He, he, I like your ideea with dogs...
but it's wrong because delay_10uS ( 66 ) means 660uS
so, 660uS x 2 ( one on one off ) = 1.2 ms
1/1.2mS = 833,(33) Hz which is a perfect buzz sound even for a human ear.
Cheers, Vasile


On Thu, 18 Jan 2001, James Paul wrote:

>  Vasile,
>
>  Correct me if I'm wrong, but if you have the output on for 10uS
>  and off for 10uS, that's a period of 20uS which equates to a
>  frequency of 50Khz, and this 50Khz signal would last for about
>  5 seconds.  So even if it was working, you wouldn't know it unless
>  you're a dog or cat or something.  Just a thought...
>
>                                               Regards,
>
>                                                 Jim
>
>
>
>
>
> On Wed, 17 January 2001, Vasile Surducan wrote:
>
> >
> > There is a better way using tmr1, with next routine pic is busy all
> > that 5 seconds just with delays...Maybe you want to sing a real song
> > Check at www.piclist.com/jal
> > By, Vasile
> > http://www.geocities.com/vsurducan/pic.htm
> >
> >
> > include f877_4
> > include jpic
> > include jdelay
> >
> > -- noise generation procedure with variable tones
> >
> > pin_d1_direction = output
> > var byte ton = 66
> >
> >  for 255 loop  -- 255 x 15 x 10uS x 2 x 66 = 5049 mS
> >   for 15 loop
> >    pin_d1 = high
> >    delay_10uS ( ton )
> >    pin_d1 = low
> >    delay_10uS ( ton )
> >   end loop
> >  end loop
> >
> >
> > On Wed, 17 Jan 2001, Paul Chicofsky wrote:
> >
> > > Hi all
> > >
> > > Any body know how to program the pic16f877 so it outputs a beep to a speaker
> > > for only 5 seconds?
> > >
> > > Thank you
> > >
> > > Samer
> > >
> > > _________________________________________________________________________
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> > >
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> > >
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> jim@jpes.com
>
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