Subject:
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RE: Design wanted: Touch sensor for passing trains
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 29 Dec 1999 19:50:57 GMT
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Original-From:
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Russell C. Brown [RR-1] <RCBROWN@AUSTIN.RR.avoidspamCOM>
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Viewed:
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2515 times
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What about hiding the reed switch in a small electrical brick (like a
lighting brick) or a motor casing and hiding the magnet inside another
brick? The pair could be a good replacement for the touch switch in
imprecise applications like bumpers.
--
Russell C. Brown
mailto:rcbrown@austin.rr.com
> -----Original Message-----
> From: Pete Sevcik [mailto:sevcik@flash.net]
> Sent: Wednesday, December 29, 1999 12:01 PM
> To: Dave Baum
> Cc: lego-robotics@crynwr.com
> Subject: Re: Design wanted: Touch sensor for passing trains
>
>
> I have used a magnetic reed switch to detect trains.
> Glue a small magnet to a lego piece, and mount on the train. Cut
> a Lego wire in
> half, and solder a reed switch to the cut end.
> This detects the train with precision, and is not affected by
> shadows. Also
> costs a lot less.
>
> - pete.
>
>
>
> Dave Baum wrote:
>
> > FWIW
> >
> > I haven't tried this yet myself, but its very typical to use • light sensors
> > for this sort of thing in HO scale model railroading. There • are a lot of
> > advantages to "contactless" detection. On the down side, you need to
> > minimize interference from ambient light, etc.
> >
> > Usually for HO scale stuff the IR LED and IR detector are • separate pieces
> > (one on each side of the track). This makes for a nice point-to-point
> > beam that gets interrupted by a passing car.
> >
> > Some find this ugly, so another approach is to bury a passive • light sensor
> > under the track pointing upwards. A passing train will cause a shadow
> > over the sensor.
> >
> > Dave Baum
> >
> > In article <FnHCMC.KzF@lugnet.com>, "Carl M. Kadie" • <carlk@msn.com> wrote:
> >
> > > 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).
> > >
> > > Thanks much for any help,
> > >
> > > Carl Kadie
> >
> > --
> > reply to: dbaum at enteract dot com
>
> --
> Pete Sevcik sevcik@flash.net
> Techno-stuff Robotics
> http://www.flash.net/~sevcik/
> Robotics for FUN !
>
>
>
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Message is in Reply To:
 | | Re: Design wanted: Touch sensor for passing trains
|
| I have used a magnetic reed switch to detect trains. Glue a small magnet to a lego piece, and mount on the train. Cut a Lego wire in half, and solder a reed switch to the cut end. This detects the train with precision, and is not affected by (...) (27 years ago, 29-Dec-99, to lugnet.robotics)
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