Subject:
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RE: Custom Firmware, IR Problems, and Dead RCXs
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 28 May 2001 16:49:21 GMT
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Original-From:
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Jim Lee <jlee@proaxis.!StopSpammers!com>
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Viewed:
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568 times
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Ralph,
Thank you for painting a much clearer picture of the internal design of the
IR Tower. I agree with your observations, but have a question: Is the
processor in the IR Tower controllable (i.e. downloadable, like the RCX)?
If it is, then there's no reason to let the IR duty cycle get as high as
50%. You can keep the same baud rate and framing characteristics, but
modify the individual bits so that they only turn on for, say, the first 10%
of their allotted bit time. At the other end of the link, all that needs to
be done is to have the receiver sample each bit earlier in the cycle, during
the first 10% rather than near the midpoint. Of course, if the IR Tower and
RCX cannot be programmed to do this, then we're stuck with the design flaw
and your modifications would be entirely reasonable.
-Jim Lee
P.S. - I am fairly new to the group, so my apologies for not recognizing
your name and credentials - I thought you were a Lego newbie like me :-)
-----Original Message-----
From: news-gateway@lugnet.com [mailto:news-gateway@lugnet.com]On Behalf
Of Ralph Hempel
Sent: Monday, May 28, 2001 4:19 AM
To: lego-robotics@crynwr.com
Subject: RE: Custom Firmware, IR Problems, and Dead RCXs (long)
[...] snipped [...]
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Message has 1 Reply:
 | | Re: Custom Firmware, IR Problems, and Dead RCXs
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| (...) Actually, it's the computer itself that determines the duty cycle. This does mean that you could change the duty cycle, but you should be aware that it would be at the expense of noise immunity and would require a higher sampling rate from the (...) (23 years ago, 29-May-01, to lugnet.robotics)
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Message is in Reply To:
| | RE: Custom Firmware, IR Problems, and Dead RCXs (long)
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| (...) You are right, but the RCX and the tower are right at the hairy edge. The additional 50R impedance will leave the near mode essentially unchanged and I'll sacrifice on the high range. Start with the tower. If you use a 9V battery, the IR (...) (23 years ago, 28-May-01, to lugnet.robotics)
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