On Fri, 29 Mar 2019 14:20:48 -0400, Dennis Lee Bieber wrote:
>
>  Typically these suffice until you get to maybe 3 buttons pressed
at
> once -- if two buttons are on the same row and two are on the same
> column, you get a phantom button press for the other row/column
> intersection.
>
known as ghosting and can be prevented by the use of a diode for each
switch.

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