//SOS: ...---...
// short, short, short, long, long, long, short, short, short
//short = 150ms
//long = 400ms
//off = 100ms

int led1 = 0;
int led2 = 1;
int led3 = 2;
int led4 = 3;
int led5 = 4;
int led6 = 5;
int led7 = 6;
int led8 = 7;
int led9 = 8;

int s = 150;
int l = 400;
int off = 100;

void setup()
{
  pinMode(led1, OUTPUT);
}

void loop()
{
  digitalWrite(led1, HIGH);
  delay(s);
  digitalWrite(led1, LOW);
  delay(off);
  digitalWrite(led2, HIGH);
  delay(s);
  digitalWrite(led2, LOW);
  delay(off);
  digitalWrite(led3, HIGH);
  delay(s);
  digitalWrite(led3, LOW);
  delay(off);

  digitalWrite(led4, HIGH);
  delay(l);
  digitalWrite(led4, LOW);
  delay(off);
  digitalWrite(led5, HIGH);
  delay(l);
  digitalWrite(led5, LOW);
  delay(off);
  digitalWrite(led6, HIGH);
  delay(l);
  digitalWrite(led6, LOW);
  delay(off);

  digitalWrite(led7, HIGH);
  delay(s);
  digitalWrite(led7, LOW);
  delay(off);
  digitalWrite(led8, HIGH);
  delay(s);
  digitalWrite(led8, LOW);
  delay(off);
  digitalWrite(led9, HIGH);
  delay(s);
  digitalWrite(led9, LOW);
  delay(off);
  
  delay(2000); //end
}