Real Time Clock DS1307 - Arquivo 005

Referência:
Exemplos da biblioteca DS1307.h

Lista de Materiais:
IDE Arduino 1.0.6
1x  Board Arduino UNO
1x  Protoboard 830 furos
1x  Cabo USB-A male to USB-B male 
1x  Conj. de fios jumper p/ protoboard
1x  Módulo RTC DS1307
1x  Bateria Maxell CR2032 3V

Montagem:

Firmware:
#include <Wire.h>
#include <DS1307.h>

char dateTime[22];
int RTCValues[7], i = 0, year, month, dayOfMonth, dayOfWeek, hour, minute,
    second;
//*******************************************************************************
void setup() {
    Serial.begin(9600);
    Serial.println("Favor entrar com data e hora no formato \"DD-MM-YYYY HH:MM:SS D\",");
    Serial.println("Onde D e o numero do dia da semana (0 = Domingo, 6 = Sabado).");
    Serial.println("Examplo: 11-04-2003 02:25:27 6");
    DS1307.begin();

    while (i < 21) {
        if (Serial.available()) {
            char c = Serial.read();
            dateTime[i] = c;
            i++;
        }
    }
    dateTime[i] = '\0';
    
    dayOfMonth = 10 * (dateTime[0] - 48) + (dateTime[1] - 48);
    month = 10 * (dateTime[3] - 48) + (dateTime[4] - 48);
    year = 10 * (dateTime[8] - 48) + (dateTime[9] - 48);
    dayOfWeek = (dateTime[20] - 48);
    hour = 10 * (dateTime[11] - 48) + (dateTime[12] - 48);
    minute = 10 * (dateTime[14] - 48) + (dateTime[15] - 48);
    second = 10 * (dateTime[17] - 48) + (dateTime[18] - 48);

    DS1307.setDate(year, month, dayOfMonth, dayOfWeek, hour, minute, second);
    Serial.println("Data e hora configurados!");
    Serial.println("Lendo dados do RTC...");
}
//*******************************************************************************
void loop() {
    DS1307.getDate(RTCValues);
    sprintf(dateTime, "%02d-%02d-20%02d %02d:%02d:%02d", RTCValues[2],
            RTCValues[1], RTCValues[0], RTCValues[4], RTCValues[5],
            RTCValues[6]);
    Serial.print(dateTime);
    Serial.print(" - Dia da semana: ");
    Serial.println(fromNumberToWeekDay(RTCValues[3]));

    delay(1000);
}
//*******************************************************************************
char fromNumberToWeekDay(int week){
  switch (week){
    case 0:
      Serial.print("Dom.");
      break;
    case 1:
      Serial.print("Seg.");
      break;
    case 2:
      Serial.print("Ter.");
      break;
    case 3:
      Serial.print("Qua.");
      break;
    case 4:
      Serial.print("Qui.");
      break;
    case 5:
      Serial.print("Sex.");
      break;
    case 6:
      Serial.print("Sab.");
      break;
  }
}

Download: DS1307.h