The reason I bought this MicroSD board because to follow their guide and I have used the recommend code in: File > Example > SD > CardInfo also did the slight change in the code for const int chipSelect = 10;

Here is the exact code I am using:

  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 = 10;

void setup() {
  // Open serial communications and wait for port to open:

    pinMode(10, OUTPUT); // change this to 53 on a mega(don't follow this!!)
    digitalWrite(10, HIGH); // Add this line

  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) {

and this is the schematic I have used as they recommended enter image description here but the serial monitor keeps outputting Initializing SD card...initialization failed I have tried wiring again and again but I am still getting the same result.

Here are the photo of the wiring and running the test. There is something I'm not sure if it is helpful but after I upload the file and before the serial monitor output:

Initializing SD card...initialization failed. Things to check:
* is a card inserted?
* is your wiring correct?
* did you change the chipSelect pin to match your shield or module?

a red led located next to R1 of the MicroSD card starts flashing and before that output, it flashes faster then it stops and I will be presenting with that output.

Things I have tried...

  • Different card
  • Without the card
  • Tried the 3v
  • Tried using pin 4 for chipSelect

Please don't mark as duplicate because I looked at the other and I'm trying to use this guide by this company and also this guide was presenting as a solution for others and here I am using it.

Edit 1:

After the writing this question, I had to upload the file again so I can take pictures when I did that this time the serial monitor outputs:

23:02:10.089 -> 
23:02:10.089 -> Initializing SD card...initialization failed. Things to check:
23:02:12.106 -> * is a card inserted?
23:02:12.106 -> * is your wiring correct?
23:02:12.106 -> * did you change the chipSelect pin to match your shield or module?

Looks like I am stuck with that and the only number keep changing

23:11:02.769 -> 
23:11:02.769 -> Initializing SD card...initialization failed. Things to check:
23:11:04.778 -> * is a card inserted?
23:11:04.778 -> * is your wiring correct?
23:11:04.778 -> * did you change the chipSelect pin to match your shield or module?

Edit 2:

Sorry but it looks these numbers coming because I did mark the show timestamps box by mistake.

  • it looks everything ok. check the soldering of the pins of Nano.
    – Juraj
    Jun 5 '19 at 5:59
  • Juraj -Tomorrow I was going to try to test the connective of the pins at school, hopefully, it is the cause. Jun 5 '19 at 6:01
  • Also wiggle the wires in the breadboard. Sometimes they don't make an electrical connection, even thought they are fully pushed in.
    – Gerben
    Jun 5 '19 at 11:05
  • A quick question after only skimming the post, is this an older standard SDCard or one of the High Capacity SDCard which uses a different way to address internal memory?
    – st2000
    Jun 5 '19 at 12:07
  • @Juraj have checked connectives of all pins and they were good so soldering was alright. I don't know what next I should do Jun 5 '19 at 17:45

The board on the photo is Arduino Micro, not Arduino Nano. Arduino Micro doesn't have SPI on pins 11, 12, 13. Use pins MOSI, MISO and SCK.

  • MO to DI
  • MI to DO
  • SCK to CLK
  • you can use any pin as CS, only set it as parameter to SD.begin()

enter image description here enter image description here

  • I'm sorry, would you explain again! So where are these DI, DO, and CLK located in my Arduino Micro! Jun 5 '19 at 18:12
  • DI, DO and CLK are on the SD module. MISO, MOSI and SCK are on the Arduino
    – Juraj
    Jun 5 '19 at 18:13
  • Alright If this is what you meant ** MOSI - DI - pin 11 ** MISO - DO - pin 12 ** SCK - CLK - pin 13 ** CS - pin 4 : but still initialization failed! Jun 5 '19 at 18:23
  • not 11, 12, 13 !!! they don't have a number on Arduino Micro. only labels. see the picture I added to the Answer. on your board there is MO and MI
    – Juraj
    Jun 5 '19 at 18:25
  • Arduino Mini is not Arduino Micro
    – Juraj
    Jun 5 '19 at 18:32

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