Motion sensor with microwave radar RCWL-051

// RCWL-051 microwave radar motion sensor example
// Wiring:
// - RCWL-051 VIN  -> Arduino 5V
// - RCWL-051 GND  -> Arduino GND
// - RCWL-051 OUT  -> Arduino D2

const int motionPin = 2;

void setup() {
  pinMode(motionPin, INPUT);
  Serial.begin(9600);
  while (!Serial) {
    ;
  }
  Serial.println("RCWL-051 motion sensor example");
  Serial.println("Move in front of the sensor to see OUTPUT change.");
}

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

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

  delay(250);
}