DS3231 Read Time Error

Projects Programming
3

Try the following sketch:

#include "RTClib.h" //for DS3231 RTC contains Wire.h
byte prSec = 0;

RTC_DS3231 rtc; //user data type RTC_DS3231    variable rtc or object
DateTime nowDT;
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

void setup ()
{
  Serial.begin(9600);
  rtc.begin();
  //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));//takes time of the day from PC
  rtc.adjust(DateTime(2021, 12, 31, 01, 59, 57));//set date-time manualy:yr,mo,dy,hr,mn,sec
}

void loop ()
{
  showTime();
  timeDelay();//1-sec interval of time display; it comes from DS3231 itself
}
//===================================================

void showTime()
{
  nowDT = rtc.now();  //nowDT hold Date and Time
  //---------------------------
  byte myHour = nowDT.hour();   //myHour holds Hour of time of daya
  if (myHour < 10)
  {
    Serial.print('0');
  }
  Serial.print(myHour); Serial.print(':'); //12:58:57     12:4:56
  //-------------------------------------------------
  byte myMin = nowDT.minute(); //to show leading zero of minute
  if (myMin < 10)
  {
    Serial.print('0');
  }
  Serial.print(nowDT.minute()); Serial.print(':');
  //--------------------------------------------------
  byte mySec = nowDT.second();
  if (mySec < 10)
  {
    Serial.print('0');
  }
  Serial.print(mySec);//(nowDT.second(), DEC);
  //----------------------------------------- `
  Serial.print("  ");
  Serial.print(daysOfTheWeek[nowDT.dayOfTheWeek()]); Serial.print(' ');
  byte myDay = nowDT.day();
  if (myDay < 10)
  {
    Serial.print('0');
  }
  Serial.print(myDay); Serial.print(':');
  //-----------------------------------------------------
  byte myMonth = nowDT.month();
  if (myMonth < 10)
  {
    Serial.print('0');
  }
  Serial.print(nowDT. month()); Serial.print(':');
  Serial.println(nowDT.year());
}
//---------------------------------------------
void timeDelay()
{
  prSec = bcdSecond();   //current second of RTC
  while (bcdSecond() == prSec) // != 1 )
  {
    ;
  }
  prSec = bcdSecond(); //delay(1000);
}

byte bcdSecond()
{
  nowDT = rtc.now();
  if (nowDT.second() == 0 )
  {
    return 0;
  }
  else
  {
    return nowDT.second();
  }
}