/* How to use the DHT-22 sensor with Arduino uno
   Temperature and humidity sensor
   More info: http://www.ardumotive.com/how-to-use-dht-22-sensor-en.html
   Dev: Michalis Vasilakis // Date: 1/7/2015 // www.ardumotive.com */

//Libraries
#include <DHT.h>;
#include <Wire.h> // I2C程式庫
#include <LiquidCrystal_I2C.h> // LCD_I2C模組程式庫
#include <Servo.h>

//Constants
#define DHTPIN 7     // what pin we're connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz Arduino
DHT dht2(A5, DHTTYPE);
// LCD I2C位址，默認為0x27或0x3F，依據背板的晶片不同而有差異，16、2為LCD顯示器大小。
LiquidCrystal_I2C lcd(0x27, 20, 4); 
Servo myservo;  // create servo object to control a servo
//Variables
float hum;  //Stores humidity value
float temp; //Stores temperature value
float device_temp; //Stores temperature of device
int status = 0;
void setup()
{
  Serial.begin(9600);
	dht.begin();
  dht2.begin();
  myservo.attach(9);
  
}

void loop()
{   
    //read the humidity and temperature values from the DHT sensor and store them to variables
    hum = dht.readHumidity();  //humidity value
    temp= dht.readTemperature();//temperature value
    Serial.println("Humidity: "+String(hum,2)+" %  "+"Temp: "+String(temp,2)+" Celsius");//print values
    delay(2000); //Delay 2 sec.
    if((hum>65 && temp>30) && dht2.readTemperature()<80){//if humidity>65% and temperature>30, and the fan is not too hot
      myservo.write(map(2, 0, 2, 90, 180));//rotates servo to adjust the fan to mode 2 
      status = 2;
    }else if((hum>65 || temp>30) && dht2.readTemperature()<80){//if humidity>65% or temperature>30
      myservo.write(map(1, 0, 2, 90, 180));//rotates servo to adjust the fan to mode 1  
    }else{//humidity<65% and temperature<30 or the fan is too hot
      myservo.write(map(0, 0, 2, 90, 180));//rotates servo to turn off the fan
    }
}



//https://www.instructables.com/How-to-use-DHT-22-sensor-Arduino-Tutorial/
//https://crazymaker.com.tw/arduino-lcd-i2c-tutorial/