Subject:
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RE: IR outputB
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 25 Feb 1999 16:16:55 GMT
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Original-From:
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"Graham, J. Todd" <grahamjt@Maritz.com>
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Viewed:
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1126 times
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So, it seems like the short answer to this question is no one knows what to
attach to correctly and safely (to prevent HB damage) allow IR transmissions
from the HB :) I understand the receiving capabilities, as they are
documented and have routines and explanations enhanced by Max Davies.
However, there does not appear to be ANY documentation on how to install the
transmission circuit addition. The HB reference manual indicates that it is
not included in the default handboard construction, but should be documented
elsewhere in the documentation or online. I have yet find where that source
is. Perhaps the 6.270 documentation locations have some info on it.
On a seperate followup to the RF issues, it would seem (from my limited
knowledge) that one of the LinxTechnologies units would only need the serial
pin output to successfully send data from the HB to the interface/charger
board. I would guess if a large data stream was to be sent some type of
handshaking/negotiation might need to be implemented, but if I just wanted
to send a few bytes at a time as control signals, it should be an easy
implementation. Has anyone proceeded with more reserach into these RF
units?
Todd
-----Original Message-----
From: MAR ERICSON [mailto:mar@cooper.edu]
Sent: Wednesday, February 24, 1999 3:07 PM
To: Mike Howard
Cc: Max Davies; Graham, J. Todd; Handyboard
Subject: Re: IR outputB
Is the IR reciever on the HB the same thing as in the robot in MR:ITI book?
I though it would be different.
In any case, you can but...the reciever is more effective as a "wireless
communication" device that can recieve various IR codes which you
programm the HB to recognize.
You can buy a separate a demodulator for this purpose for pretty cheap.
It is designed to recognize one frequency of IR code. It should also
have an LED driver that pulses the LED at the specific frequency. You
can buy one unit at radio shack or so. It beats programming the HB and
moving the part, etc.
But I guess it depends on what you really want to do.
-----------
ericson mar
Robotics Consultant
mar@cooper.edu
(212)353-4356
Department of Mechanical Engineering
The Cooper Union for the Advancement of Science and Art
-------------------------------------------------------
On Wed, 24 Feb 1999, Mike Howard wrote:
>
>
> On Sun, 21 Feb 1999, Max Davies wrote:
>
> > In response to:
> >
> > > > What type of IR component do I need to attach to the Handyboard to • allow the
> > > > IR output to function?
> >
> > MAR ERICSON wrote:
> >
> > > You can connect an IR LED to it. Maybe you may need a series resistor • to
> > > limit the current through it as well.
> > >
> > >
> >
> > Could a hardware expert (Fred?) please give a more definitive answer to • this?
> > What value resistor should be used? After extensive IR use with just an • IR led
> > and no resistor my transmission circuit eventually died... I guess I • burnt out the
> > transistor but not being a hardware person I don't really know for sure.
> >
> > Thanks,
> > /Max
>
> o
>
> Hi
>
> Did anyone receive an answer to this. I ant to connect
> a Radio Shack (276-143) IR LED to the IR output and am wondering
> what resistance to use. Also, I saw a design in Mobile
> Robots..Inspirition where they use two IR LED (one on each side)
> and a IS1U60 receiver in the middle as a proximity detector.
> Is this possible on the HB? Can one connect two IR LED's
>
> to the HB and move the IS1U60 to the front of a bumber.
>
> Thanks for any advice
>
> Mike Howard
>
>
>
>
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Message has 1 Reply:
 | | RE: IR outputB
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| I heard that radio waves do not need "line-of-sight" like IR does. Can someone with more exerience verify or dispute this? It makes sense since longer wavelengths of EMR can bounce off surfaces easier. So maybe your Lynx device is better. ---...--- (...) (26 years ago, 25-Feb-99, to lugnet.robotics.handyboard)
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