Input / output using same pin

[HenrikOlsson]

Hi,
Yes that would work. The drawback is that the LED will be ON while you push the button.

/Henrik Olsson.

[Melanie]

You don't actually need R1 as R2 via the LED will pull the pin high during the input mode, and all it will do is add extra unnescessary load to the I/O pin during output mode..