#define LED_ROXO 10
#define LED_LARANJA 9
#define LED_AMARELO 8
#define BOT_UP 13
#define BOT_DOWN 12

int nivel = 1;
bool BOTAO_UP, BOTAO_DOWN;


void setup() {

  pinMode(LED_ROXO, OUTPUT);
  pinMode(LED_LARANJA, OUTPUT);
  pinMode(LED_AMARELO, OUTPUT);    
  pinMode(BOT_UP, INPUT);    
  pinMode(BOT_DOWN, INPUT); 


}

void loop() {
  
  BOTAO_UP = digitalRead(BOT_UP);
  BOTAO_DOWN = digitalRead(BOT_DOWN);

  if (BOTAO_UP == true){
    nivel++;   
  }
  
  if (BOTAO_DOWN == true){
    nivel--;
  }

  if (nivel <= 0){
    nivel = 3;
  } 
  if (nivel >= 4){
    nivel = 1;
  }

  if (nivel == 1){
    digitalWrite(LED_ROXO, HIGH);
    digitalWrite(LED_LARANJA, LOW);
    digitalWrite(LED_AMARELO, LOW); 
  }
  if(nivel == 2){
    digitalWrite(LED_ROXO, LOW);
    digitalWrite(LED_LARANJA, HIGH);
    digitalWrite(LED_AMARELO, LOW); 
  }
  if(nivel == 3){
    digitalWrite(LED_ROXO, LOW);
    digitalWrite(LED_LARANJA, LOW);
    digitalWrite(LED_AMARELO, HIGH); 
  }

  if (BOTAO_DOWN == true or BOTAO_UP == true){
    delay(300);
  }
}