// Semafaro 1
int led_red_1 = 13;
int led_yellow_1 = 12;
int led_green_1 = 11;
// Semafaro 2
int led_red_2 = 10;
int led_yellow_2 = 9;
int led_green_2 = 8;
// Semafaro 3
int led_red_3 = 7;
int led_yellow_3 = 6;
int led_green_3 = 5;
// Semafaro 4
int led_red_4 = 4;
int led_yellow_4 = 3;
int led_green_4 = 2;

void setup() {
    pinMode(led_red_1, OUTPUT);
    pinMode(led_yellow_1, OUTPUT);
    pinMode(led_green_1, OUTPUT);

    pinMode(led_red_2, OUTPUT);
    pinMode(led_yellow_2, OUTPUT);
    pinMode(led_green_2, OUTPUT);

    pinMode(led_red_3, OUTPUT);
    pinMode(led_yellow_3, OUTPUT);
    pinMode(led_green_3, OUTPUT);

    pinMode(led_red_4, OUTPUT);
    pinMode(led_yellow_4, OUTPUT);
    pinMode(led_green_4, OUTPUT);
}

void loop() {
    // ETAPA 1 Activo los 4 Semafaros en Rojo 
    digitalWrite(led_red_1, HIGH);
    digitalWrite(led_red_2, HIGH);
    digitalWrite(led_red_3, HIGH);
    digitalWrite(led_red_4, HIGH);
    delay(3000);
    // ETAPA 2
    digitalWrite(led_red_1, HIGH);
    digitalWrite(led_yellow_1, HIGH);
    digitalWrite(led_red_3, HIGH);
    digitalWrite(led_yellow_3, HIGH);
    delay(2000);
    // ETAPA 3
    digitalWrite(led_red_1, LOW);
    digitalWrite(led_yellow_1, HIGH);
    digitalWrite(led_green_1, HIGH);
    digitalWrite(led_red_3, LOW);
    digitalWrite(led_yellow_3, HIGH);
    digitalWrite(led_green_3, HIGH);
    delay(2000);    
    // ETAPA 4
    digitalWrite(led_yellow_1, LOW);
    digitalWrite(led_green_1, HIGH);
    digitalWrite(led_yellow_3, LOW);
    digitalWrite(led_green_3, HIGH);
    delay(3000);
    // ETAPA 5
    digitalWrite(led_green_1, HIGH);
    digitalWrite(led_yellow_1, HIGH);
    digitalWrite(led_green_3, HIGH);
    digitalWrite(led_yellow_3, HIGH);
    delay(2000);
     // ETAPA 6
    digitalWrite(led_red_1, HIGH);
    digitalWrite(led_yellow_1, HIGH);
    digitalWrite(led_green_1, LOW);
    digitalWrite(led_red_3, HIGH);
    digitalWrite(led_yellow_3, HIGH);
    digitalWrite(led_green_3, LOW);
    delay(2000);
    // ETAPA 7
    digitalWrite(led_red_1, HIGH);    
    digitalWrite(led_red_2, HIGH);
    digitalWrite(led_yellow_1, LOW); 
    digitalWrite(led_red_3, HIGH);    
    digitalWrite(led_red_4, HIGH);
    digitalWrite(led_yellow_3, LOW); 
    delay(3000);
    // ETAPA 28
    digitalWrite(led_red_1, HIGH);
    digitalWrite(led_yellow_2, HIGH);
    digitalWrite(led_red_3, HIGH);
    digitalWrite(led_yellow_4, HIGH);
    delay(2000);
    // ETAPA 9
    digitalWrite(led_red_2, LOW);
    digitalWrite(led_yellow_2, HIGH);
    digitalWrite(led_green_2, HIGH);
    digitalWrite(led_red_4, LOW);
    digitalWrite(led_yellow_4, HIGH);
    digitalWrite(led_green_4, HIGH);
    delay(2000);    
    // ETAPA 10
    digitalWrite(led_yellow_2, LOW);
    digitalWrite(led_green_2, HIGH);
    digitalWrite(led_yellow_4, LOW);
    digitalWrite(led_green_4, HIGH);
    delay(3000);
    // ETAPA 11
    digitalWrite(led_green_2, HIGH);
    digitalWrite(led_yellow_2, HIGH);
    digitalWrite(led_green_4, HIGH);
    digitalWrite(led_yellow_4, HIGH);
    delay(2000);
     // ETAPA 12
    digitalWrite(led_red_2, HIGH);
    digitalWrite(led_yellow_2, HIGH);
    digitalWrite(led_green_2, LOW);
    digitalWrite(led_red_4, HIGH);
    digitalWrite(led_yellow_4, HIGH);
    digitalWrite(led_green_4, LOW);
    delay(2000);
    // ETAPA 13
    digitalWrite(led_yellow_2, LOW);
    digitalWrite(led_yellow_4, LOW);
    delay(2000);
}