Problem with analogRead()

Forum 2005-2010 (read only) Software Syntax & Programs
1

Hi!

I'm trying to read an analog value from my photocell, but simply I can't compile my program, because I can't set the input pin to A0 (or A-whatever). My loop():

void loop()
{
  int sensor = analogRead(A0);
  Serial.println(sensor);
}

But I get the following error: "'A0' was not declared in this scope.

Could somebody help? Thanks.
And sorry for my n00b question, I'm just a beginner.

2

Upgrade to Arduino IDE 0022.

3

Thanks, it really runs. But unfortunately, I have another problem with the new version (022) of IDE, very often I can't get my program into the arduino (because of "programmer is not responding"), while in the old version (018) it's okay.

4

you must wait a little bit

5

Then use, int sensor = analogRead(0); instead. A0 is just an alias of 0, A1 =1, etc.

Lefty

6

Okay, thanks for replies :slight_smile:

7

A0 is just an alias of 0,

Close, but A0 has the value 14 (or 54)

8

Close, but A0 has the value 14 (or 54)

OK, but then analogRead(0) must be an alias of analogRead(14) ?

Lefty

9

OK, but then analogRead(0) must be an alias of analogRead(14) ?

Exactly.