SD Card Shield DFR0165 - Arquivo 017

Referência:
http://www.dfrobot.com/wiki/index.php/Mega_IO_Expansion_Shield_V2.3_(SKU:DFR0165)

Lista de Materiais:
IDE Arduino 1.0.6
1x  Board Arduino MEGA 2560
1x  Cabo USB-A male to USB-B male 
1x  Mega IO Expansion Shield V.2.3
1x  Mini SD Card

Montagem:

Firmware:
#include <SPI.h>
#include <SD.h>

const int chipSelect = 4;

void setup(){
  Serial.begin(9600);
  while (!Serial) {
    ;
  }


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

  if (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
    return;
  }
  Serial.println("card initialized.");
}

void loop(){
  String dataString = "";

  for (int analogPin = 0; analogPin < 3; analogPin++) {
    int sensor = analogRead(analogPin);
    dataString += String(sensor);
    if (analogPin < 2) {
      dataString += ",";
    }
  }

  File dataFile = SD.open("datalog.txt", FILE_WRITE);

  if (dataFile) {
    dataFile.println(dataString);
    dataFile.close();
    Serial.println(dataString);
  }
  else {
    Serial.println("error opening datalog.txt");
  }
}

Download: não necessário