LCD I2C 2004 + RTC + DHT11 + SDCARD // Recording 2 DHT11 every minute

#include <Wire.h>

#include <RTC.h>
static DS1307 RTC;

#include <SPI.h>
#include <SD.h>

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);

#include "DHT.h"
#define dht_int A2
#define dht_ext A1
#define DHTTYPE DHT11
DHT dht1(dht_int, DHTTYPE);
DHT dht2(dht_ext, DHTTYPE);

//*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*//
  File myFile;

  void save_temperature() {
  myFile = SD.open("temp.txt", FILE_WRITE);

  float h1 = dht1.readHumidity();
  float t1 = dht1.readTemperature();
  float f1 = dht1.readTemperature(true);
  float h2 = dht2.readHumidity();
  float t2 = dht2.readTemperature();
  float f2 = dht2.readTemperature(true);

  if (RTC.getDay()<10){
  myFile.print(0);
  }
  myFile.print(RTC.getDay());
  myFile.print("-");
  if (RTC.getMonth()<10){
  myFile.print(0);
  }
  myFile.print(RTC.getMonth());
  myFile.print(",");
  if (RTC.getHours()<10){
  myFile.print(0);
  myFile.print(RTC.getHours());
  myFile.print(":");
  if (RTC.getMinutes()<10){
  myFile.print(0);
  }
  myFile.print(RTC.getMinutes());
/*  myFile.print(":");
  if (RTC.getSeconds()<10){
  myFile.print(0);
  }
  myFile.print(RTC.getSeconds());
  */
  myFile.print(",");
  myFile.print("T+H_INT:,");
  myFile.print(t1);
  myFile.print(",");
  myFile.print(h1);
  myFile.print(",");
  myFile.print("T+H_EXT:,");
  myFile.print(t2);
  myFile.print(",");
  myFile.println(h2);
  myFile.close();
}
}
//*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*//
  void lcd_display_temp(){

  float h1 = dht1.readHumidity();
  float t1 = dht1.readTemperature();
  float f1 = dht1.readTemperature(true);
  float h2 = dht2.readHumidity();
  float t2 = dht2.readTemperature();
  float f2 = dht2.readTemperature(true);

  lcd.setCursor(0,1);
  lcd.print("INT:");
  lcd.print(t1);
  lcd.print("C ");
  lcd.print("H:");
  lcd.print(h1);
  lcd.print("%");

  lcd.setCursor(0,2);
  lcd.print("EXT:");
  lcd.print(t2);
  lcd.print("C ");
  lcd.print("H:");
  lcd.print(h2);
  lcd.print("%");
  }
//*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*//
  void lcd_display_time() {

  float h1 = dht1.readHumidity();
  float t1 = dht1.readTemperature();
  float f1 = dht1.readTemperature(true);
  float h2 = dht2.readHumidity();
  float t2 = dht2.readTemperature();
  float f2 = dht2.readTemperature(true);

  lcd.setCursor(0,0);
  if (RTC.getDay()<10){
  lcd.print(0);
  }
  lcd.print(RTC.getDay());
  lcd.print("-");
  if (RTC.getMonth()<10){
  lcd.print(0);
  }
  lcd.print(RTC.getMonth());
  lcd.print("-");
  lcd.print(RTC.getYear());

  lcd.print(" ");
  if (RTC.getHours()<10){
  lcd.print(0);
  }
  lcd.print(RTC.getHours());
  lcd.print(":");
  if (RTC.getMinutes()<10){
  lcd.print(0);
  }
  lcd.print(RTC.getMinutes());

/*lcd.print(":");
  if (RTC.getSeconds()<10){
  lcd.print(0);
  }
  lcd.print(RTC.getSeconds());
  */
  }
//*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*//
void setup()
{
  Serial.begin(9600);
  RTC.begin();
  Wire.begin();
  dht1.begin();
  dht2.begin();
  SD.begin(10);
  delay(100);
  lcd.init();
  lcd.backlight();

/*  Serial.print("Initializing SD card...");
  if (!SD.begin(10)) {
  Serial.println("initialization failed!");
  while (1);
  }
  Serial.println("initialization done.");
*/
}
//*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*//
void loop()
{
  save_temperature();
  lcd_display_time();
  lcd_display_temp();

  delay(60000);
}