I think arduino didn't write time parameter to ds1307 !
Who would know? Your battery could be dead but I think the programme is junk. A comment lines says it updates the DS1307 each and every upload and, if that is the case, it seems you might as well look at your watch and use the millis counter.
Here is one to set the clock
//Arduino 1.0+ Only
//Arduino 1.0+ Only
// pre-set the time in the void then use reset button to set it!
#include "Wire.h"
#define DS1307_ADDRESS 0x68
byte zero = 0x00; //workaround for issue #527
void setup(){
Wire.begin();
Serial.begin(9600);
setDateTime(); //MUST CONFIGURE IN FUNCTION
}
void loop(){
printDate();
delay(1000);
}
void setDateTime(){
byte second = 0; //0-59
byte minute = 59; //0-59
byte hour = 11; //0-23
byte weekDay = 2; //1-7 1=Monday
byte monthDay = 9; //1-31
byte month = 4; //1-12
byte year = 13; //0-99
Wire.beginTransmission(DS1307_ADDRESS);
Wire.write(zero); //stop Oscillator
Wire.write(decToBcd(second));
Wire.write(decToBcd(minute));
Wire.write(decToBcd(hour));
Wire.write(decToBcd(weekDay));
Wire.write(decToBcd(monthDay));
Wire.write(decToBcd(month));
Wire.write(decToBcd(year));
Wire.write(zero); //start
Wire.endTransmission();
}
byte decToBcd(byte val){
// Convert normal decimal numbers to binary coded decimal
return ( (val/10*16) + (val%10) );
}
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);
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());
//print the date EG 3/1/11 23:59:59
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);
}
And here is a clock that works, use your own LCD pin setup
//Arduino 1.0+ Only
//Arduino 1.0+ Only
#include <LiquidCrystal.h>
#include "Wire.h"
#define DS1307_ADDRESS 0x68
LiquidCrystal lcd(8,9,16,5,6,7);
void setup(){
Wire.begin();
Serial.begin(9600);
lcd.begin(16, 2);
lcd.clear();
// Print a message to the LCD.
lcd.print("It is");
}
void loop(){
printDate();
delay(1000);
}
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());
lcd.setCursor(2, 1);
switch (weekDay) // Friendly printout the weekday
{
case 1:
lcd.print("MON ");
Serial.print("MON ");
break;
case 2:
lcd.print("TUE ");
Serial.print("TUE ");
break;
case 3:
lcd.print("WED ");
Serial.print("WED ");
break;
case 4:
lcd.print("THU ");
Serial.print("THU ");
break;
case 5:
lcd.print("FRI ");
Serial.print("FRI ");
break;
case 6:
lcd.print("SAT ");
Serial.print("SAT ");
break;
case 7:
lcd.print("SUN ");
Serial.print("SUN ");
break;
}
Serial.print(monthDay);
Serial.print("/");
Serial.print(month);
Serial.print("/");
Serial.print(year);
Serial.print(" ");
Serial.print(hour);
Serial.print(":");
Serial.print(minute);
Serial.print(":");
Serial.println(second);
lcd.setCursor(8,1);
lcd.print(monthDay);
lcd.print("/");
lcd.print(month);
lcd.print("/");
lcd.print(year);
lcd.setCursor(8,0);
lcd.print(hour);
lcd.print(":");
lcd.print(minute);
lcd.print(":");
lcd.print(second);
lcd.println(" ");
}
| Arduino Forum :: Using Arduino :: Networking, Protocols, and Devices :: Realtime clock running not correct