// Define the pins for LEDs
const int ledPin1 = 2;  // Pin for LED 1
const int ledPin2 = 3;  // Pin for LED 2
const int ledPin3 = 4;  // Pin for LED 3
// Add more pins if you have more LEDs

void setup() {
  // Initialize each LED pin as an output
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  // Add more pinMode() statements if you have more LEDs
}

void loop() {
  // Turn on each LED one by one and then turn off
  digitalWrite(ledPin1, HIGH);
  delay(1000);  // Wait for 1 second
  digitalWrite(ledPin1, LOW);

  digitalWrite(ledPin2, HIGH);
  delay(1000);  // Wait for 1 second
  digitalWrite(ledPin2, LOW);

  digitalWrite(ledPin3, HIGH);
  delay(1000);  // Wait for 1 second
  digitalWrite(ledPin3, LOW);
  // Add more blocks like this for additional LEDs
}