags had a project to do this, but used all
discrets.  I had copied it, but it is long gone now.

> ----------
> From:         Nuno Pedrosa[SMTP:Nuno.Pedrosa@OEN.SIEMENS.DE]
> Sent:         Thursday, November 05, 1998 6:05 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: Morse Decoder
>
> I am a scout, and was thinking of this recently, to use in my Palm 3.
>
> In morse, there are 3 symbols: dot, dash and space.
>
> You can't translate a morse message like:
>
> ......-...-..---
>
> Without pauses, you will have many possible combinations!
> It could be possible to generate the most probable message, but
> it would be very difficult to get the exact one!
>
> .... . .-.. .-.. ---
>
> Having the symbols separated and encoded like Gavin said,
> why not just implementing a 2-way table?
>
> To detect the symbols, we could have 3 configurable times:
>
>  - dot time
>  - hash time
>  - space time
>
> Use a TMR and a pin with interrupt on change. Measure the
> value and the length of the value. Doesn't seem very hard,
> but, then again, I'm just talking... 8)
>
> By the way, for those who don't have a morse table handy,
> I said
>
> h e l l o
>
> Comments, anyone?
>
> Nuno.
>
>
> Gavin Jackson wrote:
> >
> > The first thing that comes to mind is to decode the
> > dot dash dash dot into 0110 with a '1' representing
> > dash and a '0' representing the dot. Then store a
> > table in the PIC and do a simple compare through
> > the table until a match is found. The only problem
> > I see with this method is trying to tell the difference
> > between a J ( . - - - ) and a 2 ( . . - - - ) which would be
> > 0111 and 00111 respectively.
> >
> > Maybe this gives you some other ideas.
> >
> > Regards
> >
> > Gavin
>
> --
> ----  ~~~~~~  --------  Nuno Filipe Freitas Pedrosa
> --  ~~~~     ~~  -----  SIEMENS S.A. Portugal       TEL: +351 1
> 4242454
> -  ~~~~       ~~  ----  mailto:Nuno.Pedrosa@oen.siemens.de
> -  ~~~~       ~~  ----  "Smile, and tomorrow will be a better day!"
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> =
>