Portable EEG w/ SD Card Logging

// Arduino Brain Library - Brain Serial Test

// Description: Grabs brain data from the serial RX pin and sends CSV out over the TX pin (Half duplex.)
// More info: https://github.com/kitschpatrol/Arduino-Brain-Library
// Author: Eric Mika, 2010 revised in 2014, Adapted for local SD Card Logging by Victor Frost
const int chipSelect = 10;
#include <Brain.h>
#include <SdFat.h>
SdFat sd;
SdFile myFile;
// Set up the brain parser, pass it the hardware serial object you want to listen on.
Brain brain(Serial);
void logEvent(const char *msg) {
  // create or open a file for append
  ofstream sdlog("LOGFILE.CSV", ios::out | ios::app);

  // append a line to the file
  sdlog << msg << endl;

  // check for errors
  if (!sdlog) sd.errorHalt("append failed");

  sdlog.close();
}
void setup() {
  pinMode(A0, OUTPUT);
  digitalWrite(A0, HIGH);
    // Start the hardware serial and get the SD Card ready.
    Serial.begin(9600);
      while (!Serial) {}  // wait for Leonardo
    Serial.println("Starting Up");
     if (!sd.begin(chipSelect, SPI_HALF_SPEED)) sd.initErrorHalt();
     Serial.print("Logging Brain Activity");
}

void loop() {
    // Expect packets about once per second.
    // The .readCSV() function returns a string (well, char*) listing the most recent brain data, in the following format:
    // "signal strength, attention, meditation, delta, theta, low alpha, high alpha, low beta, high beta, low gamma, high gamma"
    // Also, log the data to the SDcard, since it's there.
    if (brain.update()) {
        Serial.println(brain.readErrors());
        Serial.println(brain.readCSV());
        logEvent(brain.readCSV());
    }
}