In message <32D78F60.1333D6F5@informatik.hu-berlin.de>, "ranguelo@informatik.hu
-berlin.de" writes:
>In an other IR project i have used a Siemens SFH506 reciever. There are
>devices with a Bandpass for 30, 34, 40 and 56 kHz. What reciever should
>I
>use to be able to learn commands from different IR remotes, operating
>with different modulation frequency ?

        One of each.

        There have been a couple of people say that they have programmed
PIC's to time the various pulses from the remotes.  I did that when I was
experimenting with the HP28 infrared link previously discussed as well as
a few other remotes.  One thing I noticed from the HP28 was that the process
of timing the pulses was made more complex because there was occasionally
a very short glitch between two successive on times such as when there is a
transition between a 0 bit and a 1.  At other times, one got an on time which
was twice as long as a single on time and no glitch.  I used a Sharp module
for this system and it may be that there is always a glitch but the time
is so short that the resonator in the Sharp module rings enough to fill in
the gap.  Since proper readings are taken in the middle of a pulse, this
isn't really a problem, but it is if you are not sure of the signal format
and are paying attention to everything at once.

        One question I have for the list.  Are any of those IR detectors
fast enough to handle a .1 MS pulse or a 10 KHZ pulse train?  The Sharp
detector is good up to about 1400 or 1500 pulses per second at which point
it starts to miss them.  I need a detector that would work at 9600 baud.
I don't care if a bit gets mangled occasionally as long as most make it
through.  I do not care about the carrier frequency since I will make the
transmitter to match the receiver.

        Thanks for any detector suggestions.

Martin McCormick WB5AGZ  Stillwater, OK 36.7N97.4W
OSU Center for Computing and Information Services Data Communications Group