#include "DHT.h"
#include <Servo.h>

#define DHTPIN 2     
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
#define SERVOPIN 9

DHT dht(DHTPIN, DHTTYPE);
Servo myservo;  // create servo object to control a servo
int is_open;
const int sensorPin = A0;
const float GAMMA = 0.7;
const float RL10 = 50;
int pos = 0;    // variable to store the servo position

void setup() {
  Serial.begin(9600);
  dht.begin();
  myservo.attach(SERVOPIN);
  is_open = false;
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Check if any reads failed and exit early (to try again).
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
  // Serial.print(F("Humidity: "));
  // Serial.print(humidity);
  // Serial.print(F("%  Temperature: "));
  // Serial.print(temperature);
  // Serial.println(F("°C "));



  // Read the Photoresistor sensor value
  int sensorReading = analogRead(sensorPin);

  // Convert the analog value into lux value
  float voltage = sensorReading / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, ( 1 / GAMMA));



  if(!is_open && (humidity >= 60 || lux >= 300)){
    // OPEN THE Umbrella
    Serial.print(F("Openning"));
    is_open = true;
    for (pos = 0; pos <= 180; pos += 1) {
      myservo.write(pos);
      delay(15);
    }
  }
  else if(is_open && !(humidity >= 60 || lux >= 300)){
    // CLOSE THE Umbrella
    Serial.print(F("Closing"));
    is_open = false;
    for (pos = 180; pos >= 0; pos -= 1) {
      myservo.write(pos);
      delay(15);
    }
  }

  // Wait a few seconds between measurements.
  delay(2000);
}