// Define the GPIO pins for the LEDs
#define LED_PIN_1 2  // GPIO 2 for LED 1
#define LED_PIN_2 20  // GPIO 3 for LED 2

// Define the delay time in milliseconds
#define BLINK_DELAY 500

void setup() {
  // Initialize the LED pins as outputs
  pinMode(LED_PIN_1, OUTPUT);
  pinMode(LED_PIN_2, OUTPUT);

  // Initialize the LEDs to be off
  digitalWrite(LED_PIN_1, LOW);
  digitalWrite(LED_PIN_2, LOW);
}

void loop() {
  // Turn on LED 1 and turn off LED 2
  digitalWrite(LED_PIN_1, HIGH);
  digitalWrite(LED_PIN_2, LOW);
  delay(BLINK_DELAY);

  // Turn off LED 1 and turn on LED 2
  digitalWrite(LED_PIN_1, LOW);
  digitalWrite(LED_PIN_2, HIGH);
  delay(BLINK_DELAY);
}