#include <Arduino.h>

const int ONBOARD_LED_PIN = 2;

void setup()
{
  Serial.begin(115200);
  pinMode(ONBOARD_LED_PIN, OUTPUT);
  Serial.println("setup complete");
}

void loop()
{
  digitalWrite(ONBOARD_LED_PIN, HIGH);
  delay(1000);
  digitalWrite(ONBOARD_LED_PIN, LOW);
  delay(1000);
}