Help reliably reading switch on long wire

With a 10k resistor in place of the 22R

No but you could push it up to 330R.

and a 0.1uF in place of the 100pF?

Yes.

Then use a 1k resistor as a pullup rather than a pulldown?

Yes.

should this resistor be located to the left of "outside world" in the image from your site?

No have the pull up directly onto the arduino pin.

I know these are basics questions

No problem with that. :slight_smile:

thanks to help on forums like this one!

It's a good place to be.