//The second project -- S.O.S signal
int ledPin = 10;
void setup() {
 pinMode(ledPin, OUTPUT);
}
void loop() {
 //3 quick blinks to represent “S” again
 for(int x=0;x<3;x++){
 digitalWrite(ledPin,HIGH); 
 delay(150); 
 digitalWrite(ledPin,LOW);
 delay(100);
 }
 
 //100 milliseconds delay between of each letter 
 delay(100);
 //3 quick blinks to represent “O”
 for(int x=0;x<3;x++){
 digitalWrite(ledPin,HIGH); 
 delay(400);
 digitalWrite(ledPin,LOW); 
 delay(100);
 }
 //100 milliseconds delay between of each letter
 delay(100);
// 3 quick blinks to represent “S” again
 for(int x=0;x<3;x++){
 digitalWrite(ledPin,HIGH); 
 delay(150); 
 digitalWrite(ledPin,LOW); 
 delay(100); 
 }
 // wait 5 seconds to repeat the next S.O.S signal
 delay(5000);
 }