void setup() {
  // put your setup code here, to run once:
  pinMode(9,OUTPUT);
pinMode(3, INPUT);
} 

void loop() {
  // put your main code here, to run repeatedly:
  
  //Legge il sensore ad infrarossi ed attiva un buzzer se rileva un movimento.
  if(digitalRead(3)==HIGH{
  }
  digitalWrite(9, LOW);
  delay(500);
  digitalWrite(9, HIGH);
  delay(100);
  }else{
    digitalWrite(9, LOW);
  }
}