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on a keyboard matrix you get a bunch of keys all with a common node. This cuts down on wiring. UK_MP3car has combined his steering wheel controls with a keyboard matrix to control his PC. The pug controls had 4 swtiches and 5 wires - ie one common node for all swtiches. Otherwise you would need 8 wires. But you have to poke around and fine enough switches with a common node.
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or skiing or diving or doing somthing else fun!
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