#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_VERMELHO_PED, LOW);
    delay(300);
    digitalWrite(PIN_LED_VERMELHO_PED, HIGH);
    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_AMARELO_CAR, LOW);
    digitalWrite(PIN_LED_VERMELHO_CAR, LOW);

}