#define Buzzer_pin 4 
void setup() {
pinMode (1, OUTPUT);
pinMode (3, OUTPUT) ;
pinMode (Buzzer_pin,  OUTPUT);
}

void loop() {
 digitalWrite (1, HIGH ) ;
 digitalWrite (3,  LOW ) ;
 tone (Buzzer_pin ,HIGH );
 delay (8000) ;
 digitalWrite (3,  HIGH) ;
 digitalWrite (1, LOW) ;
 noTone (Buzzer_pin) ; 
 delay (4000);
}