Lab 5 - SD Card

/*

  SD card file dump



 This example shows how to read a file from the SD card using the

 SD library and send it over the serial port.



 created  22 December 2010



 This example code is in the public domain.



 */



#include <SD.h>



// On the Ethernet Shield, CS is pin 4. Note that even if it's not

// used as the CS pin, the hardware CS pin (10 on most Arduino boards,

// 53 on the Mega) must be left as an output or the SD library

// functions will not work.

const int chipSelect = 12;



void setup()

{

  Serial.begin(9600);

  Serial.print("Initializing SD card...");



  // see if the card is present and can be initialized:

  if (!SD.begin(chipSelect)) {

    Serial.println("Card failed, or not present");

    // don't do anything more:

    return;

  }

  Serial.println("card initialized.");



  // open the file. note that only one file can be open at a time,

  // so you have to close this one before opening another.

  File dataFile = SD.open("datalog.txt", FILE_WRITE);
  dataFile.seek(0);
  dataFile.println("Tom Riddle");
  dataFile.close();
  dataFile = SD.open("datalog.txt");
  // if the file is available, write to the serial port:

  if (dataFile) {

    while (dataFile.available()) {

      Serial.write(dataFile.read());

    }

    dataFile.close();

  }

  // if the file isn't open, pop up an error:

  else {

    Serial.println("error opening datalog.txt");

  }

}



void loop()

{

}