Subject:
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IR wall detection
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 14 Jan 1997 01:33:52 GMT
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Original-From:
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Keith the wonder wookie <kas219@/StopSpam/psu.edu>
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Viewed:
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2395 times
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I have recenty perfected a simple sensor using the Sharp IR detector but I
need some help in interfacing it. I plan on having about 16 sensors all
around the perimiter of the robot but I don't want to have them running all
at the same time because of the chance of one picking up the signal of the
other. I have decided to use a sequencer to trigger each sensor in
succession. To further reinforce the signal I would like to modulate the
40kHz signal so that it won't be fooled by a TV remote control. That is
where I need some help. I know how to modulate the signal but I don't know
how fast to do it or what to use to sence the modulation on the reciever.
I hope that what I said made sence and someone can help me. I have just
decided to make a try for the Trinity Fire fighting competition in April so
I have get this done quickly. Thanks for all your help.
Keith Soldavin
kas219@email.psu.edu
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Message has 2 Replies:
 | | Re: IR wall detection
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| (...) Could you tell me the cost & range for these? (...) Could you trigger them in an interleave-like sequence? Seems that would reduce interference to just about zero. If you number 1-2-3 starting at zero degrees and going clockwise, you could set (...) (28 years ago, 14-Jan-97, to lugnet.robotics.handyboard)
| | | Re: IR wall detection
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| Keith, Try an LM567. It's a tone decoder with PLL and VCO. Basically set the internal freq. of the 567 any where between .01 Hz up to I think 500 kHz. Feed a signal into the 567 and if the freq's match up, the 567's output goes low. I've been (...) (28 years ago, 16-Jan-97, to lugnet.robotics.handyboard)
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