Can a keypad share pins with the bus to an LCD?

What about keypresses? How do you keep them from interfering with the LCD
comms?

Nuno.

Bob Blick wrote:
>
> I don't see why you need all those extra parts. 13 pins is plenty for what
> you said. The keypad and LCD and 3 LEDS and even the piezo buzzer can
> share pins. I bet you can do this with 12 pins total, including your 2
> wire comms. You don't need a shift register. Your LCD accesses are fast
> enough the LEDs will barely tickle. Or put a small cap across each one to
> get rid of that. The piezo should probably take the 13th pin though. Even
> if you use the LCD register select pin, the piezo make tiny noises that
> will be audible.
>
> Cheers,
> Bob

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