Using an arduino nano as a ibus or sbus sensor

And if you want help, please read the sticky post at the top about how best to use this forum which includes posting your code (or attaching it if too big) as well as posting your error messages, etc. Nobody is going to follow some other link to an old post to download someone else's code to see if it compiles are not.

It would be best to post all those things here, in this thread so others can easily see/copy/compile and possibly help.