Dwayne Reid wrote...

>Close, except turn the diodes around.

The diodes are connected properly.

If you go back and read my earlier post, which explains in detail how
the circuit operates, that should clarify things.  The function of the
diodes is to isolate the column lines from the row lines, so that the
storage capacitors can be forcibly pre-charged to a HIGH directly by the
PIC, but can only be discharged through an activated key. =20

There's more to it than that (see the step-by-step operating sequence),
but that's the diode function in a nutshell.

Dave

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