Subject:
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The IR BALL
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 31 Aug 2000 03:52:42 GMT
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Original-From:
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Patel <hhppatel@md4.vsnl.net.!NoMoreSpam!in>
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Viewed:
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604 times
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Hi There , below is a mail i got
i wanted some info in the end..
we used a simple transparent plastic ball with a diameter of 4-5cm
(about 1,5 inches), which contained the IR-emitting LEDs and their
batteries. As far as I can remember, the circuit was very simple, and we
put *a lot* of IR LEDs because we soon discovered that the critical
point of the whole project is to have the robot locate the ball with
sufficient accuracy. You see, an IR LED pointed to the ground is no way
good and the detection range of the standard Lego light sensor is not so
wide. I seem to remember that we also put some non-IR LEDs in the ball,
but you'd better ask Marco Berti (marco.berti@itlug.org) who built the
ball and who is, by the way, an expert in batteries.
It's also very important to have the right environment, as the IR light
can be easily reflected by the background or by other objects, and
hamper the good behaviour of the robots. We also put a black/white
gradient sheet in the playing field, just under the robots, to let them
easily (?) find their way in the right direction.
This project seems very intresting
Can you tell me how to build this ball with IR leds?? ??
what are the requirments and how will the lego detect the signals?? from the
ball???the programming bit also.
Dr Patel
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Message has 1 Reply:
 | | Re: The IR BALL
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| (...) Hi As Mario and Giulio made my name I have been forced to beat my laziness and upload some picture of the IR emiiting ball (sorry it has not been made with Lego parts!) and of the robots. You may find the ball picture here (URL) The real (...) (24 years ago, 30-Aug-00, to lugnet.robotics)
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