Can't save data to SD card

Using Arduino Programming Questions
#1 
#define SENSOR 2 // define pint 2 for sensor
#define ACTION 9 // define pin 9 as for ACTION
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <SoftwareSerial.h>
#include <SPI.h>
#include <SD.h>
File myFile;
const int chipSelect = 4;

SoftwareSerial BTserial(0, 1);
LiquidCrystal_I2C lcd(0x27,20, 4);
float value=0;
float rev=0;
int rpm;
int spd;
int oldtime=0;
int time;
int mnt;
int met;
int Count = digitalRead(ACTION);

void isr() 
{
rev++;
}
void cnt() //count
{
  Count++;
}

int inPinA = 8;
int inPinB = 7;
int inPinC = 6;
int inPinD = 5;
int outPin = 13;
int readingA;
int readingB;
int readingC;
int readingD;
int n = 39;
int debounce=200;
int previous;
int ttm;
float Call;
float ccnt;
int readdata = 0;


void setup() {
  
  
  pinMode(SENSOR, INPUT_PULLUP);
  pinMode(ACTION, OUTPUT);
  attachInterrupt(0,isr,RISING);  //attaching the interrupt
  attachInterrupt(1,cnt,FALLING);  //attaching the interrupt
  BTserial.begin(38400);

  pinMode(inPinA, INPUT);
  pinMode(inPinB, INPUT);
  pinMode(inPinC, INPUT);
  pinMode(inPinD, INPUT);
  pinMode(outPin, OUTPUT);
  lcd.begin();
lcd.setCursor(0,0);
lcd.print("NERASUAN  UNIVERSITY");
delay(1500);
lcd.setCursor(5,2);
lcd.print("ELECTRICAL");
lcd.setCursor(0,3);
lcd.print("ENGINEERING PROJECTS");
delay(2500);
lcd.clear();
  lcd.setCursor(1,0);
lcd.print("PLEASE SELECT YOUR ");
lcd.setCursor(0,1);
lcd.print("WEIGHT, PRESS BUTTON");
lcd.setCursor(0,3);
lcd.print("BETWEEN 40 TO 90 Kg");

readdata = 1;


}
void Setdata()
{
  
 readingA = digitalRead(inPinA);
 readingB = digitalRead(inPinB);
 readingC = digitalRead(inPinC);
 if (readingA == HIGH && millis() - time > debounce ) //A_______________________________________
        {
          lcd.clear();
          time=millis();
          n = n+1;
                    
          if (n >= 90 )
          {
            n = 90;
          }
          lcd.setCursor(5,0);
          lcd.print("YOUR WEIGHT");
          lcd.setCursor(5,2);
          lcd.print(n);
          lcd.setCursor(8,2);
          lcd.print("KILOGRAM");   
          
        }
    if (readingB == HIGH && millis() - time > debounce) //B_________________________________________
      {
        lcd.clear();
        time = millis();
        n = n-1;        
        if (n <= 40 )
        {
          n = 40;
        }
          lcd.setCursor(5,0);
          lcd.print("YOUR WEIGHT");
          lcd.setCursor(5,2);
          lcd.print(n);
          lcd.setCursor(8,2);
          lcd.print("KILOGRAM");
        digitalWrite(outPin, n);
        previous = readingA;
        
        }
  
 if (readingC == HIGH && millis() - time > debounce) //C ______________________________________________
        {
          lcd.clear();
          time = millis();
          lcd.setCursor(0,0);
          lcd.print("YOUR  SELECT  WEIGHT");
          lcd.setCursor(5,2);
          lcd.print(n);
          lcd.setCursor(8,2);
          lcd.print("KILOGRAM");
          delay(2000);
          lcd.setCursor(8,3);
          lcd.print("START IN");
          lcd.setCursor(18,3);
          lcd.print("3");
          delay(1250);
          lcd.setCursor(18,3);
          lcd.print("2");
          delay(1250);
          lcd.setCursor(18,3);
          lcd.print("1");
          delay(1250);
          lcd.clear();
         readdata = 0; 
        }

}


void BTandCal()
{
  readingA = digitalRead(inPinA);
  mnt++;
//------------------------------------------ SPEED
delay(1000);
detachInterrupt(0);           //detaches the interrupt
time=millis()-oldtime;        //finds the time 
rpm=(rev/time)*60000;         //calculates rpm
spd=rpm*0.10472*0.3*5;         //calculate speed     
oldtime=millis();             //saves the current time
rev=0;
int sspd=spd/2;
float ccnt=Count*2*3.14159*0.3;
int ttm=mnt/60;
float call;
if (sspd >= 0 && sspd < 10)
{
  met = 3.2;
}
if (sspd >= 10 && sspd < 15)
{
  met = 4.8;
}
if (sspd >= 15 && sspd < 20)
{
  met = 5.9;
}
if (sspd >= 20 && sspd < 25)
{
  met = 7.1;
}
if (sspd >= 25 && sspd < 30)
{
  met = 8.4;
}

if (sspd ==0 )
{
  if (ccnt == 0)
  {
    call = 0;
  }
  else 
  {
    call = call;
  }
}
else
{
  call=0.0175*n*mnt*met/60;
}

lcd.clear();
lcd.setCursor(0,0);
lcd.print("SPEED");
lcd.setCursor(10,0);
lcd.print(sspd);
lcd.setCursor(15,0);
lcd.print("KM/HR");
attachInterrupt(0,isr,RISING);

//------------------------------------------ ROUND
lcd.setCursor(0,1);
lcd.print("DISTANCE");
lcd.setCursor(9,1);
lcd.print(ccnt);
lcd.setCursor(18,1);
lcd.print("M");
//-------------------------------------------- TIME
lcd.setCursor(0,2);
lcd.print("TIME");
lcd.setCursor(10,2);
lcd.print(    ttm);
lcd.setCursor(17,2);
lcd.print("MIN");
//-------------------------------------------- CALORIES BURN
lcd.setCursor(0,3);
lcd.print("CALORIES");
lcd.setCursor(10,3);
lcd.print( call);
lcd.setCursor(16,3);
lcd.print("KCAL");

BTserial.print("<");
BTserial.print(sspd);
BTserial.print(",");
BTserial.print(ccnt);
BTserial.print(",");
BTserial.print(ttm);
BTserial.print(",");
BTserial.print(call);
BTserial.print(">");

if (readingD == HIGH && millis() - time > debounce)
{
  lcd.clear();
  time = millis();
  lcd.setCursor(0,0);
  lcd.print("START SAVE RESULTS");
  delay(1000);
  readdata = 2;        
}
}

void SaveResults()
{
  pinMode(SS, OUTPUT);
  lcd.clear();  
  lcd.setCursor(0,0);
  lcd.print("Initializing SD Card");
if (!SD.begin(chipSelect)) 
  {
    lcd.clear();  
    lcd.setCursor(0,0);
    lcd.print("Initializing SD Card");
    lcd.setCursor(5,1);
    lcd.print("= failed!");
    return;
  }
    lcd.clear();  
    lcd.setCursor(0,0);
    lcd.print("Initializing SD Card");
    lcd.setCursor(5,1);
    lcd.print("= DONE!");
myFile = SD.open("test.txt", FILE_WRITE);
if (myFile) 
   {
    lcd.clear();  
    lcd.setCursor(0,1);
    lcd.print("SAVED");
    //---------------------------------------------
    myFile.println("Results for weight ");
    myFile.print(n);
    myFile.print(" Kilogram");
    myFile.println( );
    
    myFile.println("Time = ");
    myFile.print(ttm);
    myFile.print(" Minute"); 
    
    myFile.println("Distance = ");
    myFile.print(ccnt);
    myFile.print(" Metre");
    
    myFile.println("Calories Burn = ");
    myFile.print(Call);
    myFile.print(" KCal");

    myFile.println("SAVE COMPLETE");
    
    myFile.close();
    //---------------------------------------------
   } 
else 
   {
    lcd.clear();  
    lcd.setCursor(0,1);
    lcd.print("error opening file!");
   }
  readdata = 3;
}



void Finished()
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("DONE");
lcd.setCursor(0,1);
lcd.print("PLEASE PRESS");
lcd.setCursor(0,2);
lcd.print("RESET BUTTON");
}



void loop() 
{
while (readdata == 1)
{
Setdata();

}
while (readdata == 0)
{
  BTandCal();

}
while (readdata == 2)
{
  SaveResults();
}
while (readdata == 3)
{
  Finished();
}
}

I want to save data (ccnt,ttm,call,) to my SD card and this is my code .

What i wrong about saving data ?

#2 
SoftwareSerial BTserial(0, 1);

Doing software serial on the hardware serial pins is dumb.

int Count = digitalRead(ACTION);

Reading the state of a pin before the hardware is set up is silly.

Variables used in ISRs and other functions, such as rev and Count, MUST be declared volatile.

As for why your program doesn't work, we can't tell you. You didn't tell us what it actually does, or if it even compiles.

#3

This device check rpm from bicycle wheel and calculate and measure distance , calories , speed so I want to save that data to SD card .

#4

does it read? did you try the examples? what does the CardInfo diagnostics example print?

#5

Initializing SD card...
Card type: SDHC

Volume type is FAT32

Volume size (bytes): 2696937472
Volume size (Kbytes): 2633728
Volume size (Mbytes): 2572

Files found on the card (name, date and size in bytes):

this is CardInfo example sir.

#6

JXMES:
This device check rpm from bicycle wheel and calculate and measure distance , calories , speed so I want to save that data to SD card .

That is what you want the program to do. It says NOTHING about what the program actually does, or if it even compiles. Quit wasting our time, and answer the questions you are asked.

#7