Hi. I wnat to change _CYCLES_PER_US using potentiometer but every time when I try - I have an error: multiple definition of ...
I' d like to know ways of changing this one with any details.
You can't change a macro at runtime.
Post your description of what you want to do, and post your code.
Be aware that an analogRead takes longer than a TV line.
Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advice on) your project 
See About the Installation & Troubleshooting category.
One can quite easily create a non-blocking analog read
I know that, but the OP doesn't, or they wouldn't be confused about macros
Why do you want to give the code incorrect information about the system clock speed?
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