Micro SD card not initializing

Hi all,

I have a Bluno MEGA 1280 from DFrobot, with a I/O expansion shield attached with a microSD card module. I’ve been trying to run the “CardInfo.h” example to see if my SD card can be read. Every time I try uploading the sketch to my controller, I always get the message “Initializing SD card…initialization failed. Things to check:”. I have a 32GB microSD, and it’s formatted to FAT32. The sketch is below:

  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 <SPI.h>
#include <SD.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 native USB port only

  Serial.print("\nInitializing SD card...");

  // 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 inserted?");
    Serial.println("* is your wiring correct?");
    Serial.println("* did you change the chipSelect pin to match your shield or module?");
    while (1);
  } else {
    Serial.println("Wiring is correct and a card is present.");

  // print the type of card
  Serial.print("Card 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");
    while (1);

  Serial.print("Clusters:          ");
  Serial.print("Blocks x Cluster:  ");

  Serial.print("Total Blocks:      ");
  Serial.println(volume.blocksPerCluster() * volume.clusterCount());

  // print the type and size of the first FAT-type volume
  uint32_t volumesize;
  Serial.print("Volume 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 /= 2;                           // SD card blocks are always 512 bytes (2 blocks are 1KB)
  Serial.print("Volume size (Kb):  ");
  Serial.print("Volume size (Mb):  ");
  volumesize /= 1024;
  Serial.print("Volume size (Gb):  ");
  Serial.println((float)volumesize / 1024.0);

  Serial.println("\nFiles found on the card (name, date and size in bytes): ");

  // list all files in the card with date and size
  root.ls(LS_R | LS_DATE | LS_SIZE);

void loop(void) {

Does anyone think if this is a coding issue? Or could it be a hardware issue? I’ve been struggling with this for the past few days and seem to be getting nowhere.

Did you read the post at the top of the forum;

Don't Format SD cards with OS utilities!

how did you wire it?

Did you read the post at the top of the forum;

Don't Format SD cards with OS utilities!

Thank you for the reminder! I tried it this way and am still getting similar outcomes.

how did you wire it?

You can see from the pictures below. The controller is a Bluno MEGA 1280:

The I/O expansion shield sits on top of the MEGA 1280, connecting to digital pins 0-13, and analog pins 0-5:

The MicroSD card module is then connected to the dedicated SD pins on the expansion shield:

Mega doesn’t have SPI on same pins as Uno. other shields use the ICSP header in the middle of the board to connect to SPI

Mega doesn't have SPI on same pins as Uno. other shields use the ICSP header in the middle of the board to connect to SPI

What does that mean?

What does that mean?

If you have not done so already, download and keep a pinout diagram for the UNO and Mega.

Then compare the UNO and Mega pinouts and see where the SPI pins, SCK, MOSI and MISO are.