SD Card problem

  SD card test 
 This example shows how use the utility libraries on which the'
 SD library is based in order to get info about your SD card.
 Very useful for testing a card when you're not sure whether its working or not.
 The circuit:
  * SD card attached to SPI bus as follows:
 ** MOSI - pin 11 on Arduino Uno/Duemilanove/Diecimila
 ** MISO - pin 12 on Arduino Uno/Duemilanove/Diecimila
 ** CLK - pin 13 on Arduino Uno/Duemilanove/Diecimila
 ** CS - depends on your SD card shield or module. 
    Pin 4 used here for consistency with other Arduino examples

 created  28 Mar 2011
 by Limor Fried 
 modified 9 Apr 2012
 by Tom Igoe
 // include the SD library:
#include <SD.h>
#include <SPI.h>

// set up variables using the SD utility library functions:
Sd2Card card;
SdVolume volume;
SdFile root;

// change this to match your SD shield or module;
// Arduino Ethernet shield: pin 4
// Adafruit SD shields and modules: pin 10
// Sparkfun SD shield: pin 8
const int chipSelect = 4;    

void setup()
 // Open serial communications and wait for port to open:
   while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only

  Serial.print("\nInitializing SD card...");
  // On the Ethernet Shield, CS is pin 4. It's set as an output by default.
  // Note that even if it's not used as the CS pin, the hardware SS pin 
  // (10 on most Arduino boards, 53 on the Mega) must be left as an output 
  // or the SD library functions will not work. 
  pinMode(53, OUTPUT);     // change this to 53 on a mega

  // we'll use the initialization code from the utility libraries
  // since we're just testing if the card is working!
  if (!card.init(SPI_HALF_SPEED, chipSelect)) {
    Serial.println("initialization failed. Things to check:");
    Serial.println("* is a card is inserted?");
    Serial.println("* Is your wiring correct?");
    Serial.println("* did you change the chipSelect pin to match your shield or module?");
  } else {
   Serial.println("Wiring is correct and a card is present."); 

  // print the type of card
  Serial.print("\nCard type: ");
  switch(card.type()) {
    case SD_CARD_TYPE_SD1:
    case SD_CARD_TYPE_SD2:

  // Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32
  if (!volume.init(card)) {
    Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");

  // print the type and size of the first FAT-type volume
  uint32_t volumesize;
  Serial.print("\nVolume type is FAT");
  Serial.println(volume.fatType(), DEC);
  volumesize = volume.blocksPerCluster();    // clusters are collections of blocks
  volumesize *= volume.clusterCount();       // we'll have a lot of clusters
  volumesize *= 512;                            // SD card blocks are always 512 bytes
  Serial.print("Volume size (bytes): ");
  Serial.print("Volume size (Kbytes): ");
  volumesize /= 1024;
  Serial.print("Volume size (Mbytes): ");
  volumesize /= 1024;

  Serial.println("\nFiles found on the card (name, date and size in bytes): ");
  // list all files in the card with date and size | LS_DATE | LS_SIZE);

void loop(void) {

And the result is good

Initializing SD card...Wiring is correct and a card is present.

Card type: SDHC

Volume type is FAT32

Volume size (bytes): 3644850176
Volume size (Kbytes): 3559424
Volume size (Mbytes): 3476

Files found on the card (name, date and size in bytes): 
LOG.TXT       2000-01-01 01:00:00 77
SYSTEM~1/     2015-07-23 03:53:56
  INDEXE~1      2015-07-23 03:53:56 76
LOG.CSV       2015-07-25 12:56:34 884

I tried the code that is made by jeremy blum
that could be found here

I put on the SPI library also

//Program by Jeremy Blum
//SD Card Demonstration
//Based on Example by Tom Igoe

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

//Set by default for the SD Card Library
//MOSI = Pin 11
//MISO = Pin 12
//SCLK = PIN 13
//We always need to set the CS Pin
int CS_pin = 10;
int pow_pin = 8;

void setup()
  Serial.println("Initializing Card");
  //CS Pin is an output
  pinMode(CS_pin, OUTPUT);
  //Card will Draw Power from Pin 8, so set it high
  pinMode(pow_pin, OUTPUT);  
  digitalWrite(pow_pin, HIGH);
  if (!SD.begin(CS_pin))
      Serial.println("Card Failure");
  Serial.println("Card Ready");

void loop()
  String dataString = "Hello";
  //Open a file to write to
  //Only one file can be open at a time
  File dataFile ="log.txt", FILE_WRITE);
  if (dataFile)
    Serial.println("Couldn't open log file");

and this is what i get

Initializing Card
Card Failure
Couldn't open log file

I don’t know what happen :S it used to work with this code

I’m using arduino mega 2560 with SD card shield (something wtih SD Shield 3.0 writing on it)

I’ve tried to change the pin on the code but nothing works
Currently downloading the Sdfat library, somebody on the internet said that it could work


In the first program the chip select pin is 4, in the second program it is 10.

Both are valid values depending on your hardware - but only one can be valid.

If you have not changed any hardware you had better change the chip select value in the second program from 10 to 4. Then try again.

Change this:

int CS_pin = 10;

to this:

int CS_pin = 4;


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