10x4 matrix keyboard using only portB

[aratti]

Here the updated version of software and hardware.

It was necessary to pulldown the rows as well (4x5K resistors) in order to avoid floating inputs. It has been tested and it works.

If you have downloaded the file from the previuos post please discard them and download the updated file from this post.

Thank you again to Darel, and sorry for the inconvenience to all the members of the forum that have visited my post.

Al.