Setting Time and Date for the DS3231 RTC

Setting up the DS3231 RTC

 DS3231 RTC Datasheet: https://datasheets.maximintegrated.com/en/ds/DS3231.pdf
 Insert a coin cell battery into DS3231. 
 Either a CR2032 or LI2032 coin cell battery will work.
 Insert DS3231 module into the Power Logger PCB at J5. 

To Set the date and time use the follow program and paste in the Arduino IDE.
Ensure sure you have added these two libraries: Wire.h and ds3231.h to the Arduino environment using the library manager.

 //This code can be found here:https://github.com/rodan/ds3231
 #include <Wire.h>    //Make sure you have added this library to the Arduino environment
 #include <ds3231.h>  //Make sure you have added this library to the Arduino environment
 struct ts t; 
 void setup() {
 Serial.begin(9600);
 Wire.begin();
 DS3231_init(DS3231_CONTROL_INTCN);
 /*----------------------------------------------------------------------------
 In order to synchronize your clock module, insert timetable values below !
 ----------------------------------------------------------------------------*/
 t.hour=20;      //Set the hour in military time to your current time. 
 t.min=40;       //Set the minutes. 
 t.sec=0;        //No need to change   
 t.mday=11;      //Set the Day
 t.mon=4;        //Set the Month
 t.year=2021;    //Set the Year
 DS3231_set(t);  //Comment this line out after setting RTC with time & date to validate
 }

 void loop() {
 DS3231_get(&t);
 Serial.print("Date : ");
 Serial.print(t.mon);
 Serial.print("/");
 Serial.print(t.mday);
 Serial.print("/");
 Serial.print(t.year);
 Serial.print("\t Hour : ");
 Serial.print(t.hour);
 Serial.print(":");
 Serial.println(t.min);
 Serial.print(":");
 Serial.println(t.sec);
 delay(60000);
 }
 void print2digits(int number){
 if (number >= 0 && number < 10) {
   Serial.write ('0');
 }
 Serial.print(number);
 } 

Connect the USBTinyISP to the AVR-ISP-6 pin header J7 on the Power Fail Logger PCB .
In the Arduino IDE click on Tools Tab - Select Programmer then select USBTinyISP.
In the Arduino IDE click on Sketch Tab - Select Upload Using Programmer
Program should download.