/*
  SD card datalogger

 This example shows how to log data from three analog sensors
 to an SD card using the SD library.

 The circuit:
 * analog sensors on analog ins 0, 1, and 2
 * SD card attached to SPI bus as follows:
 ** MOSI - pin 11
 ** MISO - pin 12
 ** CLK - pin 13
 ** CS - pin 10 (for MKRZero SD: SDCARD_SS_PIN)

 created  24 Nov 2010
 modified 9 Apr 2012
 by Tom Igoe

 This example code is in the public domain.

 */

/*
  TM1637 DISPLAY
  Basic usage example

  Demonstrated some of the basic functionality of the library. Initialize the display, set the backlight brightness, print some text, count from 0 to 100 and print on display and blink some text.

  Note: make sure to set your serial monitor to line end: NEW LINE!

  The circuit:
  * connect TM1637 pin CLK to Arduino pin D4
  * connect TM1637 pin DIO to Arduino pin D5
  * connect TM1637 pin Vcc to Arduino pin 5V
  * connect TM1637 pin GND to Arduino pin GND

  Created 25 September 2015
  By Bram Harmsen

  https://github.com/bremme/arduino-tm1637

*/

//http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/
// Added DHTLib library on this link

//For DS3231 library
//http://www.rinkydinkelectronics.com/library.php?id=73

//https://github.com/avishorp/TM1637
#include <Arduino.h>

// include the SevenSegmentTM1637 library
#include "SevenSegmentTM1637.h"

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

#include <Wire.h>
#include "DS3231.h"

RTClib RTC;

dht DHT;

#define DHT11_PIN 2

const int chipSelect = 10;

/* initialize global TM1637 Display object
*  The constructor takes two arguments, the number of the clock pin and the digital output pin:
* SevenSegmentTM1637(byte pinCLK, byte pinDIO);
*/
const byte PIN_CLK = 4;   // define CLK pin (any digital pin)
const byte PIN_DIO = 3;   // define DIO pin (any digital pin)

SevenSegmentTM1637    display(PIN_CLK, PIN_DIO);

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(57600);
  Wire.begin();

  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  Serial.print("Initializing SD card...");

  // see if the card is present and can be initialized:
  if (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
    // don't do anything more:
    while (1);
  }
  Serial.println("card initialized.");

  display.begin();            // initializes the display
  display.setBacklight(100);  // set the brightness to 100 %
  display.print("INIT");      // display INIT on the display
  delay(1000);                // wait 1000 ms
  display.clear();

}

void loop() {
   //delay(3000);
  
   DateTime now = RTC.now();

  // make a string for assembling the data to log:
  String dataString = "";

  int chk = DHT.read11(DHT11_PIN);
  //Serial.print("Temperature = ");
  //Serial.println(DHT.temperature);
  //Serial.print("Humidity = ");
  //Serial.println(DHT.humidity);
  //delay(1000);

  // read DHT11 sensors and append to the string:
    //dataString += String("Temperature = " + DHT.temperature + " Humidity = " + DHT.humidity);
    dataString += String(now.year()) + "/" + String(now.month()) + "/" + String(now.day()) + " " + String(now.hour()) + ":" + String(now.minute()) + ":" + String(now.second()) + ",";
    
    dataString += String(DHT.temperature) + "," + String(DHT.humidity);
    
    //Serial.println(dataString);

    delay(1000);

  // open the file. note that only one file can be open at a time,
  // so you have to close this one before opening another.
  File dataFile = SD.open("datalog.txt", FILE_WRITE);

  // if the file is available, write to it:
  if (dataFile) {
    dataFile.println(dataString);
    dataFile.close();
    // print to the serial port too:
    Serial.println(dataString);

    uint8_t humidity;
    humidity = DHT.humidity;
    uint8_t temperature;
    temperature = DHT.temperature;

    display.print("T="); 
    delay(1000);  //A half second delay between steps.
    display.clear();
    display.print(temperature);                // print SUCC for success
    delay(1000);  //A half second delay between steps.
    display.clear();
    display.print("RH="); 
    delay(1000);  //A half second delay between steps.
    display.clear();
    display.print(humidity); //Display the Variable value; DHT.temperature
    delay(1000);  //A half second delay between steps.
    display.clear();
  }
  // if the file isn't open, pop up an error:
  else {
    Serial.println("error opening datalog.txt");
  }
}