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: 28714

Tags: arduino, sd, tutorial

Comment

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

Join GarageLab (arduino, electronics, robotics, hacking)

Latest Activity

Gilmar Barbosa replied to GarageLab's discussion Show your lab!
4 hours ago
Gilmar Barbosa is now a member of GarageLab (arduino, electronics, robotics, hacking)
5 hours ago
GarageLab posted blog posts
7 hours ago
Profile IconMichael Tria, Carl C Sartin and Oswaldo Machado joined GarageLab (arduino, electronics, robotics, hacking)
yesterday
GarageLab posted a blog post

Pressure Gauge Modded to Measure Internet Usage

The appeal of having a 100 year old gauge on the wall that shows the current Internet usage is hard…See More
Monday
GarageLab posted blog posts
Friday
Profile IconAngelo Zanellato and Allan Byres joined GarageLab (arduino, electronics, robotics, hacking)
Aug 21
Shannon Bradley commented on GarageLab's blog post Company creates device that recharges smartphones ultrasound
" I have been having good results out too ten to twenty miles. I'm about to fix this…"
Aug 21
GarageLab posted blog posts
Aug 21
Marcelo Rodrigues commented on Marcelo Rodrigues's blog post Arduino generated VGA (color) signal - Complete!
"Jay, Here it is. Enjoy! "
Aug 20
Jay Curtis commented on Marcelo Rodrigues's blog post Arduino generated VGA (color) signal - Complete!
"Hey, great stuff! Found this site through searching for a solution to get VGA to work with LCD and…"
Aug 20
GarageLab posted a blog post

Omote uses light to project virtual makeup and real-time animations on your face

A team of artists and computer graphics designers have created a projection mapping system that you…See More
Aug 19
Profile Iconvivi and Jay Curtis joined GarageLab (arduino, electronics, robotics, hacking)
Aug 19
GarageLab posted blog posts
Aug 18
GarageLab posted blog posts
Aug 14
Tony Warren posted a photo
Aug 13
Dmitriy Zelinskiy joined Marcelo Rodrigues's group
Thumbnail

Arduino

Group for the Arduino communitySee More
Aug 12
Profile IconMike Hutchings, Dmitriy Zelinskiy and blake tony joined GarageLab (arduino, electronics, robotics, hacking)
Aug 12
GarageLab posted blog posts
Aug 12
Siti Normah is now a member of GarageLab (arduino, electronics, robotics, hacking)
Aug 11

© 2014   Created by Marcelo Rodrigues.

Badges  |  Report an Issue  |  Terms of Service