Subject:
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tuch sensitive sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 22 Dec 2003 14:13:03 GMT
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Viewed:
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896 times
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Hello folks,
I just come up with an idea, maybe there is a sensor like this made
already...
I'm thinking of a tuchsensitive sensor. Not the on/off type or with only one
resistor value. I'm thinking of a tuchsensor that can register how far the
button is pressed with an analogue value.
Technicaly this can be done by mounting a small varialble resistor (pot)
onto a pin or rack of somekind that rotates when the button on the
tuchsensor is been pressed in? There is some other types of pot that is not
rotating but are moving in a line. Have not yet seen those in a small size
that will fit into a 2x3 tuchsensor brick type of housing.
Got the idea?
The problem for accuracy is the reading from the RCX, if it is only reading
the sensor each 3ms it will only register tuch on the sensor from min to max
when it is been pressed with 3ms or less time from outer possition to inner
possition.
There are many aplication you can use this type of sensor for. Like a robot
that should grip something, and you dont want it to grip to hard. Use those
tuchsensitive sensors on the "fingertips" on the robotic arm and it can
"feel" when the fingers are tuching something and know how hard its grip is.
Another aplication is a piano. Tuchsensitve sensor under each keys, and the
piano knows how hard (fast) you have tuched the keys and kan make the volume
of the tones acording to that.
I've looked around on websites but cant find any sensor like this.
Is there one already out there someplace? Or maybe someone is up to the task
to make some? Do this sounds intresting at all?
Regards
Øyvind Steinnes
http://www.brickshelf.com/cgi-bin/gallery.cgi?m=Phoenix
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Message has 4 Replies:
 | | Re: tuch sensitive sensor
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| (...) one (...) Regarding the raw sensor technology to measure the force pressing on a button, a spring-loaded potentiometer is one solution. Other potential solutions include piezo-resistive sensors, a strain-gage mounted on a moment-arm, or even (...) (21 years ago, 22-Dec-03, to lugnet.robotics)
| | | Re: tuch sensitive sensor
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| In lugnet.robotics, Øyvind Steinnes wrote: <SNIP> (...) all analog? They seem to do exactly what you are talking about, but maybe there is some better processing going "on under the hood"? I wonder if you can pick up an old controller off of e-bay (...) (21 years ago, 22-Dec-03, to lugnet.robotics)
| | | Re: tuch sensitive sensor
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| (...) The cheaper music synthesisers (and perhaps the expensive ones too) do this by having two simple switches - set to switch at different points in the key's travel. All they do is measure the time between the first switch triggering and the (...) (21 years ago, 22-Dec-03, to lugnet.robotics)
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