// Pin assignments
const int redLed = 3;
const int yellowLed = 4;
const int greenLed = 5;
const int buzzer = 6;

void setup() {
  pinMode(redLed, OUTPUT);
  pinMode(yellowLed, OUTPUT);
  pinMode(greenLed, OUTPUT);
  pinMode(buzzer, OUTPUT);
}

void loop() {
  // Red LED and buzzer: 800ms
  digitalWrite(redLed, HIGH);
  digitalWrite(buzzer, HIGH);
  delay(800);
  digitalWrite(redLed, LOW);
  digitalWrite(buzzer, LOW);
  delay(100);

  // Yellow LED and buzzer: 500ms
  digitalWrite(yellowLed, HIGH);
  digitalWrite(buzzer, HIGH);
  delay(500);
  digitalWrite(yellowLed, LOW);
  digitalWrite(buzzer, LOW);
  delay(100);

  // Green LED and buzzer: 300ms
  digitalWrite(greenLed, HIGH);
  digitalWrite(buzzer, HIGH);
  delay(300);
  digitalWrite(greenLed, LOW);
  digitalWrite(buzzer, LOW);
  delay(100);
}