Subject:
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Re: IR Collision avoidance
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 24 Feb 1997 23:57:19 GMT
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Original-From:
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Chris Moore <CMOORE@stopspammersCANCUN.ROSE.HP.COM>
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Viewed:
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2226 times
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The Handyboard has a circuit (U7a, R4, C6) that generates a 38KHz signal.
That drives an amplifier that then goes to J7, the IR LED output. If you
hookup an IR LED to this jack (with a series resistor) then when you turn
on TOC2 using ir_xmit_on() the IR pulse at a rate of 38KHz.
The IR decoders turn on an output when they detect IR light pulsed at a
rate of 38 KHz (or there abouts).
I have my IR LED's hooked up like this:
220 Ohm
o--------/\/\/\--------------+-------------+---------------+
J7 o (LED) (LED) (LED)
o----------------------------+-------------+---------------+
Each of the detectors is hooked to a digital input like this:
+--------+
o-----------------------| 3 | Ground
o-----------------------| 2 | +5
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o-----------------------| 1 | Signal
+--------+
Other than the 38KHz modulation that the board does in hardware I'm not
pulsing the LEDs. I just turn them on, at the decoder to see if I see
the light reflected from them, then turn them off.
Hope that clears it up.
Chris
On Feb 24, 3:16pm, Bill Rose wrote:
> You put your message on the mailing list concerning the IR avoidance. I
> have a question about the hardware also. How are the leds powered? Are you
> pulsing them some way or what? I guess the decoder is what is wired into
> the digital ports? Am I right about this? I just don't catch how you are
> powering the leds.
>
> Thanks,
>
> Bill Rose
> brose@ipa.net
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Message has 1 Reply:
Message is in Reply To:
 | | IR Collision avoidance
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| Chris or anyone who cares to respond, You put your message on the mailing list concerning the IR avoidance. I have a question about the hardware also. How are the leds powered? Are you pulsing them some way or what? I guess the decoder is what is (...) (28 years ago, 24-Feb-97, to lugnet.robotics.handyboard)
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