int PIR = 3;

void setup() {
  // put your setup code here, to run once:
 pinMode(3, INPUT);
 Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(3) == HIGH) {
    Serial.print(" COGLIONE RILEVATO ");
    delay(1000);
  }
  else {
    Serial.print(" niente per ora ");
    delay(1000);
  }
}