const char s[] = ".... . .-.. .-.. --- --..-- / .-- --- .-. .-.. -.. -.-.--!";
void dot(int pin){
  digitalWrite(pin, 1);
  delay(300);
  digitalWrite(pin, 0);
  delay(300);
}
void dash(int pin){
  digitalWrite(pin, 1);
  delay(900);
  digitalWrite(pin, 0);
  delay(300);
}
void setup() {
  // put your setup code here, to run once:
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int len_str = strlen(s);
  int i = 0;
  while (i<len_str){
    switch(s[i]){
      case '.':
        dot(13);
        break;
      case '-':
        dash(13);
        break;
      case ' ':
        delay(600);
        break;
      case '/':
        delay(1800);
        break;
      default:dash(12);
    }
    i++;
  }
}