Subject:
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RE: IR communication (fwd)
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 20 Nov 1996 02:09:12 GMT
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Original-From:
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Chuck McManis <cmcmanis@freegate.net*SayNoToSpam*>
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Viewed:
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742 times
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There will be a lot of IR radiation bouncing around and that can be problematic.
Another IR detection technique is to use a camcorder, they are sensitive to
IR light. Low light CCD cameras are even better.
If you want to hook up 4 IR xmitters from a common line, it is best to drive
each of them separately. You can do this with any high current driver or a
simple transistor switch. The problem with specifying "exact" parts is that
there are still too many variables to reduce to a managable number of solutions.
Some questions you need to answer:
1) How much drive current per LED?
2) What duty cycle?
3) Are all four LEDs sending the same thing?
4) Do you already have a discriminator protocol?
5) What is the required range? Field of view?
6) Do you expect to do purely software processing on the HB
or will you add additional hardware?
7) Did you look at the modular iRDA solutions? Were they
insufficient? How or why?
8) Will the environment have lots of ambient light? Will it be
dark? Indoors?
9) Do the detectors need to track the transmitter? (related
to field of view)
Without knowing a lot more about the system or a more specific question I
can't think of anything useful to say.
--Chuck
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From: Yoni Garbourg[SMTP:ygarbour@emerald.tufts.edu]
Sent: Tuesday, November 19, 1996 12:16 PM
To: HandyBoard
Subject: IR communication (fwd)
Can someone please attempt to help me out.. second posting???
I want to get five handyboards to talk to each other using infrared
transmission... I use infrared transmitter/receiver reflectance sensors
for other things...
1) What parts (I need distributer and part number) do I need to get and
can I hook up 4 trnsmitters in series to the IR output ports?
What else do I need?
2) Will it be a problem using the IR transmitters to send signals while
using the reflectance sensors near the receivers???
P.S. I hooked up a high output infrared transmitter (dark blue glass) to
the IR OUT sockets, and used ir_transmit_on to activate it. I used the
Radio Shack plastic IR sensor (cool thing) and it works, but the LED gets
really hot... DO I still need a 330 ohm (or so) resistor between anode and
Handyboard???
Sincerely,
Yoni Garbourg
<< To succeed, Atificial Intelligence needs
1.7 Einsteins, two Maxwells, five Faradays,
and .3 Manhattan Projects." >>
-John McCarthy
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