void setup() {
  Serial1.begin(115200);
  Serial1.println("Pi Pico Serial Monitor example!");
  Serial1.println("-------------------------------");
}

byte value = 0;
void loop() {
  Serial1.print("Counter: ");
  Serial1.print(value);
  Serial1.print(", hex: ");
  Serial1.println(value, HEX);
  value += 1;
  delay(500);
}