DS1037 10 minutes late

hello !

i'm posting 2 reasons i2c ds1307 module :
 - take ds1307 example, transfered nano, , have problem it, hour displayed 10 minutes late... here's sketch :

code: [select]

// date , time functions using ds1307 rtc connected via i2c , wire lib
#include <wire.h>
#include "rtclib.h"

rtc_ds1307 rtc;

char daysoftheweek[7][12] = {"dimanche", "lundi", "mardi", "mercredi", "jeudi", "vendredi", "samedi"};

void setup () {
  while (!serial); // leonardo/micro/zero

  serial.begin(57600);
  if (! rtc.begin()) {
    serial.println("couldn't find rtc");
    while (1);
  }

  if (! rtc.isrunning()) {
    serial.println("rtc not running!");
    // following line sets rtc date & time sketch compiled
    rtc.adjust(datetime(f(__date__), f(__time__)));
    // line sets rtc explicit date & time, example set
    // january 21, 2014 @ 3am call:
    // rtc.adjust(datetime(2014, 1, 21, 3, 0, 0));
  }
}

void loop () {
    datetime = rtc.now();
   
    serial.print(now.year(), dec);
    serial.print('/');
    serial.print(now.month(), dec);
    serial.print('/');
    serial.print(now.day(), dec);
    serial.print(" (");
    serial.print(daysoftheweek[now.dayoftheweek()]);
    serial.print(") ");
    serial.print(now.hour(), dec);
    serial.print(':');
    serial.print(now.minute(), dec);
    serial.print(':');
    serial.print(now.second(), dec);
    serial.println();
   
    delay(3000);
}
and can see, "rtc.adjust(datetime(f(__date__), f(__time__)));" uncommented...
 - finally, default analog pins make rtc works, scl : a5; sda : a4. pins in use (in case) other module, there way change pins ?

thank !

you not explaining problem well, might because aren't setting time properly.
i use          http://bildr.org/2011/03/ds1307-arduino/
scl , sda i2c bus. several devices can share pins

Arduino Forum > Using Arduino > Networking, Protocols, and Devices (Moderator: fabioc84) > DS1037 10 minutes late

arduino