Subject:
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Re: Multiplexing 4 touch sensors on an RCX input port
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Fri, 12 Sep 2003 01:10:24 GMT
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Viewed:
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4160 times
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Tim Auton wrote:
> This has always annoyed me about the Lego touch sensors. Has anyone
> ever made or seen a contraption that uses the variable pressure
> sensitivity of the Lego touch sensors?
>
>
> Tim
I've made one. A wall follower. I set the sensor to raw mode and looked at three
ranges. It tried to stay in the middle range, which for this 'bot meant lightly
touching the wall. The wall follower had a bumper analogous to a highly curved
(180 degrees) insect feeler. The touch sensor was oriented vertically and the end
of the feeler nearest the 'bot moved horizontally over the bump on the sensor. I
think I used a technic #3 angle connector ( http://www.peeron.com/inv/parts/32016
), with the pin hole as the pivot point of the feeler and the side of one of the
ends moving over the bump of the sensor.
IIRC, the ranges I used were around 0-200, 201-900, 900-1023. The sensor's values
tended to hover around 0 at no contact, 950+ at high contact, and 350-500 for
light contact.
-Brian
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