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===== Oak: Advanced LEDs =====


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=== Code: for() loop ===

You can also define the delays using variables and loops to make things more interesting:

<code>
// now we've added two variables to hold our
// on and off time delays
// the "int" variable is able to hold integer values
int on_time;
int off_time;

void setup() 
{                

  pinMode(1, OUTPUT); //LED on Oak

}

void loop()
{

  // the for() loop will initialize a new temporary variable, i
  // it runs until i >= 500, adding 50 each time
  for(int i = 0; i < 500; i = i+50)
  {

    // the on time will equal i (0, 50, 100, ...)
    on_time = i;
    
    // the off time will equal 500 - i (500, 450, 400, ...)
    off_time = 500 - i;

    digitalWrite(1, HIGH);
    delay(on_time);
  
    digitalWrite(1, LOW);
    delay(off_time);
  
  }
  
}
</code>

Here is what happens each time the loop runs:

^time through loop ^i ^on_time ^off_time|
|1|0|0|500|
|2|50|50|450|
|3|100|100|300|
|.|.|.|.|
|.|.|.|.|
|10|450|450|50|

When the ''for()'' loop above runs, ''i'' is equal to 0. It calculatesIf you upload this code, you will see this (click for enlarged view in new tab):

[[http://digistump.com/wiki/_media/oak/tutorials/loop-changing-blink.gif|{{oak:tutorials:loop-changing-blink.gif?300}}]]

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