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I am happy that it was useful
Your problem is the "LiquidCrystal_I2C.h" library.
What you have is different from what I use.
Download and install this: https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
Let me know.
Always at your disposal.
it's a good idea
I would use:
int val = analogRead(0);
frequency = map(val, 0, 1023, 88.5, 108.5);
You have to do some tests
Let me know
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