Calling functions

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

Hi there,

I have a question concerning the calling of function during a sketch.

int outputPin = 13;

void setup()
{
  pinMode(outputPin, OUTPUT);
}

void loop()
{
  digitalWrite(outputPin, HIGH);
  delay(3000);
  void aus();
}

void aus()
{
  digitalWrite(outputPin, LOW);
}

What I am trying to do here is to call the function "void aus()" so that the led turns of. Which syntax do I have to use to get the function "void aus()" running after three seconds? This is just a simplification of the problem I have, but any help on this is greatly appreciated!

1 Like
2

'void' is the return type, not part of the function's name. Omit the return type when calling the function.

 aus();
1 Like
3

Thank you!

4

You may find that you must declare the function:

void aus()
{
  digitalWrite(outputPin, LOW);
}

before you call it:

  aus ();

The compiler may give you warnings and/or errors if you call before you've declared. Best to put the function's declaration after the line that sets the output pin, but before "void setup ()".

5

Anacrocomputer, the arduino build environment automatically creates prototypes for functions in the main tab of a sketch so there is no need to put a function declaration before it is called.

But it is a good habit to get in for people that want to move on to a more traditional C/C++environment.

6

the arduino build environment automatically creates prototypes

OK, I didn't know that -- thanks!