Subject:
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Re: Use PC's IR port instead of IR tower?
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Tue, 10 Oct 2000 12:17:27 GMT
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Viewed:
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1988 times
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In theory it's possible, provided that:
[1] The optical frequency matches adequately (anyone know?)
[2] 38400 Hz is close enough to the RCX/Scout modulation frequency to get
past any bandpass filtering..
[3] The PC software can accurately turn IR on/off at 2400baud in software
(I see no problem with this under interrupt control in DOS).
If I get my oscilloscope back from a relative (!), and I can prise the Scout
off the kids occaisionally I'll give it a go. It won't be a Win32 solution :)
Phil.
Reimer Mellin wrote:
>
> The basic difference between PCs/PalmPilots/WinCE IR ports and the RCX is a
> different physical transmission/modulation protocol. In the PC etc case the
> commonly used format is described by the IrDa standard (www.irda.org) where
> seperate IR pulses are used to transmit Bits. The RCX uses a format
> 'loaned' from Remote controls where a IR carrier frequency is used to
> transmit bits in a similar fashion to radio transmission (i.e. a missing
> period in the carrier denotes a Bit).
>
> However, I have seen applications where a PC was turned into a remote
> control for TVs etc by programming the IR hardware directly. Obviously thats
> HW dependant. Check the following links for more information:
> http://www.ee.washington.edu/eeca/circuits/PCIR/Welcome.html
> http://www.chambord-tech.com/
> http://www.dodgies.demon.co.uk/FAQ/IrDa.html
>
> Cheers
> Reimer
>
> Brad Aisa <baisa@NOSPAMbrad-aisa.com> wrote in message
> news:38277AEC.2FA599A0@NOSPAMbrad-aisa.com...
> > Hello,
> >
> > Is it possible to use a PC's IR port, instead of the IR tower, to
> > communicate with an RCX?
> >
> > (I have a Dell Inspiron 3500).
> >
> > --
> > Brad Aisa
> > baisa@NOSPAMbrad-aisa.com -- PGP public keys available at:
> > http://keys.pgp.com:11371/pks/lookup2?op=index&search=Brad+Aisa
> >
> > "Laissez faire."
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Message is in Reply To:
 | | Re: Use PC's IR port instead of IR tower?
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| The basic difference between PCs/PalmPilots/WinCE IR ports and the RCX is a different physical transmission/modulation protocol. In the PC etc case the commonly used format is described by the IrDa standard (www.irda.org) where seperate IR pulses (...) (25 years ago, 12-Nov-99, to lugnet.robotics.rcx)
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