Subject:
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Re: touch sensitive sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 28 Dec 2003 20:36:27 GMT
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Viewed:
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1176 times
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Instead of pressing the touch sensor directly, you could use a lever to
press it, thereby giving more precision.
"Øyvind Steinnes" <phoenix@online.no> wrote in message
news:HqCGJ5.Gz@lugnet.com...
>
> "Philippe Hurbain" <philohome@free.fr> wrote in message
> news:HqCD5y.1M6C@lugnet.com...
> > In lugnet.robotics, Øyvind Steinnes wrote:
> >
> > > Then you have a difrent set of switches than me. Mine only gives out a
> > > shorten curcuit when pressed and a open connection when not pressed. • There
> > > are no resistance between the two stages. This are switches from the • 1.5
> > > set, maybe the new one from the 2.0 set is diffrent? Have to take • apart
> my
> > > robot and test them too....
> > >
> > > The way I'm testing them is by connecting a multimeter to the switch
> > > connector and slowly press the button in. It just goes from nothing to • 0
> ohm
> > > in no seconds.
> >
> > Are you sure your multimeter is up to the task? I have measured numerous • touch
> > sensors (from 1.5, 2.0 and cybermaster), all of them have a high value • when not
> > pressed (open for RIS 1.5 and 2.0, 10 to 15KOhm for Cybermaster that • have
> a
> > parallelded resistor). When pressed all of them decrease to about 500 • Ohm,
> the
> > variation occurs on a 0.05 mm course. See the variation curve here:
> > http://www.brickshelf.com/cgi-bin/gallery.cgi?i=514059 (folder here:
> > http://www.brickshelf.com/cgi-bin/gallery.cgi?f=56439)
> >
> > Philo
>
> Thanx for the info. But 0.1mm is not much travel distanse and the only
> usable area is around 0.005 to 0.02mm and that is WAY too sensitive.
> Does anyone know exactly what the RCX switches are made of? The one I • opened
> (from the 1.5 set) looked like a carbon-based (not sure if that is the
> exactly right English word for this) switch where the contact is made of
> carbon based plate that makes contact between to copper plates. That will
> also explain why there is no instant contact, the carbon is on a rubbery
> form of plate that will make contact in a small spot until it is pressed
> firmly in.
> This I know from the radio's and TV's I have repaired so far...
>
> But this type is no use for a robot's tuching fingertips. It will be too
> difficult to find the middle value, e.g. the value changes to quickly...
>
> What I was intrested in was a switch that worked in a more linear fashion
> from lets say 10 kOhm to 100 Ohm or less from fully open to fully closed
> switch.
>
>
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Message is in Reply To:
 | | Re: touch sensitive sensor
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| "Philippe Hurbain" <philohome@free.fr> wrote in message news:HqCD5y.1M6C@lugnet.com... (...) There (...) my (...) ohm (...) touch (...) when not (...) a (...) the (...) Thanx for the info. But 0.1mm is not much travel distanse and the only usable (...) (21 years ago, 23-Dec-03, to lugnet.robotics)
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