FALTA RTC

#include <SPI.h>
#include <SD.h>
#include <Wire.h>
#include <RTClib.h>
#include <dht.h>
#include <OneWire.h>
#include <DallasTemperature.h>

#define ONE_WIRE_BUS 10
#define dht_dpin A1 //Pino DATA do Sensor ligado na porta Analogica A1


RTC_DS1307 RTC;
dht DHT; //Inicializa o sensor
const int chipSelect = 53;
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
DeviceAddress vermelho_1_Thermometer = { 0x28, 0xFF, 0xB8, 0x67, 0x56, 0x14, 0x03, 0xB0 };
DeviceAddress azul_1_Thermometer = { 0x28, 0xFF, 0x5B, 0x45, 0x64, 0x14, 0x04, 0x41 };


float tempC;                          // modifiquei aqui
float tempA;                          // modifiquei aqui
float tempV;                          // modifiquei aqui


void setup(void)
{
  Serial.begin(9600);
  Wire.begin();//Inicializacao do protocolo wire
  RTC.begin();//Inicializacao do modulo RTC
  DateTime now;
  delay (1000);
  //Verifica se o modulo esta funcionando ou nao
  if (!RTC.isrunning()) {
    Serial.println("RTC is NOT running!");
    //Ajusta a data/hora do Clock com a data/hora em que o codigo foi compilado, basta descomentar a linha
    //RTC.adjust(DateTime(2015,6,9,17,9,40));
  }

    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:
    return;
  }


  sensors.begin();
  sensors.setResolution(vermelho_1_Thermometer, 10);
  sensors.setResolution(azul_1_Thermometer, 10);
}

void printTemperature(DeviceAddress deviceAddress)
{
//  float tempC = sensors.getTempC(deviceAddress);       // modifiquei aqui
   tempC = sensors.getTempC(deviceAddress);              // modifiquei aqui
  if (tempC == -127.00)
  {
    Serial.print("Erro ao ler temperatura !");
  }
  else
  {
    Serial.print(" C: ");
    Serial.print(tempC);
    Serial.print(" F: ");
    Serial.print(DallasTemperature::toFahrenheit(tempC));
  }
}

void loop(void)
{

   // make a string for assembling the data to log:
  String dataString = "";

  // read one sensor and append to the string:
  for (int analogPin = 0; analogPin < 3; analogPin++) {
    int sensor = analogRead(analogPin);
    dataString += String(sensor);
    if (analogPin < 2) {
      dataString += ",";
    }
  }

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

  // if the file is available, write to it:
  if (dataFile) {

    dataFile.println();

    dataFile.println("Temperature,Umidade");

    dataFile.println(DHT.temperature);

    dataFile.println(DHT.humidity);

    dataFile.println("TemperatureSensor1, TemperatureSensor2");

    dataFile.println(tempV);

    dataFile.println(tempA);

    dataFile.close();
    // print to the serial port too:
    Serial.println();
  }
  // if the file isn't open, pop up an error:
  else {
    Serial.println("error opening datalog.csv");
  }



  {
   DateTime now = RTC.now();//Recuperando a data e hora atual
   Serial.print(now.day(), DEC);//Imprimindo o dia
   Serial.print('/');
   Serial.print(now.month(), DEC);//Recuperando o mes
   Serial.print('/');
   Serial.print(now.year(), DEC);//Recuperando o ano
   Serial.print(' ');
   Serial.print(now.hour(), DEC);//Recuperando a hora
   Serial.print(':');
   Serial.print(now.minute(), DEC);//Recuperando os minutos
   Serial.print(':');
   Serial.print(now.second(), DEC);//Recuperando os segundos
   Serial.println();



  DHT.read11(dht_dpin); //Lê as informações do sensor
  Serial.print("SENSOR DHT11:\n\r");
  Serial.print("Umidade = ");
  Serial.print(DHT.humidity);
  Serial.print(" %  ");
  Serial.print("Temperatura = ");
  Serial.print(DHT.temperature);
  Serial.println(" Celsius  ");

  {
  delay(3000);
  Serial.print("SENSOR DS18B20:\n\r");
  sensors.requestTemperatures();
  Serial.print("Temperatura Sensor 1: ");
  printTemperature(vermelho_1_Thermometer);
  tempV = tempC;                                  // modifiquei aqui
  Serial.print("\n\r");
  Serial.print("Temperatura Sensor 2: ");
  printTemperature(azul_1_Thermometer);
  tempA = tempC;                                  // modifiquei aqui
  Serial.print("\n\r");

  delay(1000);//Aguarda 1 seg antes de acessar as informações do sensor
}


  //Não diminuir o valor abaixo. O ideal é a leitura a cada 2 segundos
  delay(4000);
 }
}