The ATmega$328$P has an Analog$-$to$-$Digital converter with $-$bit resolution. $($Write a number$)$

When we connect a low$-$voltage sensor to an analog input, we can improve the sensitivity by feeding the ADC with an external reference on the pin pint$)$

Now, complete the following code which Teads an analog signal and uses it control the brightness of an LED.

Int anntogrin $=A$ :

int tedPin$=9$;

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$1$

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$0($ int $$

$14$:

$($ledPin$,$ digitarValue$)$: $)$

Assume the pin analogPin is connected to $4$ volt.

digitarValue would be in this case $$