const int buzzer= 11;

void setup() {
  pinMode (buzzer,OUTPUT);
  pinMode (10,OUTPUT);
  pinMode (9,OUTPUT);
}

void loop() {
  for(int k=0;k<=7;k++){
    tone(buzzer,1000);
    digitalWrite(10,HIGH);
    digitalWrite(9,LOW);
    delay(300);
    tone(buzzer,500);
    digitalWrite(10,LOW);
    digitalWrite(9,HIGH);
    delay(300);
  }
  for(int x=0;x<=5;x++){
    for(int i=500;i>=300;i--){
      tone(buzzer,i);
      int m = map(i,300,500,0,255);
      int k = map(i,500,300,0,255);
      analogWrite(10,m);
      analogWrite(9,k);
      delay(10);
    }
    for(int j=300;j<=500;j++){
      tone(buzzer,j);
      int n = map(j,300,500,0,255);
      int c = map(j,500,300,0,255);
      analogWrite(10,n);
      analogWrite(9,c);
      delay(10);
    }
  }
}