// YL-39 + YL-69 humidity sensor
byte humidity_sensor_pin = A1;
byte humidity_sensor_vcc = 6;

boolean status=LOW; //Estado del led
int led = 9;

void setup() {
  // Init the humidity sensor board
  pinMode(humidity_sensor_vcc, OUTPUT);
  digitalWrite(humidity_sensor_vcc, LOW);
 
  // Setup Serial
  while (!Serial);
  delay(1000);
  Serial.begin(9600);
}

int read_humidity_sensor() {
  digitalWrite(humidity_sensor_vcc, HIGH);
  delay(100);
  int value = analogRead(humidity_sensor_pin);
  digitalWrite(humidity_sensor_vcc, LOW);
  return 1023 - value;
}

void loop() {
  //Serial.print("Humidity Level (0-1023): ");
  //Serial.println(read_humidity_sensor()); 
  Serial.write(read_humidity_sensor());
  
  if(Serial.available()>0)//Si el Arduino recibe datos a través del puerto serie
  {
    byte dato = Serial.read(); //Los almacena en la variable "dato"
    if(dato==65)  //Si recibe una "A" (en ASCII "65")
    {
      status=!status; //Cambia el estatus del led
    }
    digitalWrite(led,status);
  }
  //delay(10000);
}