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 17:37:31 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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988 times
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I had intended the two types of interfaces for different purposes, but, I
assume RF does not need line of site work. R/C cars for example can be
controlled from several rooms away in my house (worked with one on a
telepresence implementation). I assume this is the same type of modulation
the Linx units would use. I have also worked with using a laptop and a
wireless Ethernet card to communicate back to another workstation. This
worked well, and the transmissions would pass through walls, floors, and
ceilings. However, I have yet to build a robot base that is suitable to
accommodate the laptop system, batteries and such.
Todd
-----Original Message-----
From: MAR ERICSON [mailto:mar@cooper.edu]
Sent: Thursday, February 25, 1999 11:24 AM
To: Graham, J. Todd
Cc: Handyboard
Subject: RE: IR outputB
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.
-----------
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 Thu, 25 Feb 1999, Graham, J. Todd wrote:
> 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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