#define LED_PIN 4

// the setup function runs once when you press reset or power the board

// connect the resistor to ground and the straight side of the LED
// connedt the bent side of the LED to pin 4

void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_PIN, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_PIN, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(1000);                      // wait for a second
  digitalWrite(LED_PIN, LOW);   // turn the LED off by making the voltage LOW
  delay(500);                      // wait for a second
}