I want to use many (about 30) switches as inputs to my Arduino Uno. I've built a circuit using four 74LS30 (nine input NOR gates) to multiplex 15 switches down to 4 pins (16th state is when all switches are off, 0000) which works. However, expanding this to accept inputs from more switches will mean…

Reverse multiplexing

Henry_Best April 30, 2012, 2:49am 13

Thanks for the info. I'm thinking of using 74HC4067Ns but I don't know if my local electronics store in London has them. Mail order will probably incur more shipping charges than the value of the parts

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Reverse multiplexing

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