Question: Let's say you wrote a line, val = analogRead ( 1 ) ; What does the number 1 in the parenthesis refer to ? Read

Let's say you wrote a line,
val=analogRead(1);
What does the number 1 in the parenthesis refer to?
Read the data every 1 second
Analog pin 1
Read 1 byte of data
Read 1 bit of data
Digital pin 1
 Let's say you wrote a line, val=analogRead(1); What does the number

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