[SOLVED] [2 digit number] was not declared in this scope?

Projects Programming
1

Hello, I'm new to arduino and I made this 10 pin project:

void setup() {
  // put your setup code here, to run once:
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(3, HIGH);
  delay(100);
digitalWrite(3, LOW);
  digitalWrite(4, HIGH);
  delay(100);  
  digitalWrite(4, LOW);
  digitalWrite(5, HIGH);
  delay(100);
digitalWrite(5, LOW);
  digitalWrite(6, HIGH);
  delay(100);
    digitalWrite(6, LOW);
  digitalWrite(7, HIGH);
  delay(100);
digitalWrite(7, LOW);
  digitalWrite(8, HIGH);
  delay(100);
    digitalWrite(8, LOW);
  digitalWrite(9, HIGH);
  delay(100);
digitalWrite(9, LOW);
  digitalWrite(10, HIGH);
  delay(100);  
  digitalWrite(l0, LOW);
  digitalWrite(11, HIGH);
  delay(100);
digitalWrite(l1, LOW);
  digitalWrite(12, HIGH);
  delay(100);
    digitalWrite(l2, LOW);
  digitalWrite(13, HIGH);
  delay(100);
digitalWrite(l3, LOW);
}

However, when I ran this I got this error:

'13' was not declared in this scope

This is only happening to 2 digit pins. If I remove pin 13 from my code, it gives me the same error but with a different 2 digit pin (like pin 10).

2

digitalWrite(l3, LOW);This is I3 or L3 (not 13), hard to tell which as it depends on the font.

3

There's another one (l1,not 11)

digitalWrite(l1, LOW);
  digitalWrite(12, HIGH);
5

At least on Windows, the default font of the Arduino IDE makes it impossible to distinguish between the number one and a lower case l. It also is very difficult to tell a zero from an upper case o. For this reason, I prefer to change the font to Consolas (which doesn't have these issues):

  • File > Preferences
  • Click the link at the line following File > Preferences > More preferences can be edited directly in the file.
  • Close the Arduino IDE
  • Open preferences.txt in a text editor.
  • Change editor.font to your desired font.
  • Save the file.

Mine looks like this:

editor.font=Consolas,plain,12