#define be 18
#define be2 5
#define bs2 17
#define bs 16
#define led1G 14
#define led2G 27
#define led1R 12
#define led2R 26

bool sbe = 0, sbe2 = 0, sbs = 0, sbs2 = 0, s = 0, d = 0;
int subindo = 0, descendo = 0; 

void setup(){
  
  pinMode(led1G, OUTPUT);
  pinMode(led1R, OUTPUT);
  pinMode(led2G, OUTPUT);
  pinMode(led2R, OUTPUT);
  pinMode(led1G, OUTPUT);
  pinMode(be, INPUT);
  pinMode(be2, INPUT);
  pinMode(bs2, INPUT);
  pinMode(bs, INPUT);
  Serial.begin(115200);
  Serial.println("iniciando...");
}

void loop(){ 

  if(digitalRead(be) == LOW && digitalRead(bs) == LOW){
    away();
  }

  if(digitalRead(be) == HIGH && digitalRead(bs) == LOW){
    delay(20);
    sub();
    sbe = 1;
  }

  if(sbe == 1){
    sub();
    if(digitalRead(bs) == HIGH && sbe == 1){
      alarme();
    }  
  }

  if(sbe == 1 && digitalRead(be2) == HIGH){
    delay(20);
    sub();
    d = 1;
    sbe2 = 1;
    subindo++;
  }

  while(d == 1){
    
    if(sbe2 == 1 && digitalRead(be2) == HIGH){
      delay(20);
      subindo++;
    }
    
    if(sbe2 == 1 && digitalRead(bs2) == HIGH){
      delay(20);
      sub();
      sbs2 = 1;
    }

    if(sbs2 == 1 && digitalRead(bs) == HIGH){
      delay(20);
      sub();
      subindo--;
      if(subindo == 0){
        delay(20);
        sbe = 0;
        sbe2 = 0;
        sbs2 = 0;
        sbs = 0;
        d = 0;
        break;
      }
    }

    if(subindo < 0){
      subindo = 0;
    }
  }
  
}

void alarme(){
  digitalWrite(led1G, HIGH);
  digitalWrite(led2G, HIGH);
  digitalWrite(led1R, HIGH);
  digitalWrite(led2R, HIGH);
  delay(500);
  digitalWrite(led1G, LOW);
  digitalWrite(led2G, LOW);
  digitalWrite(led1R, LOW);
  digitalWrite(led2R, LOW);
  delay(500);
}

void sub(){
  digitalWrite(led1G, HIGH);
  digitalWrite(led2G, LOW);
  digitalWrite(led1R, LOW);
  digitalWrite(led2R, HIGH);
}

void away(){
  digitalWrite(led1G, HIGH);
  digitalWrite(led2G, HIGH);
  digitalWrite(led1R, LOW);
  digitalWrite(led2R, LOW);  
}