I can't print the current day week.

Projects Programming
1

Hello, please help me to understand, why my prog printing the day of the week all the time - "zero" . the global time and the month day is correct

The code is :

#include "Wire.h"
#include "RTClib.h"
#define DS1307_ADDRESS 0x68
RTC_DS1307 RTC; // import the I2C library and set the bus address of the RTC in the sketch as 0x68.
byte zero = 0x00; //workaround for issue #527
DateTime currentDateTime;
byte timeBuffer[8];

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());

void setup(){
Wire.begin();
Serial.begin(9600);
setDateTime(); /not be highlighted while reading the time, Here it will setdate/
Wire.begin(); // Initiate the Wire library and join the I2C bus as a master or slave. This should normally be called only once.
RTC.begin();
RTC.adjust(DateTime(DATE, TIME)); // is take the Date and Time according the computer you're using
}

void loop(){
printDate();
delay(1000);
}

void setDateTime()
{

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());

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.print(second);
Serial.print(":");
Serial.println(weekDay); //today

}

2

day of week number is 1..7, not 0..6

3 
#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 =      45; //0-59
  byte minute =49; //0-59
  byte hour = 10; //0-23
  byte weekDay =2; //1-7
  byte monthDay =23; //1-31
  byte month = 1; //1-12
  byte year  =       14; //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());

 /*  int second = 11;
  int minute =18;
  int hour = 18;
  int weekDay = 1;
  int monthDay = 2;
  int month = 11;
  int year = 12;
*/
  //print the date EG   3/1/11 23:59:59
  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);
  
  Serial.print("Week Day Of week");
  Serial.println(weekDay);
  

}

Here you can set weekday As to u entered. Once it started working automatically update