int timeOn = 1000; //  1000  = 1 
int pinArrayLed[] = { 2, 3, 4, 5, 6, 7 }; //    
int longArray = 6; // 
void setup() 
{
for (int pinCurrent = 0; pinCurrent < longArray; pinCurrent++) 
{
pinMode(pinArrayLed[pinCurrent], OUTPUT); //   
}
}
void loop() 
{
//     
for (int pinCurrent = 0; pinCurrent < longArray; pinCurrent++) 
{
digitalWrite(pinArrayLed[pinCurrent], HIGH); //  
delay(timeOn);
digitalWrite(pinArrayLed[pinCurrent], LOW); //  
}
//     
for (int pinCurrent = longArray - 1; pinCurrent >= 0; pinCurrent --) 
{
digitalWrite(pinArrayLed[pinCurrent], HIGH); //  
delay(timeOn);
digitalWrite(pinArrayLed[pinCurrent], LOW); //  
}
} 
