[sdiy] Has anybody done a diy IR MIDI link ?

[Happy Harry]

And the short pulses let you get MUCH larger forward
current (and light intensity) without overheating
the device...

H^) harry


>From: Sowa Roman <Roman.Sowa at upc.com.pl>
>To: "'synth-diy at dropmix.xs4all.nl'" <synth-diy at dropmix.xs4all.nl>
>Subject: RE: [sdiy] Has anybody done a diy IR MIDI link ?
>Date: Fri, 7 Jun 2002 07:34:58 +0200
>
>IRDA works on narrow pulses instead of whole bits.
>Probably to save power, and send only short high power
>blinks. Converter chip splits each bit comming from UART
>into 16 slots and drives LED only during one of them
>(or 3, can't remember). IRDA receiver takes those short
>pulses and makes nice UART-friendly bitstream back again.
>
>I guess those short pulses are also better in terms of
>interference with other IR sources as it spreads the
>spectrum of IRDA signal.
>
>Roman
>
>-----Original Message-----
>From: Tim Ressel
>To: Doug Forbes; Neil Johnson
>Cc: synth-diy at dropmix.xs4all.nl
>Sent: 02-06-07 02:08
>Subject: Re: [sdiy] Has anybody done a diy IR MIDI link ?
>
>Yo,
>
>I just perused the Agilent website. They seem to think
>you need an interface chip to go between the UART and
>the IRDA transceiver to do something called "3/16
>modulation". I suspect you can fake it for this
>application.
>
>--TR
>
>--- Doug Forbes <av599 at lafn.org> wrote:
> >
> > Hi Neil, thanks for the reply,
> > What I want to do is build an interface for a PDA
> > that will convert the
> > "beaming" serial stream to MIDI. I figured to use an
> > IrDA pair. Data errors
> > ? What data errors.
> > Seriously I guess just keep everything close enough
> > to minimize the errors.
> > Doug Forbes
> > Professor Music Technology / Computer Science
> > College of the Canyons
> > Valencia, Ca.
> >
> > >
> > > What do you plan to do about data errors??  MIDI
> > doesn't have much in the
> > > way of a "protocol" :-)
> > >
> > > Neil
> > >
> > > --
> > > Neil Johnson :: Computer Laboratory :: University
> > of Cambridge ::
> > > http://www.njohnson.co.uk
> > http://www.cl.cam.ac.uk/~nej22
> > > ----  IEE Cambridge Branch:
> > http://www.iee-cambridge.org.uk  ----
> > >
> > >
> >
>
>
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