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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Tue, 23 Dec 2003 10:45:26 GMT
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Viewed:
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1050 times
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"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 has 1 Reply:
 | | Re: touch sensitive sensor
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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... (...) 1.5 (...) apart (...) 0 (...) have (...) Ohm, (...) (21 years ago, 28-Dec-03, to lugnet.robotics)
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Message is in Reply To:
| | Re: touch sensitive sensor
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| (...) 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 (...) (21 years ago, 23-Dec-03, to lugnet.robotics)
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