----=_3c66bd371940967046c3949.MFSBCHJLHS Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Edson Brusque wrote... > Let's say no keys are pressed. You've charged all the caps with = current >passing through the diodes, then you havn't discharged any caps because = no >key are pressed when you turned RD4 LOW. Then you have RD7:RD4 as inputs >reading LOW, because no current passes from the cap to the port by the = keys. >No current also passes through the (now reversed) diodes. > > How can this work? It doesn't. Darn it, I had pullup resistors on the port pins in this design when I went to bed last night. But when I got up this morning I couldn't remember what the heck I'd put them in there for. So I took them out. Now I know why they were there in the first place. Attached is the corrected design, with pullups included. 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