constant for delay

Forum 2005-2010 (read only) General Frequently-Asked Questions
#1

Hi,

I'm trying to make some led light walk like on Kit.

I'm trying to use a constant for the delay so when I have to change the interval I don't have to change a large number of delay values.

This is the code so far but compiling this already gives trouble.

void setup() 
{ 
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);  
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  const int val = 30;
} 

void loop()
{
  digitalWrite(2, HIGH);
  delay (val);
}

After compiling I'm told "'val' was not declared in this scope". I think I just did???

Anybody know how to do it?

Thanks,

#2

First, please use the button when posting code :)

Declare the constant outside of any function. This way it has 'global scope' and can be referred to in all functions.

#3

They way you defined 'val', it is only in scope inside of the function setup(). Do what Alpha told you to change that.

#4

Thanks,

Now it works!

#5