This is a simple tutorial on how to use a SD card with Arduino. On this tutorial, we used the Breakout Board for SD-MMC Cards from SparkFun.

First, get a SD Card, put in your computer and create a text file named "test.txt" in the card root.
Get your protoboard and connect the breakout board to your Arduino using the schematic above. The resistors will work as a voltage divider for adapt the voltage level from Arduino (5V) to the SD Card (3.3V).

Then, download the SD Fat library and extract to the libraries folder of your Arduino installation.

Open the Arduino IDE and go to File > Examples > SD Fat and open the ReadWriteSDFat example. In the source code, change the chipSelect value to 10 (highlighted in red). The source code should be:

// Ported to SdFat from the native Arduino SD library example by Bill Greiman

// On the Ethernet Shield, CS is pin 4. SdFat handles setting SS
const int chipSelect = 10;
/*
SD card read/write

This example shows how to read and write data to and from an SD card file
The circuit:
* SD card attached to SPI bus as follows:
** MOSI - pin 11
** MISO - pin 12
** CLK - pin 13
** CS - pin 4

created Nov 2010
by David A. Mellis
updated 2 Dec 2010
by Tom Igoe
modified by Bill Greiman 11 Apr 2011
This example code is in the public domain.

*/
#include <SdFat.h>
SdFat sd;
SdFile myFile;

void setup() {
Serial.begin(9600);

// Initialize SdFat or print a detailed error message and halt
// Use half speed like the native library.
// change to SPI_FULL_SPEED for more performance.
if (!sd.init(SPI_HALF_SPEED, chipSelect)) sd.initErrorHalt();

// open the file for write at end like the Native SD library
if (!myFile.open("test.txt", O_RDWR | O_CREAT | O_AT_END)) {
sd.errorHalt("opening test.txt for write failed");
}
// if the file opened okay, write to it:
Serial.print("Writing to test.txt...");
myFile.println("testing 1, 2, 3.");

// close the file:
myFile.close();
Serial.println("done.");

// re-open the file for reading:
if (!myFile.open("test.txt", O_READ)) {
sd.errorHalt("opening test.txt for read failed");
}
Serial.println("test.txt:");

// read from the file until there's nothing else in it:
int data;
while ((data = myFile.read()) > 0) Serial.write(data);
// close the file:
myFile.close();
}

void loop() {
// nothing happens after setup
}

 

 

Now, upload the code to your Arduino board and after that open your Serial Monitor.

If everything went right, you will see a "writing to test.txt" and "testing 1,2,3" messages in the Serial Monitor window. So, get your SD card and check in your computer if there is something in the test.txt file.

 

 

References: 

http://code.google.com/p/sdfatlib/

http://arduino.cc/playground/  

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1206874649

Views: 72369

Comment

You need to be a member of GarageLab (arduino, electronics, robotics, hacking) to add comments!

Join GarageLab (arduino, electronics, robotics, hacking)

Latest Activity

Marco is now a member of GarageLab (arduino, electronics, robotics, hacking)
yesterday
Muhammad Ali commented on Marcelo Rodrigues's blog post Arduino generated VGA (color) signal - Complete!
"Thanks for the advice. I will persist with the code till I get it done. thanks once again."
Apr 18
Marcelo Rodrigues commented on Marcelo Rodrigues's blog post Arduino generated VGA (color) signal - Complete!
""The output waveforms on oscilloscope for Hsync and Vsync and for that matter RGB pins are not…"
Apr 17
Muhammad Ali commented on Marcelo Rodrigues's blog post Arduino generated VGA (color) signal - Complete!
"Hi  Marcelo I am trying to make this code work with Attiny 44a operating @ 20 MHz. I have…"
Apr 17
Profile IconReal NOiseux, Muhammad Ali, bob v and 1 more joined GarageLab (arduino, electronics, robotics, hacking)
Apr 17
baiqian is now a member of GarageLab (arduino, electronics, robotics, hacking)
Apr 10
Profile IconDavide and Almas Amandossov joined GarageLab (arduino, electronics, robotics, hacking)
Apr 6
Profile Iconvamoalrenga and John Ferrell joined GarageLab (arduino, electronics, robotics, hacking)
Apr 3
Marcelo Rodrigues replied to FiniousFingers's discussion New to group
"Yes, please share your progress here. Thanks and good"
Mar 27
FiniousFingers replied to FiniousFingers's discussion New to group
"Thanks, good to know someone is out there. I will be…"
Mar 27
Edward Evans replied to GarageLab's discussion Serious claims against BeagleBone's manufacturer CircuitCo
"Have you moved forward with any action?  I would be interested in discussing your…"
Mar 27
Marcelo Rodrigues replied to GarageLab's discussion Serious claims against BeagleBone's manufacturer CircuitCo
"Ed, No, they didn't deliver yet.  :( Good luck for us all."
Mar 23
Profile IconWesenachin Asfaw and Muhammad Basil joined GarageLab (arduino, electronics, robotics, hacking)
Mar 23
Marcelo Rodrigues replied to FiniousFingers's discussion New to group
"Hey man! A good point to start is reading basic tutorials on Arduino coding and wiring. Then, you…"
Mar 23
FiniousFingers posted a discussion

New to group

Couple quick things,I am just starting to learn, or wanting to learn, how to use the Arduino UNO…See More
Mar 23
Profile IconDan Urbauer, Bjorn and Jiaming Zhao joined GarageLab (arduino, electronics, robotics, hacking)
Mar 22
FiniousFingers is now a member of GarageLab (arduino, electronics, robotics, hacking)
Mar 20
Erva updated their profile
Mar 16
Erva and Mrs. Priscilla Bonneval are now friends
Mar 16
Profile IconSamantha Dorr, Lee Robinson and Celso Eiju Ito joined GarageLab (arduino, electronics, robotics, hacking)
Mar 16

© 2017   Created by Marcelo Rodrigues.   Powered by

Badges  |  Report an Issue  |  Terms of Service