RTC DS1307 Shield V3.0

RTC DS1307 Clock can be used to have an independent Clock to feed arduino with time.

DS1307 is a real-time chip of DALLAS company,which adopt I2C protocal to communicate with SCM, and there was this kind interface on Arduino, therefore is very convenient to link with each other. DS1307 have a programmable waveforms output, it can be used to drive LED lights, or trigger a certain event as a break off, but be careful when you use it to take some kind of high power module. We design the real clock module to pin out the I2C interface of Ds1307 and programmable waveforms output interface SQW are connected, but usually we will only use the I2C interface to realize basic set the clock/read function. Note, this module must be installed on the battery can work normally. The battery is button batteries (type CR1220), the positive upward.

You can connect it to arduino using the Arduino Sensor Shield not included.

Download the DS1307 Library 1 or Library 2
then uncompress DS1307 Library 1 or Library 2 into libraries of Arduino and restart ;

Testing Code :

#include <WProgram.h>
#include <Wire.h>
#include <DS1307.h> // written by mattt on the Arduino forum and modified by D. Sjunnesson

void setup()
{
  Serial.begin(9600);

  RTC.stop();
  RTC.set(DS1307_SEC,1);        //set the seconds
  RTC.set(DS1307_MIN,23);     //set the minutes
  RTC.set(DS1307_HR,12);       //set the hours
  RTC.set(DS1307_DOW,4);       //set the day of the week
  RTC.set(DS1307_DATE,15);       //set the date
  RTC.set(DS1307_MTH,7);        //set the month
  RTC.set(DS1307_YR,10);         //set the year
  RTC.start();

}

void loop()
{

  Serial.print(RTC.get(DS1307_HR,true));  //read the hour and also update all the values( true)
  Serial.print(":");
  Serial.print(RTC.get(DS1307_MIN,false));//read minutes without update (false)
  Serial.print(":");
  Serial.print(RTC.get(DS1307_SEC,false));//read seconds
  Serial.print(" ");                 // some space for a more happy life
  Serial.print(RTC.get(DS1307_DATE,false));//read date
  Serial.print("/");
  Serial.print(RTC.get(DS1307_MTH,false));//read month
  Serial.print("/");
  Serial.print(RTC.get(DS1307_YR,false)); //read year 
 Serial.println();

  delay(1000);
}