const int LED_PIN = 5;

void setup() {
  pinMode(LED_PIN, OUTPUT);
  Serial1.begin(115200);
  Serial1.println("Hello? Py&Pico");
}

void loop() {
  digitalWrite(LED_PIN, HIGH);
  Serial1.println("on");
  delay(1000);

  digitalWrite(LED_PIN, LOW);
  Serial1.println("off");
  delay(1000);
}