// Pins connected to the LEDs
const int LED_PIN_1 = 2;
const int LED_PIN_2 = 3;
const int LED_PIN_3 = 4;
const int LED_PIN_4 = 5;
const int LED_PIN_5 = 6;

void setup() {
  // Initialize the LED pins as outputs
  pinMode(LED_PIN_1, OUTPUT);
  pinMode(LED_PIN_2, OUTPUT);
  pinMode(LED_PIN_3, OUTPUT);
  pinMode(LED_PIN_4, OUTPUT);
  pinMode(LED_PIN_5, OUTPUT);
}

void loop() {
  // Call each sequence function one by one
  sequence1();
  delay(2000);
  
  sequence2();
  delay(2000);
  
  sequence3();
  delay(2000);
  
  sequence4();
  delay(2000);
  
  sequence5();
  delay(2000);
}

// Sequence 1: Alternating red and green lights
void sequence1() {
  // Turn on LED 1 (red) and LED 2 (green)
  digitalWrite(LED_PIN_1, HIGH);
  digitalWrite(LED_PIN_2, HIGH);
  delay(500);
  // Turn off LED 1 and LED 2
  digitalWrite(LED_PIN_1, LOW);
  digitalWrite(LED_PIN_2, LOW);
  delay(500);
}

// Sequence 2: Blinking blue lights
void sequence2() {
  // Turn on LED 3 (blue)
  digitalWrite(LED_PIN_3, HIGH);
  delay(500);
  // Turn off LED 3
  digitalWrite(LED_PIN_3, LOW);
  delay(500);
}

// Sequence 3: Running lights
void sequence3() {
  // Turn on LED 4 (yellow)
  digitalWrite(LED_PIN_4, HIGH);
  delay(200);
  // Turn off LED 4, turn on LED 5 (purple)
  digitalWrite(LED_PIN_4, LOW);
  digitalWrite(LED_PIN_5, HIGH);
  delay(200);
  // Turn off LED 5, turn on LED 4
  digitalWrite(LED_PIN_5, LOW);
  digitalWrite(LED_PIN_4, HIGH);
  delay(200);
  // Turn off LED 4, turn on LED 5
  digitalWrite(LED_PIN_4, LOW);
  digitalWrite(LED_PIN_5, HIGH);
  delay(200);
  // Turn off LED 5
  digitalWrite(LED_PIN_5, LOW);
}

// Sequence 4: Fading white lights
void sequence4() {
  // Fade in
  for (int brightness = 0; brightness <= 255; brightness += 5) {
    analogWrite(LED_PIN_1, brightness);
    analogWrite(LED_PIN_2, brightness);
    analogWrite(LED_PIN_3, brightness);
    analogWrite(LED_PIN_4, brightness);
    analogWrite(LED_PIN_5, brightness);
    delay(50);
  }
  // Fade out
  for (int brightness = 255; brightness >= 0; brightness -= 5) {
    analogWrite(LED_PIN_1, brightness);
    analogWrite(LED_PIN_2, brightness);
    analogWrite(LED_PIN_3, brightness);
    analogWrite(LED_PIN_4, brightness);
    analogWrite(LED_PIN_5, brightness);
    delay(50);
  }
}

// Sequence 5: Randomly blinking lights
void sequence5() {
  // Turn on a random LED
  int randomLED = random(1, 6);
  switch (randomLED) {
    case 1:
      digitalWrite(LED_PIN_1, HIGH);
      break;
    case 2:
      digitalWrite(LED_PIN_2, HIGH);
      break;
    case 3:
      digitalWrite(LED_PIN_3, HIGH);
      break;
    case 4:
      digitalWrite(LED_PIN_4, HIGH);
      break;
    case 5:
      digitalWrite(LED_PIN_5, HIGH);
      break;
  }
  delay(500);
  // Turn off all LEDs
  digitalWrite(LED_PIN_1, LOW);
  digitalWrite(LED_PIN_2, LOW);
  digitalWrite(LED_PIN_3, LOW);
  digitalWrite(LED_PIN_4, LOW);
  digitalWrite(LED_PIN_5, LOW);
}