#define R 13
#define G 10
#define Y 9
#define B 2

void setup() {
  pinMode(R, OUTPUT);
  pinMode(Y, OUTPUT);
  pinMode(G, OUTPUT);
  pinMode(B, OUTPUT);
}

void loop() {
  // Turn on the red LED and the buzzer, turn off the yellow and green LEDs
  digitalWrite(R, HIGH);
  digitalWrite(Y, LOW);
  digitalWrite(G, LOW);
  digitalWrite(B, HIGH);
  delay(5000);

  // Keep the red LED on, turn on the yellow LED, turn off the green LED, keep the buzzer on
  digitalWrite(R, HIGH);
  digitalWrite(Y, HIGH);
  digitalWrite(G, LOW);
  digitalWrite(B, LOW);
  delay(2000);

  // Turn off the red and yellow LEDs, turn on the green LED, turn off the buzzer
  digitalWrite(R, LOW);
  digitalWrite(Y, LOW);
  digitalWrite(G, HIGH);
  digitalWrite(B, LOW);
  delay(2000);

  // Turn off the red LED, turn on the yellow and green LEDs, turn off the buzzer
  digitalWrite(R, LOW);
  digitalWrite(Y, HIGH);
  digitalWrite(G, HIGH);
  digitalWrite(B, LOW);
  delay(1000);
}