Hello,
I'm new to the world of arduino, sorta. I have two Arduinos, an Uno REV2, and the Mega REV3. I bought the Mega thinking I would be able to carry my SD Card Shield (Seeedstudio 3.0 I believe) to work on my new Mega. Once I got home, I thought, okay, I'll align the pins accordingly, did that, got a "initialization failed!" from the ReadWrite example for SD Cards (It works on my Uno just fine). I then read that I have to attatch pins 11,12,13 to Mega's 50,51,52, did that, and then attatch the SS pin, which on the Uno is pin 10, to the Mega's pin 53. Did that, and I still get an "initialization failed!". I connected the 4 pins (11-50,12-51,13-52 and 10-53) via standard jumpers. My setup:
SD Card Shield is attached to Uno.
Connected the pins as this page says (http://arduino.cc/de/Reference/SD)
Pins were: 11-50,12-51,13-52 and 10-53
Once the Arduino Uno was plugged in and powering, aswell as the Mega, and opened the ReadWrite and launched the program, making sure the "Mega 2560 or Mega ADK" board was selected, and the serial port was correct (For me, COM4).
CODE:
/*
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
modified 9 Apr 2012
by Tom Igoe
This example code is in the public domain.
*/
#include <SD.h>
File myFile;
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("Initializing 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(53, OUTPUT);
if (!SD.begin(53)) {
Serial.println("initialization failed!");
return;
}
Serial.println("initialization done.");
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
myFile = SD.open("test.txt", FILE_WRITE);
// if the file opened okay, write to it:
if (myFile) {
Serial.print("Writing to test.txt...");
myFile.println("testing 1, 2, 3.");
// close the file:
myFile.close();
Serial.println("done.");
} else {
// if the file didn't open, print an error:
Serial.println("error opening test.txt");
}
// re-open the file for reading:
myFile = SD.open("test.txt");
if (myFile) {
Serial.println("test.txt:");
// read from the file until there's nothing else in it:
while (myFile.available()) {
Serial.write(myFile.read());
}
// close the file:
myFile.close();
} else {
// if the file didn't open, print an error:
Serial.println("error opening test.txt");
}
}
void loop()
{
// nothing happens after setup
}
I still received the "initialization has failed!" error in the Serial Monitor. Ideas?
Thank you.