/*
Voltaat learn (http://learn.voltaat.com/)
Link for full tutorial: https://bit.ly/3UmBzwH
SD Library: https://bit.ly/3E9KlZo

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;
}
}