const int led1 = 12; // LED connected to digital pin 2
const int led2 = 11; // LED connected to digital pin 3
const int led3 = 10; // LED connected to digital pin 4
const int led4 = 9; // LED connected to digital pin 5
const int led5 = 8; // LED connected to digital pin 6

void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
}

void loop() {
  // Pattern for LED1: Blink every 500ms
  digitalWrite(led1, HIGH);
  delay(500);
  digitalWrite(led1, LOW);
  delay(500);

  // Pattern for LED2: Blink twice fast, then pause
  digitalWrite(led2, HIGH);
  delay(100);
  digitalWrite(led2, LOW);
  delay(100);
  digitalWrite(led2, HIGH);
  delay(100);
  digitalWrite(led2, LOW);
  delay(700);

  // Pattern for LED3: Blink every second
  digitalWrite(led3, HIGH);
  delay(1000);
  digitalWrite(led3, LOW);
  delay(1000);

  // Pattern for LED4: Blink in Morse code for "S" (three short blinks)
  for (int i = 0; i < 3; i++) {
    digitalWrite(led4, HIGH);
    delay(200);
    digitalWrite(led4, LOW);
    delay(200);
  }
  delay(1000);

  // Pattern for LED5: Fade in and out
  for (int brightness = 0; brightness <= 255; brightness++) {
    analogWrite(led5, brightness);
    delay(10);
  }
  for (int brightness = 255; brightness >= 0; brightness--) {
    analogWrite(led5, brightness);
    delay(10);
  }
  delay(1000);
}