const int red = 13;
const int blue = 13;

void setup() {
  Serial.begin(9600);
  Serial.println("Board ON!");
  pinMode(red, OUTPUT);
  pinMode(blue, OUTPUT);
}

void loop() {
  Serial.println("LED ON!");
  digitalWrite(red, HIGH);
  delay(2000);
  digitalWrite(blue, LOW);
  delay(2000);
  digitalWrite(red, LOW);
  delay(2000);
  digitalWrite(blue, HIGH);
  delay(2000);
}