Further Investigations
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Is the light sensor measuring all of
the time? To test this, aim it at a light
source, like a lamp. Move your hand in front
of it. Can you move your hand so fast that
the probe doesn't detect it?
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Try to imitate the way a sensor sees
things. Close your eyes. Count to two. Open
them for a split second (a quick blink).
Close them and count to two again, then open
them for a split second. Keep doing this, so
that you see just for an instant every two
seconds. After you learn how to do this,
try it while walking around. Try it while
drawing with a pencil. Is it hard? Describe
what it's like. If this is the way your eyes
worked, could someone sneak up on you?
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Try to improve your light sensor's
ability to find things. Build a detection
helper for your light sensor that will make
it more able to locate a light source, like
a flashlight or a lamp. One option: use
heavy paper and aluminum foil and tape. Test
it using a light source. Draw a picture of
your direction detector. Label the picture
to explain how it works.
Copyright 2005 The Concord Consortium, All
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