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> a freely rotating magnet is placed in front of
> the LED of a light sensor. It casts a shadow onto a white brick in a
> light-proof box. The sensor detects the shadow, which varies (in my
> case) from a reading of 32 (horizontal) to 43 (vertical). A second,
> fixed magnet positioned a short distance from the sensor magnet causes
> the sensor magnet to revert to horizontal after a train passes.
Jeff, I'll admit that as a train thing I had minimal interest, but for
some reason the idea percolated in my brain and I cant help but try to
figure out some sort of robot application for this.
Chris
Why do solar calculators have an off button?
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Message is in Reply To:
 | | RCX Train Sensor
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| I was languishing at home today with a cold, and I got to thinking about running trains with an RCX. I've been dreaming of having one or two trains automated to pull into a station, wait, pull out again, etc. But all this hinges on having the RCX (...) (21 years ago, 2-May-03, to lugnet.org.ca.rtltoronto, lugnet.trains)
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