Example Code for Arduino-MicroSD Card Info

Hardware Preparation

• DFR0850 Ethernet and PoE Shield for Arduino x 1
• DFR0221 DFRduino Leonardo with Xbee Socket x 1
• FIT0394 MicroSD Card x 1

Software Preparation

• Download Arduino IDE: Click to download Arduino IDE

Wiring Diagram

• First install the POE Ethernet expansion board on the Leonardo board and insert the MicroSD card into the MicroSD card slot of the POE Ethernet expansion board, then plug the Micro USB cable into the Leonardo, and connect the other end to the computer USB port.

  

Sample Code

    /*
      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>

    // 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:
      Serial.begin(9600);
       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(10, 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?");
        return;
      } 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:
          Serial.println("SD1");
          break;
        case SD_CARD_TYPE_SD2:
          Serial.println("SD2");
          break;
        case SD_CARD_TYPE_SDHC:
          Serial.println("SDHC");
          break;
        default:
          Serial.println("Unknown");
      }

      // 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");
        return;
      }
      // 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);
      Serial.println();

      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.println(volumesize);
      Serial.print("Volume size (Kbytes): ");
      volumesize /= 1024;
      Serial.println(volumesize);
      Serial.print("Volume size (Mbytes): ");
      volumesize /= 1024;
      Serial.println(volumesize);


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

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


    void loop(void) {

    }

Result

Open the serial port monitor window to view the SD card information, including whether the card is present, its type, volume type, and size. The expected output includes messages like "Wiring is correct and a card is present." and details about the card's specifications.