// Define LED pins
#define LED1 6
#define LED2 7
#define LED3 8

void setup() {
  // Set all LED pins as OUTPUT
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  
  Serial.begin(115200);
  Serial.println("Multiple LED Racing Pattern Started!");
}

void loop() {
  // Racing pattern: Light up LEDs sequentially
  // LED1 turns ON
  digitalWrite(LED1, HIGH);
  delay(300);
  digitalWrite(LED1, LOW);
  
  // LED2 turns ON
  digitalWrite(LED2, HIGH);
  delay(300);
  digitalWrite(LED2, LOW);
  
  // LED3 turns ON
  digitalWrite(LED3, HIGH);
  delay(300);
  digitalWrite(LED3, LOW);
  
  // Then repeat in reverse order
  // LED2 turns ON
  digitalWrite(LED2, HIGH);
  delay(300);
  digitalWrite(LED2, LOW);
  
  // LED1 turns ON
  digitalWrite(LED1, HIGH);
  delay(300);
  digitalWrite(LED1, LOW);
}