Subject:
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Re: Train Sensors
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 31 Dec 1999 21:23:45 GMT
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Original-From:
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The WordMeister <dwilcox@wordsmithdigitalIHATESPAM.com>
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Viewed:
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610 times
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Took a while to answer your request, but here it is.
--Doug Wilcox
**********************************************
As promised, here's a picture of the working train sensor we used for the
Orange County Festival of Trees to control two 4561 Railway Express trains.
When the train passes, the 5 sided flat piece is pushed inward. The short
axle attached at 90 degrees (hidden from view) then pops off of the touch
sensor (hidden under the 2 x 4 thin at the top and the 2 4x1 thicks. The
long axle at the top is a deadweight whose purpose is to push the 5 sided
piece back out when the train is gone. The 2 x 4 thin at the top serves as a
stop to keep the short axle aligned on the yellow spot on the touch sensor.
The 1 x black pieces under the two long black beams are also Technics beams.
The two shorter beams, in concert with the longer beams, help provide a 1/2
bump offset between the sensor and the long beams so that the short axle
length is exactly right (except for some filing for smoothness). You can
attach this sensor to a RR tie with a rectangular brick. As mentioned
previously, if you use new parts, the long beams tend to "pop" off the short
beams after a while because they are a little slippery. You can over come
this with glue, older bricks, or more bricks. There is room for exactly 11
thins between the bottom of the assembly and the bottom of the 5 sided
brick, which makes this arrangement work great with the Railway Express.
Note that LDRAW truncates the wire from the wire brick so that it looks here
like a short axle. The view above also shows how the touch sensor is offset
1/2 bump from being evenly aligned with the ends of the 7-hole beams.
-Ted Michon
-----Original Message-----
From: Barbara Nostrand <nostrand@bradley.edu>
To: lego-robotics@crynwr.com <lego-robotics@crynwr.com>
Date: Thursday, December 30, 1999 1:26 PM
Subject: Train Sensors
> Hi.
>
> Does anyone still have the text portion (I have the jpegs)
> of the note on touch sensors for trains? (I accidentally
> deleted the text.)
>
> Barbara Nostrand
>
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