DS2331 Real Time Clock

I²C-Integrated RTC/TCXO/Crystal

Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year, with Leap-Year Compensation Valid Up to 2100
Accuracy ±2ppm from 0°C to +40°C
Accuracy ±3.5ppm from -40°C to +85°C
Digital Temp Sensor Output: ±3°C Accuracy
Register for Aging Trim
Active-Low RST Output/Pushbutton Reset Debounce Input
Two Time-of-Day Alarms
Programmable Square-Wave Output Signal
Simple Serial Interface Connects to Most Microcontrollers
- Fast (400kHz) I²C Interface
Battery-Backup Input for Continuous Timekeeping
- Low Power Operation Extends Battery-Backup Run Time

//DS2331 Real Time Clock
#include "RTClib.h" //https://github.com/adafruit/RTClib
//MEGA2560 SDA/SCL ->20 & 21
RTC_DS3231 rtc;
Void setup()
{
Serial.begin(9600);
    	if (! rtc.begin()) 
{
      		Serial.println("Couldn't find RTC");
}
else  
{
      	Serial.println("Fond RTC");
      	if (rtc.lostPower()) {
Serial.println("RTC lost power, lets set the time!");
       	 // following line sets the RTC to the date & time this sketch was compiled
rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
 	// This line sets the RTC with an explicit date & time, for example to set
        	// January 21, 2014 at 3am you would call:
        	// rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
  }
}
Void loop()
{

      	DateTime now = get_Time();
      	sprintf(char_buffer,"%d/%d/%d",now.year(),now.month(),now.day());
Serial.println(char_buffer);
      	sprintf(char_buffer,"%d:%d:%d",now.hour(),now.minute(),now.second());
      	Serial.println(char_buffer);	
Delay (1000);
}