Robotics : 6535


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Subject:	Re: touch sensors aren't just switches (was Re: ideas for a RIS 2.0
Newsgroups:	lugnet.robotics
Date:	Wed, 25 Aug 1999 02:54:36 GMT
Viewed:	891 times

In lugnet.robotics, lego-robotics@crynwr.com (Tilman Sporkert) writes: > Many "buttons" in today's electronic devices are designed that way. Check > your TV remote control, your key-chain remote control for your garage door > opener or car alarm, the buttons on your phone etc. It eliminates the need > for a physical switch. All you need is a pair of copper pads under each > button. These are just part of the normal circuit board that you need > anyway. The rest is a hole in the cover, a piece of plastic ("the button"), > a spring, and a small piece of conductive rubber. 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. Regardless, it seems to me that I'll do better making real switches. I was planning on doing debouncing in software anyway (although I'd really rather have gray coding in the multiplexer so I don't have to worry about that either :-) Anyway, thanks for your responses and good explanations. - Robert Munafo http://www.mrob.com/ LEGO: TC+++(8480) SW++ #+ S-- LS++ Hsp M+ A@ LM++ YB64m IC13

Message has 2 Replies:

		RE: touch sensors aren't just switches (was Re: ideas for a RIS 2.0
(...) 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! Well, if you were switching a really high voltage through a small switch, you would get (...) (25 years ago, 25-Aug-99, to lugnet.robotics)

		Re: touch sensors aren't just switches (was Re: ideas for a RIS 2.0
(...) You can still get keybounce on rubber buttons. Perhaps there is a special design that would eliminate keybounce entirely, but in my experience some degree of debouncing is still required. I believe the transition is a more gradual one since (...) (25 years ago, 25-Aug-99, to lugnet.robotics)

Message is in Reply To:

		RE: touch sensors aren't just switches (was Re: ideas for a RIS 2.0
(...) Many "buttons" in today's electronic devices are designed that way. Check your TV remote control, your key-chain remote control for your garage door opener or car alarm, the buttons on your phone etc. It eliminates the need for a physical (...) (25 years ago, 25-Aug-99, to lugnet.robotics)

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