Prog dois

#include <Wire.h>
#include "RTClib.h"

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

RTC_DS1307 rtc;

char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

const int chipSelect = 4;
int sensor1=30, sensor2=25, sensor3=90;

int ano,dia,mes,hora,minuto,segundo;
char sem;

File dataFile;

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

//********************** Iniciando o RTC ***************************************
  if (! rtc.begin())
  {
    Serial.println("RTC Não Encontrado");
    while (1);
  }

  if (! rtc.isrunning())
  {
    Serial.println("RTC is NOT running!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    rtc.adjust(DateTime(2015, 1, 21, 3, 0, 0));
  }

  delay(500);
//********************** Inicando o SD ***************************************

 Serial.print("Initializing SD card...");
  // make sure that the default chip select pin is set to
  // output, even if you don't use it:
  pinMode(SS, OUTPUT);

  // 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("card initialized.");

//********************** Cria o Arquivo no SD ***************************************
  // Open up the file we're going to log to!
  dataFile = SD.open("teste.txt", FILE_WRITE);
  if (! dataFile) {
    Serial.println("error opening datalog.txt");
    // Wait forever since we cant write data
    while (1) ;
  }

}

void loop()
{
    DateTime now = rtc.now();

    ano=now.year();
    mes=now.month();
    dia=now.day();
    hora=now.hour();
    minuto=now.minute();
    segundo=now.second();

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


    dataFile.print(String(dia));
    dataFile.print('/');
    dataFile.print(String(mes));
    dataFile.print('/');
    dataFile.print(String(ano));
    dataFile.print(" (");
    dataFile.print(daysOfTheWeek[now.dayOfTheWeek()]);
    dataFile.print(") ");
    dataFile.print(String(hora));
    dataFile.print(':');
    dataFile.print(String(minuto));
    dataFile.print(':');
    dataFile.print(String(segundo));
    dataFile.print('|');
    dataFile.print(String(sensor1));
    dataFile.print('|');
    dataFile.print(String(sensor2));
    dataFile.print('|');
    dataFile.print(String(sensor3));
    dataFile.println();
    Serial.print(hora);
    Serial.print(':');
    Serial.print(minuto);
    Serial.print(':');
    Serial.print(segundo);
    Serial.print(':');
    Serial.println("Salvo");
    dataFile.close();
    delay(1000);

}