Hello Arduino

hello.ino

#define BUTTON 5
#define LED 8

void setup()
{
  Serial.begin(9600);
  pinMode(LED, OUTPUT);
  pinMode(BUTTON, INPUT_PULLUP);
  Serial.println("Hello, Arduino");
}

void loop()
{
  if (digitalRead(BUTTON) == LOW) {
  	digitalWrite(LED, HIGH);
    delay(20);
    digitalWrite(LED, LOW);
  }
}