int buzzer=11;



void setup()



{



 pinMode(buzzer,OUTPUT);



}



void loop()



{



 unsigned char i,j;



 while(1)



 {



for(i=0;i<80;i++)//Output sound of one frequency 



 {



  digitalWrite(buzzer,HIGH);//make a sound 



    delay(1);//delay 1ms



  digitalWrite(buzzer,LOW);//silient 



 delay(1);//delay 1ms 



  }



   for(i=0;i<500;i++)//output sound of another frequency 



    {



      digitalWrite(buzzer,HIGH);//make a sound 



      delay(2);//delay 2ms



      digitalWrite(buzzer,LOW);//silient 



      delay(2);//delay 2ms



    }



  }



}