// Define LED Pins
#define LED1 18
#define LED2 19
#define LED3 21

void setup() {
  // Set LED pins as OUTPUT
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
}

void loop() {
  // Chase Pattern
  digitalWrite(LED1, HIGH);
  delay(200);
  digitalWrite(LED1, LOW);
  
  digitalWrite(LED2, HIGH);
  delay(200);
  digitalWrite(LED2, LOW);
  
  digitalWrite(LED3, HIGH);
  delay(200);
  digitalWrite(LED3, LOW);

  // Breathe Pattern
  for (int i = 0; i <= 255; i++) {
    analogWrite(LED1, i);
    analogWrite(LED2, i);
    analogWrite(LED3, i);
    delay(8);
  }
  for (int i = 255; i >= 0; i--) {
    analogWrite(LED1, i);
    analogWrite(LED2, i);
    analogWrite(LED3, i);
    delay(8);
  }

  // Odd-Even Pattern
  digitalWrite(LED1, HIGH);
  digitalWrite(LED3, HIGH);
  delay(500);
  digitalWrite(LED1, LOW);
  digitalWrite(LED3, LOW);
  
  digitalWrite(LED2, HIGH);
  delay(500);
  digitalWrite(LED2, LOW);
}