This is the code for the Buzzer and Led SOS

const int ledPin = 5;           
const int pinBuzzer = 4;        

void setup() {
pinMode(pinBuzzer,OUTPUT);
pinMode(ledPin, OUTPUT);
}

void SOS(int n) {
  tone(pinBuzzer, 440);          
  digitalWrite(ledPin, HIGH);   
   delay(n);                     
  noTone(pinBuzzer);             
  digitalWrite(ledPin, LOW);     
   delay(500);                  
  tone(pinBuzzer, 440);
  digitalWrite(ledPin, HIGH); 
   delay(n);
  noTone(pinBuzzer);
  digitalWrite(ledPin, LOW); 
   delay(500); 
  tone(pinBuzzer, 440);
  digitalWrite(ledPin, HIGH); 
   delay(n);
  noTone(pinBuzzer);
  digitalWrite(ledPin, LOW); 
   delay(500); 
}

void silence (){
  noTone(pinBuzzer);
  digitalWrite(ledPin, LOW); 
   delay(3000);
}
void loop() {
  SOS(500);
  SOS(1500);
  SOS(500);
  silence();
}