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LPT Switch

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Grasshopper:

--- Quote from: Trimoor on December 22, 2004, 02:03:10 pm ---If you remember the KE series keyboard encoders, some of them use matricies.
Ghosting can be avoided by sequentially scanning the matrix instead of waiting for a button to be pressed--interrupt vs. polling.

From the site: (translated)

--- Quote ---it does not have problem of ghosting (keyboard keys ghost), as in hack of keyboard
--- End quote ---
Here is a translated link:
Translated

--- End quote ---

Unfortunately, I don't believe that's true. The only way to avoid ghosting is to use diodes.

brained:
Trimoor, I've bought all the materials to build one. I'll give it a try this weekend and let you know how everything did. I hope it works, 'cause it seems to be a very simple device to build, and cheap too.



Hoagie_one:
what does the red arrow with a bar pointing down mean in teh diagram?

Thenasty:

--- Quote from: Hoagie_one on January 07, 2005, 02:26:03 pm ---what does the red arrow with a bar pointing down mean in teh diagram?

--- End quote ---

DIODES

Hoagie_one:
thanks.  what about the little yellow dots after teh diodes?

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