void setup() {
  pinMode(15,INPUT);// put your setup code here, to run once:
  Serial1.begin(115200);
  Serial1.println("Hello, Raspberry Pi Pico!");
}

void loop() {
  int pir=digitalRead(15);
  if(pir == HIGH)
  {
    Serial1.println("movement detected");
    delay(500);
  }
  else
  {
    Serial1.println("no");
    delay(500);
  }
}