#define PIN_SENSOR 2
#define PIN_LED_VERDE_CAR 3
#define PIN_LED_AMARELO_CAR 4
#define PIN_LED_VERMELHO_CAR 5 
#define PIN_LED_VERDE_PED 6
#define PIN_LED_VERMELHO_PED 7

int modo = 0;

void setup() {
  pinMode(PIN_SENSOR, INPUT);
  
  for (int i = 3; i <= 7; i++) { 
    pinMode(i, OUTPUT);
  }

  attachInterrupt(digitalPinToInterrupt(PIN_SENSOR), SensorAcionado, FALLING); 
}

void loop() {
  switch (modo) {
    case 0:
      modocarros();
      break;
    case 1:
      travessia();
      break;
  }
}

void SensorAcionado() {
  modo = 1;
}

void travessia() {
  delay(1000);
  digitalWrite(PIN_LED_VERDE_CAR, LOW);
  digitalWrite(PIN_LED_AMARELO_CAR, HIGH);
  delay(3000);

  digitalWrite(PIN_LED_VERDE_PED, HIGH);
  digitalWrite(PIN_LED_VERMELHO_PED, LOW);
  digitalWrite(PIN_LED_AMARELO_CAR, LOW);
  digitalWrite(PIN_LED_VERMELHO_CAR, HIGH);
  delay(5000);

  digitalWrite(PIN_LED_VERDE_PED, LOW);
  for (int i = 0; i < 5; i++) {
    digitalWrite(PIN_LED_VERDE_PED, HIGH); 
    delay(300);
    digitalWrite(PIN_LED_VERMELHO_PED, LOW);
    delay(300);
  }

  modo = 0;
}

void modocarros() {
  digitalWrite(PIN_LED_VERDE_PED, LOW);
  digitalWrite(PIN_LED_VERMELHO_PED, HIGH);
  digitalWrite(PIN_LED_VERDE_CAR, HIGH);
  digitalWrite(PIN_LED_AMARELO_CAR, LOW);
  digitalWrite(PIN_LED_VERMELHO_CAR, LOW);
}