void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600); //will initialise serial communication
  Serial.println("Hello Arduino");
  pinMode(13,OUTPUT); //makes pin 13 an output
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(13, HIGH); //turns pin 13 on
  delay(1000);
  digitalWrite(13, LOW); //turns pin 13 off
  delay(1000);
}