DS3231 RTC Module

				
					// by lingshunlab.com

// Load the library of DS3231
#include "RTClib.h"

// create rtc instance
RTC_DS3231 rtc;

String input_string; // Declare the variable input_string to store the data input by the serial port

// Declare a two-dimensional array variable daysOfTheWeek, which is used to match the corresponding week name through the index (index) of the array
char daysOfTheWeek[7][12] = {"Sunday",
                              "Monday",
                              "Tuesday",
                              "Wednesday",
                              "Thursday",
                              "Friday",
                              "Saturday"};

// get serial port data function
void GetSerialStuff(String& input_string) {
   String temp_string = ""; // Declare the variable temp_string to temporarily store the data input by the serial port
   while(Serial.available()) { // When the serial port has data, loop execution
     temp_string += (char)Serial.read(); // Combine the read serial data into the inStr variable one by one
     delay(2);
   }
   input_string = temp_string; // Assign the reference pointer variable to tempStr
}

void setup() {
   Serial.begin(9600);

   // Initialize rtc,
   if (! rtc.begin()) { // If initialization fails, then
     Serial.println("Couldn't find RTC");
     Serial. flush();
     abort(); // program stops
   }
}

void loop() {

   GetSerialStuff(input_string); // Get the data of the serial port
   if(input_string != "") { // If the serial port is not empty, then
     int to_year = input_string.substring(0, 4).toInt(); // Intercept year data from string and convert to int data type
     int to_month = input_string.substring(5, 7).toInt(); // Intercept the month data from the string and convert it to int data type
     int to_day = input_string.substring(8, 10).toInt(); // Intercept the day data from the string and convert it to int data type
     int to_hours = input_string.substring(11, 13).toInt(); // Intercept the hour data from the string and convert it to int data type
     int to_minute = input_string.substring(14, 16).toInt(); // Intercept minute data from the string and convert it to int data type
     int to_second = input_string.substring(17, 19).toInt(); // Intercept the second data from the string and convert it to int data type

     // Reset the time of the DS3231 module
     rtc.adjust(DateTime(to_year, to_month, to_day, to_hours, to_minute, to_second));
     delay(100);
   }

   // Get the time of DS3231
   DateTime now = rtc.now();

   // Display the current time of DS3231 through the serial port output
   Serial.print(now.year(), DEC); // display the year in decimal
   Serial. print('/');
   Serial.print(now.month(), DEC);// Display the month in decimal
   Serial. print('/');
   Serial.print(now.day(), DEC);// Display the day in decimal
   Serial. print(" (");
   Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
   Serial. print(") ");
   Serial.print(now.hour(), DEC);// display in decimal
   Serial. print(':');
   Serial.print(now.minute(), DEC);// Display minutes in decimal
   Serial. print(':');
   Serial.print(now.second(), DEC);// Display seconds in decimal
   Serial. println();

   // Display the temperature sensor data of DS3231 through the serial port output
   Serial. print("Temperature: ");
   Serial.print(rtc.getTemperature());
   Serial. println("C");

   delay(1000);
}