Added a method to get temperature of the module

src/libs/RTClib-master/RTClib.cpp

@@ -506,3 +506,16 @@ void RTC_DS3231::writeSqwPinMode(Ds3231SqwPinMode mode) {
 
   //Serial.println( read_i2c_register(DS3231_ADDRESS, DS3231_CONTROL), HEX);
 }
+
+float RTC_DS3231::getTemperature()
+{
+	//Lets tell which register we want to read
+	Wire.beginTransmission(DS3231_ADDRESS);
+	Wire._I2C_WRITE((byte)DS3231_TEMPREG);
+	Wire.endTransmission();
+	//Lets read it :
+	Wire.requestFrom((uint8_t)DS3231_ADDRESS, (uint8_t)2);
+	uint8_t upper = Wire._I2C_READ(), lower = Wire._I2C_READ();
+	
+	return (float) upper + (lower >> 6) * 0.25;
+}

src/libs/RTClib-master/RTClib.h

@@ -1,6 +1,7 @@
 // Code by JeeLabs http://news.jeelabs.org/code/
 // Released to the public domain! Enjoy!
 // Added a real begin verification for the ds3231 01/05/2019 Th3maz1ng
+// Adding DS3231 internal temp sensor reading 
 
 #ifndef _RTCLIB_H_
 #define _RTCLIB_H_
@@ -20,6 +21,7 @@ class TimeSpan;
 #define DS3231_ADDRESS  0x68
 #define DS3231_CONTROL  0x0E
 #define DS3231_STATUSREG 0x0F
+#define DS3231_TEMPREG 0x11
 
 #define SECONDS_PER_DAY 86400L
 
@@ -104,6 +106,7 @@ public:
     static DateTime now();
     static Ds3231SqwPinMode readSqwPinMode();
     static void writeSqwPinMode(Ds3231SqwPinMode mode);
+	float getTemperature();
 };