const int pir=2;
const int led=3;

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

}

void loop() {
  // put your main code here, to run repeatedly:
  int pirState=digitalRead(pir);

  if (pirState==HIGH) {
    digitalWrite(led, HIGH);
    Serial.println("Motion detected.");
  }else {
    digitalWrite(led, LOW);
    Serial.println("No motion detected.");
  }
  delay(1000);

}