void setup() {
  pinMode( 7, OUTPUT);
  pinMode( 8, OUTPUT);
  pinMode( 9, OUTPUT);


}

void loop() {
  digitalWrite( 7, HIGH);  
  delay(300);                       
  digitalWrite( 7, LOW);   
  delay(300);   

  digitalWrite( 8, HIGH);  
  delay(300);                       
  digitalWrite( 8, LOW);   
  delay(300);  

  digitalWrite( 9, HIGH);  
  delay(300);                       
  digitalWrite( 9, LOW);   
  delay(300);                     
}