void setup() {
  // put your setup code here, to run once:
  // set all the pins to outputs;
pinMode (5, OUTPUT);
pinMode (6, OUTPUT);
pinMode (7, OUTPUT);
pinMode (8, OUTPUT);
pinMode (9, OUTPUT);
pinMode (10, OUTPUT);
pinMode (11, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  // turn all the pins on
  digitalWrite (5, HIGH);
  digitalWrite (6, HIGH);
    digitalWrite (7, HIGH);
  digitalWrite (8, HIGH);
    digitalWrite (9, HIGH);
  digitalWrite (10, HIGH);
    digitalWrite (11, HIGH);
// wait 300 ms
    delay (300);
// turn all the pins off
  digitalWrite (5, LOW);
  digitalWrite (6, LOW);
    digitalWrite (7, LOW);
  digitalWrite (8, LOW);
    digitalWrite (9, LOW);
  digitalWrite (10, LOW);
    digitalWrite (11, LOW);
// wait 300ms
    delay(300);
// go back to the beginning
}