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This tutorial will show how to get real time clock from RTC module DS3231, also set time for it.
Fortunately, we can also get temperature from this module. What a lucky!

Real time clock is essential part for some application such as data acquisition.
DS3231 uses I2C communication, so the connection circuit with Arduino Pro Mini looks very simple

Before using code with DS3231, the library for it needed to be installed



Code works
#include <Wire.h>
#include "DS3231.h"

RTClib RTC;
DS3231 Clock;

byte Year;
byte Month;
byte Date;
byte DoW;
byte Hour;
byte Minute;
byte Second;
int tempC;

void GetDateStuff(byte& Year, byte& Month, byte& Day, byte& DoW, 
    byte& Hour, byte& Minute, byte& Second) {
  // Call this if you notice something coming in on 
  // the serial port. The stuff coming in should be in 
  // the order YYMMDDwHHMMSS, with an 'x' at the end.
  boolean GotString = false;
  char InChar;
  byte Temp1, Temp2;
  char InString[20];

  byte j=0;
  while (!GotString) {
    if (Serial.available()) {
      InChar = Serial.read();
      InString[j] = InChar;
      j += 1;
      if (InChar == 'x') {
        GotString = true;
      }
    }
  }
  Serial.println(InString);
  // Read Year first
  Temp1 = (byte)InString[0] -48;
  Temp2 = (byte)InString[1] -48;
  Year = Temp1*10 + Temp2;
  // now month
  Temp1 = (byte)InString[2] -48;
  Temp2 = (byte)InString[3] -48;
  Month = Temp1*10 + Temp2;
  // now date
  Temp1 = (byte)InString[4] -48;
  Temp2 = (byte)InString[5] -48;
  Day = Temp1*10 + Temp2;
  // now Day of Week
  DoW = (byte)InString[6] - 48;   
  // now Hour
  Temp1 = (byte)InString[7] -48;
  Temp2 = (byte)InString[8] -48;
  Hour = Temp1*10 + Temp2;
  // now Minute
  Temp1 = (byte)InString[9] -48;
  Temp2 = (byte)InString[10] -48;
  Minute = Temp1*10 + Temp2;
  // now Second
  Temp1 = (byte)InString[11] -48;
  Temp2 = (byte)InString[12] -48;
  Second = Temp1*10 + Temp2;
}

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

void loop () {
    delay(1000);
    //--------------------set clock-------------------------
    // If something is coming in on the serial line, it's
    // a time correction so set the clock accordingly.
    if (Serial.available()) {
    GetDateStuff(Year, Month, Date, DoW, Hour, Minute, Second);

    Clock.setClockMode(false);  // set to 24h
    //setClockMode(true); // set to 12h

    Clock.setYear(Year);
    Clock.setMonth(Month);
    Clock.setDate(Date);
    Clock.setDoW(DoW);
    Clock.setHour(Hour);
    Clock.setMinute(Minute);
    Clock.setSecond(Second);
    }
    //-------------------show clock---------------------------
    DateTime now = RTC.now();
    Serial.print(now.year(), DEC);
    Serial.print('/');
    Serial.print(now.month(), DEC);
    Serial.print('/');
    Serial.print(now.day(), DEC);
    Serial.print(' ');
    Serial.print(now.hour(), DEC);
    Serial.print(':');
    Serial.print(now.minute(), DEC);
    Serial.print(':');
    Serial.print(now.second(), DEC);
    Serial.print(' ');
   //-------------------show temperature---------------------------
   tempC = Clock.getTemperature();
   Serial.print(tempC);
   Serial.println("dgC");
}
The code is actually combination from example source for DS3231 in Arduino IDE. This code will help to set time, show clock, and show temperature.






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