HC-SR501 PIR Motion Sensor

// HC-SR501 PIR Motion Sensor
// Reads the PIR motion output and prints when motion is detected.

const int pirPin = 2;

void setup() {
  pinMode(pirPin, INPUT);
  Serial.begin(9600);
  while (!Serial) {
    ;
  }
  Serial.println("HC-SR501 PIR motion sensor ready");
}

void loop() {
  int motionState = digitalRead(pirPin);

  if (motionState == HIGH) {
    Serial.println("Motion detected!");
  } else {
    Serial.println("No motion");
  }

  delay(500);
}