How to Sync PC time to DS1307

Using Arduino Programming Questions
1

Hello Guys.

I am trying to build an arduino program regarding on synchronizing my PC to Arduino and Store Time and Date Values to DS1307. This is my first medium level arduino programming.

So basically an arduino program that will READ PC TIME -> LOAD it to ARDUINO ATMEGA328 -> STORE time and date values to RTC (DS1307).

I am using this code but (a part from my code) , but then it didn't work.

if( getPCtime()) { // try to get time sync from pc
Serial.print("Clock synced at: ");
Serial.println(DateTime.now(),DEC);
}

Thank you guys for your help. I really appreciate any reply regarding on this matter.

2

DuingMeng:
I am using this code but (a part from my code)

Nowhere near enough information.

3

You will need to post all the code. Errors are often not where you think they are.

4

Thanks for looking at my problem. Here it is

#include <DS1307RTC.h>
#include <Time.h>
#include <Wire.h>

const char *monthName[12] = {
  "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};

tmElements_t tm;

void setup() {
  Serial.begin(9600); 
  bool parse=false;
  bool config=false;

  // get the date and time the compiler was run
  if (getDate(__DATE__) && getTime(__TIME__)) {
    parse = true;
    // and configure the RTC with this info
    if (RTC.write(tm)) {
      config = true;
     
     
     if( getPCtime()) {  // try to get time sync from pc
    Serial.print("Clock synced at: ");
    Serial.println(DateTime.now(),DEC);
  }

    }
  }

  Serial.begin(9600);
  
  while (!Serial) ; // wait for Arduino Serial Monitor
  delay(200);
  if (parse && config) {
    Serial.print("DS1307 configured Time=");
    Serial.print(__TIME__);
    Serial.print(", Date=");
    Serial.println(__DATE__);
  } else if (parse) {
    Serial.println("DS1307 Communication Error :-{");
    Serial.println("Please check your circuitry");
  } else {
    Serial.print("Could not parse info from the compiler, Time=\"");
    Serial.print(__TIME__);
    Serial.print("\", Date=\"");
    Serial.print(__DATE__);
    Serial.println("\"");
  }
}

void loop() {
  
  tmElements_t tm;

  if (RTC.read(tm)) {
    Serial.print("Ok, Time = ");
    print2digits(tm.Hour);
    Serial.write(':');
    print2digits(tm.Minute);
    Serial.write(':');
    print2digits(tm.Second);
    Serial.print(", Date (D/M/Y) = ");
    Serial.print(tm.Day);
    Serial.write('/');
    Serial.print(tm.Month);
    Serial.write('/');
    Serial.print(tmYearToCalendar(tm.Year));
    Serial.println();
  } else {
    if (RTC.chipPresent()) {
      Serial.println("The DS1307 is stopped.  Please run the SetTime");
      Serial.println("example to initialize the time and begin running.");
      Serial.println();
    } else {
      Serial.println("DS1307 read error!  Please check the circuitry.");
      Serial.println();
    }
    delay(9000);
  }
  delay(1000);
}

void print2digits(int number) {
  if (number >= 0 && number < 10) {
    Serial.write('0');
  }
  Serial.print(number);
}

bool getTime(const char *str)
{
  int Hour, Min, Sec;

  if (sscanf(str, "%d:%d:%d", &Hour, &Min, &Sec) != 3) return false;
  tm.Hour = Hour;
  tm.Minute = Min;
  tm.Second = Sec;
  return true;
}

bool getDate(const char *str)
{
  char Month[12];
  int Day, Year;
  uint8_t monthIndex;

  if (sscanf(str, "%s %d %d", Month, &Day, &Year) != 3) return false;
  for (monthIndex = 0; monthIndex < 12; monthIndex++) {
    if (strcmp(Month, monthName[monthIndex]) == 0) break;
  }
  if (monthIndex >= 12) return false;
  tm.Day = Day;
  tm.Month = monthIndex + 1;
  tm.Year = CalendarYrToTm(Year);
  return true;
}

Moderator edit:
</mark> <mark>[code]</mark> <mark>

</mark> <mark>[/code]</mark> <mark>
tags added.

5 
  if (getDate(__DATE__) && getTime(__TIME__)) {
    parse = true;
    // and configure the RTC with this info
    if (RTC.write(tm)) {
      config = true;

This will always reset the date/time to that when the program was compiled. This is probably not what you want every time the Arduino is reset.

   if( getPCtime()) {  // try to get time sync from pc

Where is this function?

6

DuingMeng:
it didn't work.

What did you expect it to do?

What did it actually do?

If you want help with your code, you need to post the complete code.

7

DuingMeng:
I am trying to build an arduino program regarding on synchronizing my PC to Arduino and Store Time and Date Values to DS1307.

You must write TWO programs, one running in the PC environment then second running inside Arduino. Both programs must communicate (PC -> sends timestamp via serial line -> Arduino reads value from serial line)

The second way is to use the Ethernet Shield, get time from NTP server and update RTC chip, this may be more "permanently" solution.