Subject:
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Re: IR Detection
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 30 Oct 1998 00:49:32 GMT
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Original-From:
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Rajbala Makar <makarraj@cse.msu.edu+nomorespam+>
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Viewed:
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1603 times
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> > Hi Everyone:
> >
> > I am trying out the infra red emission and detection with
> > the Handy Board. I have succeeded in the emission part
> > but the detection circuit is not working. I know that
> > the emitter LED is fine , with the help of Radio Shack
> > Infrared sensor card. can anyone give me any hints as
> > to how to get the sharp detector to see the radiations
> > or maybe do it with the help of any other detector also.
>
> The Sharp IR detector is designed to respond only to modulated IR signals.
> The card from Radio Shack will indicate whether the LED is illuminated,
> but it won't tell you whether it's modulated at the proper frequency.
> Perhaps that could be the problem? Just a guess. Good luck!
>
> --Will
Hi Will:
What you say might be the reason for my problem hence I bought a
matched IR emitter and detector pair from Radio Shack and tried the
same thing. Here again, the emitter is sending the signal but
the detector is not able to see it. I tried connecting the receiver
to a digital port directly without any resistor and analysing the
input from the port by using the digital(int) function. It did not
show any level change. Basically, I am trying to
implement something similar to the REC 80 routines by Danny Negro
and Max Davies' work. I hope to be able to transmit the codes
from the IR transmitter of one handyboard and have another HB
receive and decode the signals. I even tried Sriram's code (I got
it from the HB mailing list archives ) which
sends out a signal similar to that sent out by the sony remote but
the Sharp Chip was still not able to receive/decode it.
Another question I have is, if I want my handyboard to send signals
in different directions, do I need to have as many detectors as
emitters or one detector will do?
Thanks for your help.
Raj.
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Message has 1 Reply:
 | | Re: IR Detection
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| Transmission and reception of IR data is quite different from using IR just to bounce it off obstacles to detect their presence. To exchange data with IR you will almost certainly have to use interrupt driven assembler code which can be very (...) (26 years ago, 30-Oct-98, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Re: IR Detection
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| (...) The Sharp IR detector is designed to respond only to modulated IR signals. The card from Radio Shack will indicate whether the LED is illuminated, but it won't tell you whether it's modulated at the proper frequency. Perhaps that could be the (...) (26 years ago, 30-Oct-98, to lugnet.robotics.handyboard)
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