void setup() {
  pinMode(15, INPUT);
  Serial1.begin(115200);
  Serial1.println("Hello, Raspberry Pi Pico!");
}

void loop() {
  int pir=digitalRead(15);

  if(pir == HIGH)
  {
    Serial1.println("MOTION DETECTED");
    delay(500);
  }

  else 
  {
    Serial1.println("NO MOTION DETECTED");
    delay(500);
  }

}