int timer = 200;                   // Timer (miliseconds)
int pins[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 }; // Pin massive (array) which will use
int num_pins = 9;                  // Pin count

void setup()
{
  int i;
  for (i = 0; i < num_pins; i++)  
    pinMode(pins[i], OUTPUT);      // Set pin's as OUTPUT
}

void loop()
{
  int i;  
//Turn off all led's
    for (i = 0; i < num_pins; i++)  
  {
    digitalWrite(pins[i], LOW); 
  }
    
  //Turn on and then off all LED's from LEFT to RIGHT
  for (i = 0; i < num_pins; i++) 
  {
    digitalWrite(pins[i], HIGH);   
    delay(timer);                  
    digitalWrite(pins[i], LOW);   
  }
  
  //Turn on and hen off LED's from RIGHT TO LEFT
  for (i = num_pins - 1; i >= 0; i--) 
  {
    digitalWrite(pins[i], HIGH);   

delay(timer);                  
    digitalWrite(pins[i], LOW);   
  }
    
  //Turn on LED's from LEFT to RIGHT
  for (i = 0; i < num_pins; i++) 
  {
    digitalWrite(pins[i], HIGH);   
    delay(timer);                  
  }
   
  //Turn off LED's from LEFT to RIGHT
  for (i = 0; i < num_pins; i++) 
  {
    digitalWrite(pins[i], LOW);   
    delay(timer);                  
  }
  
  //Turn on LED's from RIGHT to LEFT
  for (i = num_pins - 1; i >= 0; i--) 
  {
    digitalWrite(pins[i], HIGH);   
    delay(timer);                  
  }

  //Turn off LED's from LEFT to RIGHT
  for (i = num_pins - 1; i >= 0; i--) 
  {
    digitalWrite(pins[i], LOW);   
    delay(timer);                  
  }  
    
  //Turn on and off LED's from BOTH SIDES at the same time
  int temp = 0;


for (i = num_pins - 1; i >= 4; i--) 
  {
    digitalWrite(pins[i], HIGH);   
    digitalWrite(pins[temp], HIGH);
    delay(timer);           
    digitalWrite(pins[i], LOW);    
    digitalWrite(pins[temp], LOW);
    temp++;
  }    
    
  //Turn on and off all LED's at one moment few times
  int count = 0;
  while (count < 5)
  {
    for (i = 0; i < num_pins; i++) 
   {
      digitalWrite(pins[i], HIGH);
   }
    
    delay(500);
    
   for (i = 0; i < num_pins; i++) 
   {
      digitalWrite(pins[i], LOW);
   }
    
    delay(500);
    
  count++;
  }
}