Here is an interesting challenge for you: I have only 4 digital I/O lines left on my Arduino; the others were taken up by other things. I was wondering if there is a way, using minimal external circuitry, to read 5 buttons with these 4 I/O lines, assuming I have power and ground as well?

How to read 5 buttons with only 4 I/O lines

Grumpy_Mike June 7, 2014, 4:13pm 8

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