// Traffic Light Pins
int greenLight = 1;
int yellowLight = 2;
int redLight = 3;

void setup() {
  pinMode(greenLight, OUTPUT);
  pinMode(yellowLight, OUTPUT);
  pinMode(redLight, OUTPUT);
}

void loop() {
  // Red light ON
  digitalWrite(redLight, HIGH);
  digitalWrite(greenLight, LOW);
  digitalWrite(yellowLight, LOW);
  delay(5000); // 5 seconds

  // Green light ON
  digitalWrite(redLight, LOW);
  digitalWrite(greenLight, HIGH);
  delay(5000); // 5 seconds

  // Yellow light ON
  digitalWrite(greenLight, LOW);
  digitalWrite(yellowLight, HIGH);
  delay(2000); // 2 seconds

  // Yellow OFF before loop repeats
  digitalWrite(yellowLight, LOW);
}