 | | touch sensors aren't just switches (was Re: ideas for a RIS 2.0
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(...) Wow. That's pretty darn disappointing. I even bought extra touch sensors to use in multiplexed designs (but I haven't made the multiplexer yet). I guess I'll have to build some of my own touch sensors... I wonder why LEGO designed the touch (...) (25 years ago, 25-Aug-99, to lugnet.robotics)
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| | RE: touch sensors aren't just switches (was Re: ideas for a RIS 2.0
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(...) 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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| | RE: touch sensors aren't just switches (was Re: ideas for a RIS 2.0
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(...) As you may guess, cost is the driving factor. In one project for a desk fan (it's the Brookstone Battery Operated Desk Fan in case you care) the rubber switch for three buttons and custom molding cost 8 cents! per switch in quantity 20,000. (...) (25 years ago, 25-Aug-99, to lugnet.robotics)
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| | Re: touch sensors aren't just switches (was Re: ideas for a RIS 2.0
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(...) 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 (...) (25 years ago, 25-Aug-99, to lugnet.robotics)
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| | RE: touch sensors aren't just switches (was Re: ideas for a RIS 2.0
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(...) 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)
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| | Re: touch sensors aren't just switches (was Re: ideas for a RIS 2.0
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(...) 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)
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| | Re: touch sensors aren't just switches (was Re: ideas for a RIS 2.0
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(...) 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 (...) (25 years ago, 25-Aug-99, to lugnet.robotics)
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| | Re: touch sensors aren't just switches (was Re: ideas for a RIS 2.0
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Any motion between two hard surfaces, including sliding metal on metal (often called contact wiping), creates intermittent contact that has to be "debounced". The only switches that don't bounce are mercury-wetted contacts, such as one used to find (...) (25 years ago, 25-Aug-99, to lugnet.robotics)
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