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

#define DHTPIN 18
#define DHTTYPE DHT22

long seconds=00;
long minutes=00;
long hours=00;

int CS_pin=10;

DHT dht(DHTPIN, DHTTYPE);
File sd_file;

void setup() {
  Serial. begin (9600); 
  pinMode(CS_pin, OUTPUT);
  dht. begin();
  if (SD.begin()) {
  Serial.println("SD card is initialized. Ready to go");
  }
  else {
  Serial. println("Failed"); 
  return;
  }
  
  File sd_file = SD.open ("data.txt", FILE_WRITE);
  if (sd_file) {
  Serial. print("Time");
  Serial. print(",");
  Serial.print ("Humidity");
  Serial. print(",");
  Serial. print ("Temperature_C");
  Serial. print(",");
  Serial. print ("Temperature_F");
  Serial. print(",");
  Serial.println("Heat_index"); 
  
  sd_file.print("Time");
  sd_file.print(",");
  sd_file.print ("Humidity");
  sd_file.print(",");
  sd_file.print ("Temperature_C");
  sd_file.print(",");
  sd_file.print ("Temperature_F"); 
  sd_file.print(",");
  sd_file.println("Heat_index");
  }
sd_file.close();

}

void loop() {
  File sd_file = SD.open("data.txt",FILE_WRITE);
  if(sd_file) {
    senddata();
  }

  else {
    Serial.println("error opening file");
  }
  delay(1000);

}

void senddata () {
for(long seconds = 00; seconds < 60; seconds+=2) {
float temp = dht.readTemperature(); 
float hum = dht.readHumidity();
float fah = dht.readTemperature(true);
float heat_index = dht.computeHeatIndex(fah, hum);

sd_file.print (hours);
sd_file.print(":");
sd_file.print(minutes);
sd_file.print(":");
sd_file.print(seconds);
sd_file.print(",");
sd_file.print(hum);
sd_file.print(",");
sd_file.print(temp);
sd_file.print(",");
sd_file.print(fah);
sd_file.print(",");
sd_file.println(heat_index);

Serial.print (hours);
Serial.print(":");
Serial.print(minutes);
Serial.print(":");
Serial.print(seconds);
Serial.print(",");
Serial.print(hum);
Serial.print(",");
Serial.print(temp);
Serial.print(",");
Serial.print(fah);
Serial.print(",");
Serial.println(heat_index);

if(seconds>=58) {
  minutes++;
}

if (minutes>59) {
  hours++;
  minutes = 0;
}

sd_file.flush(); 

delay (2000);
}
sd_file.close();
}