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#navi(arduino);
**LED [#ac3a3b68]
#ref(led2220ohm5.png);
#ref(led2220ohm5.png,,50%);

 /*
   For Loop Iteration
  
  Demonstrates the use of a for() loop. 
  Lights multiple LEDs in sequence, then in reverse.
  
  The circuit:
  * LEDs from pins 2 through 7 to ground
  
  created 2006
  by David A. Mellis
  modified 30 Aug 2011
  by Tom Igoe 
 
 This example code is in the public domain.
  
  http://www.arduino.cc/en/Tutorial/ForLoop
  */
 
 int timer = 15;           // The higher the number, the slower the timing.
 
 void setup() {
   // use a for loop to initialize each pin as an output:
   for (int thisPin = 2; thisPin < 7; thisPin++)  {
     pinMode(thisPin, OUTPUT);      
   }
 }
 
 void loop() {
   // loop from the lowest pin to the highest:
   for (int thisPin = 2; thisPin < 7; thisPin++) { 
     // turn the pin on:
     digitalWrite(thisPin, HIGH);   
     delay(timer);                  
     // turn the pin off:
     digitalWrite(thisPin, LOW);    
   }
 
   // loop from the highest pin to the lowest:
   for (int thisPin = 6; thisPin >= 2; thisPin--) { 
     // turn the pin on:
     digitalWrite(thisPin, HIGH);
     delay(timer);
     // turn the pin off:
     digitalWrite(thisPin, LOW);
   }
 }