const int L1=23, L2=22, L3=21, L4=19, L5=18, L6=5, L7=17, L8=16;  //initializing LED pins

void setup()

{

pinMode(L1, OUTPUT);       // Set all Port P2 pins as output

pinMode(L2, OUTPUT);

pinMode(L3, OUTPUT);

pinMode(L4, OUTPUT);

pinMode(L5, OUTPUT);

pinMode(L6, OUTPUT);

pinMode(L7, OUTPUT);

pinMode(L8, OUTPUT);

}

void loop()

{

digitalWrite(L1, HIGH);

digitalWrite(L2, HIGH);

digitalWrite(L3, HIGH);

digitalWrite(L4, HIGH);

digitalWrite(L5, HIGH);

digitalWrite(L6, HIGH);

digitalWrite(L7, HIGH);

digitalWrite(L8, HIGH);

delay(2000);

digitalWrite(L1, LOW);

digitalWrite(L2, LOW);

digitalWrite(L3, LOW);

digitalWrite(L4, LOW);

digitalWrite(L5, LOW);

digitalWrite(L6, LOW);

digitalWrite(L7, LOW);

digitalWrite(L8, LOW);

delay(2000);

}