Subject:
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Touch Switch 2974
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sat, 28 Jun 2003 20:02:04 GMT
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Viewed:
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2791 times
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"Philippe Hurbain" <philohome@free.fr> wrote:
> > http://www.brickshelf.com/gallery/markril/Misc/touch.jpg
> >
> > without checking the resistance (yeah, I know it looks
> > different, but you never know... :-)
>
> indeed, the construction of this beast may be very different (e.g. • metallic
> contact, 0 resistance... and a lot of bounce almost completely avoided • with
> conductive rubber)
I was fortunate enough to find one of these on BrickLink and
it just came in today. It turns out the resistance is 2.2K and I
suspect the contacts are metal since the resistance doesn't seem
to vary with pressure. It's an open circuit when the actuator
is not pressed.
Since the resistance differs from touch switch 879, it's easy to
determine which is pressed when both are hooked up in
parallel to the same sensor input.
Mark
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Message has 1 Reply:
 | | Re: Touch Switch 2974
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| (...) Did you try to test contact bounce ? since there is a rather high value resistor, perhaps Lego added a small capacitor too to debounce it? Philo www.philohome.com (21 years ago, 29-Jun-03, to lugnet.robotics.rcx)
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