Subject:
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Re: IR Subsystem confusions.
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 28 Mar 1997 03:55:03 GMT
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Original-From:
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MAR ERICSON <MAR@COOPERstopspammers.EDU>
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Viewed:
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1532 times
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Does the HB have demodulationg circuitry? According to the diagrams, the
Sharp IS1U60 is connected to TIC1 on the HC11. Does this mean that the
HC11 is doing the demodulation? Is the Sharp IS1U60 an IR demodulator, or
simply and IR receiver? I thought demodulation circuitry is a little more
involved than figure 9.6 (Infrared Reception) of the HB Tech Ref.
Anyway, does the IR reception part of the HB have to operate at 40KHz?
-----------
ericson mar
Master of Engineering Candidate
Project: Mobile Robotics
mar@cooper.edu
(212)353-4356
Department of Mechanical Engineering
The Cooper Union for the Advancement of Science and Art
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On Thu, 27 Mar 1997, Fred G. Martin wrote:
> In your message you said:
> > What was/is the purpose of the IR Subsystem on the Handy board.
>
> main purpose: allowing HB's to transmit IR codes that can be rec'd by
> other HB's or circuits.
>
> example -> let an HB run an IR beacon that can be found by another HB.
>
> sub-purpose: run IR transmitters for reflective IR obstacle detection.
>
> > What is the difference between the Sharp Demodulator and the one you get
> > from Radio Shack.
>
> not much. the HB one is smaller and runs at a slightly diff center
> freq (38 kHz vs 40 kHz for rat shack)
>
> >
> > How do you use the onboard IR demodulator as a digital input.
>
> if (peek(0x1000) & 4) == 0, then it's seeing IR.
>
>
> > Are there different kinds of IR Emiiters.
>
> IR LEDs have different optical wavelengths, but most are standardized
> on 940 nm. They also have different beam cone angles, varying from 20
> deg to 60 deg. Also they have diff power handling capacities.
>
> Typically you use a current-limiting resistor (47 ohms to 330 ohms)
> in series with the LED when connecting to the HB IR output.
>
> -Fred
>
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Message has 1 Reply:
 | | Re: IR Subsystem confusions.(Never Mind)
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| Oh never mind my questions. I read the other messages after this one and looked it up too. It now makes sense to me. Sorry. ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of (...) (27 years ago, 28-Mar-97, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Re: IR Subsystem confusions.
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| In your message you said: (...) main purpose: allowing HB's to transmit IR codes that can be rec'd by other HB's or circuits. example -> let an HB run an IR beacon that can be found by another HB. sub-purpose: run IR transmitters for reflective IR (...) (27 years ago, 28-Mar-97, to lugnet.robotics.handyboard)
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