Subject:
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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 22:43:55 GMT
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Original-From:
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Bill Rose <BROSE@IPA.NETnospam>
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Viewed:
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2222 times
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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 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 2 Replies:
 | | Re: IR Collision avoidance
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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() (...) (28 years ago, 24-Feb-97, to lugnet.robotics.handyboard)
| | | Re: IR Collision avoidance
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| (...) OK. (...) The transmitter is basically a modulator made from two 555 timer chips. One timer does 200-1000 Hz (we use 500) while the other does 38 KHz. On a scope, the output looks somewhat like.. |||...||| |||...||| |||...||| | | | | | | | | | (...) (28 years ago, 25-Feb-97, to lugnet.robotics.handyboard)
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