#include <SPI.h>        // Include SPI library (needed for the SD card)
#include <SD.h>         // Include SD library
#include <DHT.h>        // Include DHT sensor library
 
File dataFile;
 
#define DHTPIN A0            // DHT11 data pin is connected to Arduino pin 4
#define DHTTYPE DHT22       // DHT11 sensor is used
DHT dht(DHTPIN, DHTTYPE);   // Initialize DHT library

int relay1 = 4;
int relay2 = 7;
 
void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  while (!Serial)
    ; // wait for serial port to connect. Needed for native USB port only
  Serial.print("Initializing SD card...");
  if (!SD.begin()) 
  {
    Serial.println("initialization failed!");
    while (1);
  }
  Serial.println("initialization done.");
  delay(2000);
  dht.begin();
}
 
uint16_t line = 1;
 
void loop() {
  delay(1000);
  // Read humidity
  byte RH = dht.readHumidity();
  //Read temperature in degree Celsius
  byte Temp = dht.readTemperature();

  if (Temp>=22.00){
    digitalWrite(relay1, HIGH);
  }
  else{
    digitalWrite(relay1, LOW);
  }
  if (Temp<22.00 && Temp>=2215){
    digitalWrite(relay2, HIGH);
  }
  else{
    digitalWrite(relay2, LOW);
  }
  
  dataFile = SD.open("DHT22Log.txt", FILE_WRITE);
    // if the file opened okay, write to it:
    if (dataFile) 
    {
      Serial.print(line);
      Serial.print(":    Temperature = ");
      Serial.print(Temp);
      Serial.print("°C,    Humidity = ");
      Serial.print(RH);
      Serial.println("%");
      // Write data to SD card file (DHT11Log.txt)
      dataFile.print(line++);
      dataFile.print(":    Temperature = ");
      dataFile.print(Temp);
      dataFile.print("°C,    Humidity = ");
      dataFile.print(RH);
      dataFile.println("%");
      dataFile.close();
      
    }
    // if the file didn't open, print an error:
    else
      Serial.println("error opening DHT11Log.txt");
}