const int sensorFumo = 34;
const int led = 25;

int limite = 2000;

void setup () {
  Serial.begin(115200);
  pinMode(led, OUTPUT);
  digitalWrite(led, LOW);

}

void loop() {

  int valorFumo = analogRead(sensorFumo);

  Serial.print("nivel de fumo: ");
  Serial.println(valorFumo);

  if (valorFumo >= limite){

    digitalWrite(led, HIGH);
    Serial.println("!!! ALERTA: POSSIVEL INCENDIO !!!");
  } else {

    digitalWrite(led, LOW);
    Serial.println("Situacao normal.");
  }

  delay(1000);
}