const int ledPin = 8; 

void setup() {
  Serial.begin(115200);
  delay(500); // give USB serial time to connect
  pinMode(ledPin, OUTPUT);
  Serial.println("Serial connected!");
}

void loop() {
  digitalWrite(ledPin, HIGH); 
  Serial.println("LED ON");
  delay(1000);
  digitalWrite(ledPin, LOW);
  Serial.println("LED OFF");
  delay(1000);
}