/*
 Voltaat learn (http://learn.voltaat.com/)
 Link for full tutorial:
 SD Library:

 Connections from the Arduino SD card module:
 • Arduino GND pin → SD card module GND pin (- pin)
 • Arduino 5V pin → SD card module VCC pin (+pin)
 • Arduino pin 12 → SD card module MISO pin
 • Arduino pin 11 → SD card module MOSI pin
 • Arduino pin 13 → SD card module SCK pin
 • Arduino pin 4 → SD card module CS pin
*/

//This library allows you to communicate with SPI devices
#include "SPI.h"

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

//Define SD card module cs to arduino digital pin 4
const int cs = 4;

//Define txt and temp vairables
String txt = "" , temp;

//Define incoming variable with type char
char incoming ;

//Define dataFile variable
File dataFile ;

//Define variables
boolean ReadFile = true;
String varName1 = "Time now";
String varName2 = "Date";
String varName3 = "Temperature";
String varName4 = "Humidity";

//Define variables
String Time;
String Date;
float Temperature;
float Humidity;

// Commands inside void setup run once.
void setup()
{
 //Start the serial monitor at 9600 baud rate (9600 bits per second)
 Serial.begin(9600);

 //Function we made to see if the card is present and can be initialized
 Initialize_SDcard();

 //Open a file in SD card in reading mode
 dataFile = SD.open("LOGGERCD.txt");

}

//Commands inside void loop run forever
void loop()
{

 if ( ReadFile) {
   if (dataFile)
   {
     //dataFile.avaialable() check if there are any bytes avialable for reading from the file
     while (dataFile.available())
     {
       //Read from the file
       incoming = dataFile.read();

       if (incoming != '\n')
         txt = txt + incoming;

       else {
         //Print to serial monitor
         Serial.println(txt);

         if ( txt.indexOf(varName1) >= 0 ) {
           //Function uncction to get a substring of a Stringfor example myString.substring(from, to)
           String msg = txt.substring(txt.indexOf(varName1) + varName1.length(), txt.indexOf(varName2));
           //Function to get a version of the String with any leading and trailing whitespace removed
           msg.trim();
           Time = msg;
           //Print to serial monitor
           Serial.print(varName1 + " : ");
           Serial.println(Time);
         }


         if ( txt.indexOf(varName2) >= 0 ) {
           //Function uncction to get a substring of a Stringfor example myString.substring(from, to)
           String msg = txt.substring(txt.indexOf(varName2) + varName2.length(), txt.indexOf(varName3));
           //Function to get a version of the String with any leading and trailing whitespace removed
           msg.trim();
           Date = msg;
           //Print to serial monitor
           Serial.print(varName2 + " : ");
           Serial.println(Date);
         }


         if ( txt.indexOf(varName3) >= 0 ) {
           //Function uncction to get a substring of a Stringfor example myString.substring(from, to)
           String msg = txt.substring(txt.indexOf(varName3) + varName3.length(), txt.indexOf(varName4));
           //Function to get a version of the String with any leading and trailing whitespace removed
           msg.trim();
           Temperature = msg.toFloat();
           //Print to serial monitor
           Serial.print(varName3 + " : ");
           Serial.println(Temperature);
         }


         if ( txt.indexOf(varName4) >= 0 ) {
           //Function uncction to get a substring of a Stringfor example myString.substring(from, to)
           String msg = txt.substring(txt.indexOf(varName4) + varName4.length());
           //Function to get a version of the String with any leading and trailing whitespace removed
           msg.trim();
           Humidity = msg.toFloat();
           //Print to serial monitor
           Serial.print(varName4 + " : ");
           Serial.println(Humidity);
         }

         txt = ""; // clearing the char
       }


     }
     dataFile.close(); //Close the file
   }

   else
     //Print to serial monitor
     Serial.println(" SD card reading failed");


   ReadFile = false;
 }
}

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