// ---- Pin map using D2–D13 on the Nucleo board ----
int red_1=2,  orange_1=3,  green_1=4;
int red_2=5,  orange_2=6,  green_2=7;
int red_3=8,  orange_3=9,  green_3=10;
int red_4=11, orange_4=12, green_4=13;

void set_all_red() {
  digitalWrite(red_1, HIGH); digitalWrite(orange_1, LOW); digitalWrite(green_1, LOW);
  digitalWrite(red_2, HIGH); digitalWrite(orange_2, LOW); digitalWrite(green_2, LOW);
  digitalWrite(red_3, HIGH); digitalWrite(orange_3, LOW); digitalWrite(green_3, LOW);
  digitalWrite(red_4, HIGH); digitalWrite(orange_4, LOW); digitalWrite(green_4, LOW);
}

void setup() {
  for (int i = 2; i <= 13; i++) {
    pinMode(i, OUTPUT);
  }

  set_all_red();   // Initial all red
  delay(3000);
}

void loop()
{
  // Direction 1
  set_all_red();
  digitalWrite(red_1, LOW);
  digitalWrite(orange_1, HIGH);
  delay(2000);

  set_all_red();
  digitalWrite(red_1, LOW);
  digitalWrite(green_1, HIGH);
  delay(5000);

  // Direction 2
  set_all_red();
  digitalWrite(red_2, LOW);
  digitalWrite(orange_2, HIGH);
  delay(2000);

  set_all_red();
  digitalWrite(red_2, LOW);
  digitalWrite(green_2, HIGH);
  delay(5000);

  // Direction 3
  set_all_red();
  digitalWrite(red_3, LOW);
  digitalWrite(orange_3, HIGH);
  delay(2000);

  set_all_red();
  digitalWrite(red_3, LOW);
  digitalWrite(green_3, HIGH);
  delay(5000);

  // Direction 4
  set_all_red();
  digitalWrite(red_4, LOW);
  digitalWrite(orange_4, HIGH);
  delay(2000);

  set_all_red();
  digitalWrite(red_4, LOW);
  digitalWrite(green_4, HIGH);
  delay(5000);
}