' ' was not declared in this scope

Using Arduino Programming Questions
1

I'm tring to mess around with the serial.print function and would like to see the values from a potentiometer. However, I get a compile error 'val' was not declared in this scope.

image

This seems pretty similar to how they have it on page 59 of prject 4 in Project book but I still can't figure out what im doing incorrectly.

2

You declared "val" in the "setup()" function, so you can only access it within the "setup()" function.

3

Not there either.

4

Oh, you're right.

5

I get a clean compile with:

image

My concern is that every time this loops back it will reset the value to 0. Is this the case?

6

Yes. You need to define "val" as a global variable if you do not want that.

7

What's wrong with a simple

int val = analogRead (pin);

?

(Please - posting pictures is just a waste of time. Post code, in code tags)

8

Would that be a problem?

You might also do this

int val = analogRead(....
9

I don't think that would be a problem to use it that way.

I was using the Project Book as a reference point for the last time I did an analogRead.

Thanks for the suggestion on using code tags; as I'm just beginning to learn the Arduino hardware and software, I'm also learning the formatting for this forum.

10

A lot of us have never seen that.

11

And you then, almost immediately, replace that 0 with the result of your analogRead(). No problem.

12

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