Subject:
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Re: Design wanted: Touch sensor for passing trains
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Newsgroups:
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lugnet.robotics, lugnet.trains
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Date:
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Wed, 29 Dec 1999 02:39:19 GMT
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Viewed:
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46 times
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In lugnet.trains, Carl M. Kadie writes:
> I'm using Mindstorms to control Lego trains.
>
> Does anyone have a design for using a touch sensor to detect a train
> passing?
>
> My intuition is that the touch sensor could be more reliable than the light
> sensor (plus I have two touch sensors and only one light sensor).
I don't have a design, but I do have a comment, to wit:
With a touch sensor you are committing to a fixed dimension SOMEWHERE unless
you get quite clever. It may be in the width of the vehicle, it may be in the
height, it may be the depth of some part of the undercarriage, etc. but
something has to be fixed. Else you have to use quite esoteric whisker based
approaches, which may be somewhat hard to hide in trackside buildings etc.
A light sensor, on the other hand, requires only the committment that you will
at some point block at least a certain silhouette.
Find the bunyip site for some (pre mindstorms) work on trains and sensors.
++Lar
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