Code for creating a blinking LED circuit with Arduino

BlinkingSingleLED.ino

#define LED_PIN 13

void setup() {
  pinMode(LED_PIN,OUTPUT); // use pin 13 in OUTPUT MODE 
}

void loop() {
  digitalWrite(LED_PIN, HIGH); // set pin to High Voltage : LED ON
  delay(1000); // wait for 1 sec
  digitalWrite(LED_PIN,LOW); // set pin to Low Voltage : LED OFF
  delay(1000); // wait for 1 sec
}