// Define the pins for the LEDs
#define BLINK_LED_PIN 23
#define LED_PIN_1 22
#define LED_PIN_2 21

void setup() {
  // Initialize the pins as outputs
  pinMode(BLINK_LED_PIN, OUTPUT);
  pinMode(LED_PIN_1, OUTPUT);
  pinMode(LED_PIN_2, OUTPUT);
  
  // Ensure other LEDs are off
  digitalWrite(LED_PIN_1, LOW);
  digitalWrite(LED_PIN_2, LOW);
}

void loop() {
  // Blink the LED
  digitalWrite(BLINK_LED_PIN, HIGH);  // Turn the LED on
  delay(500);                         // Wait for 500 milliseconds
  digitalWrite(BLINK_LED_PIN, LOW);   // Turn the LED off
  delay(500);                         // Wait for 500 milliseconds
}