ARDUINO RTC PROGRAM

Projects Programming
1

THE COMPONENT REQUIRED : ARDUINO UNO/ ARDUINO DEUMILANOVE
RTC REQUIRED:SparkFun Real Time Clock Module - BOB-12708 - SparkFun Electronics OR ANY WITH 12C INTERFACE
PIN CONNECTION :Real Time Clock DS1307 (RTC) + Arduino
simple code write date/ time in to RTC . It worked for me .i can also able to syn gps time date. :smiley: :slight_smile:

//Arduino 1.0+ Only
//Arduino 1.0+ Only

#include "Wire.h"
#define DS1307_ADDRESS 0x68

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

void loop(){
  printDate();
  delay(100);
}

byte bcdToDec(byte val)  {
// Convert binary coded decimal to normal decimal numbers
  return ( (val/16*10) + (val%16) );
}

void printDate(){

  // Reset the register pointer
  Wire.beginTransmission(DS1307_ADDRESS);

  byte zero = 0x00;
  Wire.write(zero);
  Wire.endTransmission();

  Wire.requestFrom(DS1307_ADDRESS, 7);

  int second = bcdToDec(Wire.read());
  int minute = bcdToDec(Wire.read());
  int hour = bcdToDec(Wire.read() & 0b111111); //24 hour time
  int weekDay = bcdToDec(Wire.read()); //0-6 -> sunday - Saturday
  int monthDay = bcdToDec(Wire.read());
  int month = bcdToDec(Wire.read());
  int year = bcdToDec(Wire.read());


// this code wil write user define time, date . whenever CPU reset the RTC read data from default. If we syn with gps it read data from GPS.
  /*int second = 12;
  int minute = 30;
  int hour = 21;
  int weekDay = bcdToDec(Wire.read()); //0-6 -> sunday - Saturday
  int monthDay =2;
  int month =11;
  int year = 12;
*/
  
  Serial.print(month);
  Serial.print("/");
  Serial.print(monthDay);
  Serial.print("/");
  Serial.print(year);
  Serial.print(" ");
  Serial.print(hour);
  Serial.print(":");
  Serial.print(minute);
  Serial.print(":");
  Serial.println(second);

}
2

That's cool, I guess.

3

AJITnayak:
simple code write date/ time in to RTC . It worked for me .i can also able to syn gps time date. :smiley: :slight_smile:

I'm sorry, I don't understand the question.

4

Cool piece of Code but I see no GPS Libs... or for that matter code to use them or is that why you posted it... For suggestions?

Bob

5

can some one share me the code for syn gps to RTC time.
problems:
1)How to check i have written RTC time properly or not??
2) when ever i write code for RTC when try to open serial monitor i will found the date and time what have set it for.
why cant it update the RTC time to last stored

syntax program:
get_time(); get present time from rtc
get_previous_time();store present value in variable called previous
set_time();write previous time to RTC

print_time();Print the set time