Subject:
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Re: touch sensors aren't just switches (was Re: ideas for a RIS 2.0
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 25 Aug 1999 21:47:12 GMT
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Viewed:
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877 times
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In lugnet.robotics, Ralph Hempel writes:
> > I think it also removes the need to eliminate "keybounce", the annoying
> > thing that happens with real switches due to dirt on the contact
> > surfaces and tiny arcs (sparks) just before initial contact.
>
> The actual source of bounce is NOT the arc just before contact. It
> actually is the bouncing of the contact due to the action of the spring
> in the contact!
That obviously depends on what type of physical design is used for the switch.
Some switches are not capable of bouncing the way you describe because there is
no impact or acceleration during contact (example: slide switches that move
leaf springs across traces on a PCB -- many linear and rotary
multipole-multithrow switches are built that way)
And of course, some switches do. So, if you wish to be complete, you should add
"actual physical vibration" to the other causes ("dirt" and "arcing") that I
mentioned.
- Robert Munafo http://www.mrob.com/
LEGO: TC+++(8480) SW++ #+ S-- LS++ Hsp M+ A@ LM++ YB64m IC13
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