Subject:
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Re: Reed sensors are not working very well (or too well?)
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Newsgroups:
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lugnet.org.ca.vlc, lugnet.trains
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Date:
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Tue, 7 Aug 2001 22:28:38 GMT
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Viewed:
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47 times
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In lugnet.org.ca.vlc, Dean Husby writes:
> I've finished the reed sensors for the Trolley line. Work fantastically!
>
> I've also finished the reed sensor for the Hogwarts. Not so good.
>
> In my tests I used a single car to test the sensor to make sure the
> magnet couplers did not set off the sensor while the intended one did.
> Worked well. Now, however I tried a string of cars and AHHH, when two
> magnets are together they trip the sensor!
>
> Most nasty. I'm attempting to dampen the sensors ability while making
> sure it works for the intended use...
I have found that reed switches are very sensitive to the orientation of the
magnet and switch. If you lay the reed switch lengthwise along the track,
it is sensitive to the couplers between trains, especially between cars
where there are two magnets linked together. However, if you simply turn
the reed switch, and lay it _across_ the tracks, it will not be closed by
the coupler magnets, since they are oriented along the wrong axis. You can
then affix a magnet (or two) sideways across the bottom of a train to
actually trip the reed switch.
I hope this info isn't coming too late to help...
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