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");
  delay(500);
}
}