SadAlphaMiks:
I need to set the sample rate in the Arduino UNO board itself. And this is not my program, I found it, but it seems that it does not work
That is not an answer to Reply #3.
There isn't any such thing on an Arduino Uno as "the sample rate". But you can program it to do things at a specified interval.
Saying that a program "does not work" does not convey any useful information with which to help you. Tell us what the program actually does and what you want it to do that is different.
...R