Accelerometer & SD card proptotype

arduino_prototype.ino

#include <SD.h>
#include <Lucky.h> 

const int chipSelect = 4;

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

  // Start the accelerometer board
  Serial.println("Initalize Lucky Board ... ");
  lucky.begin();
  Serial.println("Initalize Lucky Board... Done");
  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:
    while (1);
  }
  Serial.println(" Done");
}

void loop() {
  String dataString = "";
  
  //read accelerometer sensor
  lucky.accelerometer().read();
  dataString += String(lucky.accelerometer().x());
  dataString += ",";
  dataString += String(lucky.accelerometer().y());
  dataString += ",";
  dataString += String(lucky.accelerometer().z());

  // 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("data.csv", FILE_WRITE);

  // // if the file is available, write to it:
  if (dataFile) {
    dataFile.println(dataString);
    dataFile.close();
    // print to the serial port too:
    Serial.println(dataString);
  } else {
    Serial.println("cannot open file");
  }

  // Serial.println(dataString);
  // delay before next reading:
  delay(1000);
}