Subject:
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Re: Sensors
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 16 Feb 1999 12:39:41 GMT
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Viewed:
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1241 times
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On Tue, 16 Feb 1999 07:06:31 GMT, lego-robotics@crynwr.com wrote:
> I ordered a "sensor & motor" pack from Gleason Research, and it
> came with 4 touch switches. Two of these were simply keys from
> a computer keyboard. Looks like they will work just fine. So old
> computers may be a source for a large number of touch switches.
Beware. Little to no keybards actually include separate switches.
Most keyboards available today use two sheets of plastic with
electrical pathways on them, whioch are connected beneath the keys
when pressed. Older ones often have a PCB with copper islands that are
connected by a bit of tinfoil when the key is pressed. In fact, I have
only in one instance seen keyboards with separate switches: BBC
Microcomputers used 'em. However, if you find a BBC, and tear upo the
keyboard for this, mail me the motherboard - and a return address for
the mail-bomb that would deserve .... :-/
Jasper
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Message has 2 Replies:
 | | Re: Sensors
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| (...) Old PCs with very klicky keyboards generally used ALPS-brand key switches. IBM keyboards are the classic brand here, but I've had NEC keyboards of the same design, and the old Northgate Omnikeys also used ALPS switches. You are correct though, (...) (25 years ago, 16-Feb-99, to lugnet.robotics)
| | | Re: Sensors
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| (...) Jasper - for newer keyboards this is true - but your probably showing your age here :) Most of the early keyboards were discrete switches (Apple, Dec, IBM) It was after a while that the 'film' switches became available. I've had 1,000s of the (...) (25 years ago, 16-Feb-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: Sensors
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| (...) I ordered a "sensor & motor" pack from Gleason Research, and it came with 4 touch switches. Two of these were simply keys from a computer keyboard. Looks like they will work just fine. So old computers may be a source for a large number of (...) (25 years ago, 16-Feb-99, to lugnet.robotics)
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