Project: Use DS3231 RTC  to print Time, Date.. Use Thermistor for temp. Ability to set Alarm.
*/

//-----------------------------------------------------------------------------

//  Define variables.

#include <DS3231.h>   //Library for RTC

#include  <Wire.h>   //Allows comunication with TWI (Two Wire Interface)

#include <LiquidCrystal.h>  //Used for DS3231 and thermister

LiquidCrystal lcd(2, 3, 4, 5, 6, 7);  //Pins  used by the LCD

DS3231  rtc(SDA, SCL);

Time  t;

#define buz  11

int tempPin = 0;

int Hor;

int Min;

int Sec;

int  tempC;
int tempF;

int tempCDS3231;
int tempFDS3231;


//-------------------------------------------------------------------------
//  Used to fix Date, Time, Day of Week

  // Uncomment to adjust. Be sure to  // back once fixed.

  //rtc.setDOW(WEDNESDAY);     // Set Day-of-Week to  SUNDAY

  //rtc.setTime(01, 33, 00);     // Set the time to 12:00:00 (24hr  format)

  //rtc.setDate(23, 8, 2018);   // Set the date to August 8th, 2018

//--------------------------------------------------------------------------


void  setup()

{

  Wire.begin();

  rtc.begin();

  Serial.begin(9600);

  pinMode(buz, OUTPUT);

  lcd.begin(16,2);

  lcd.setCursor(0,0);

  t = rtc.getTime();

  Hor = t.hour;

  Min = t.min;

  Sec = t.sec;



}


//---------------------------------------------------------------------


void  loop()

{
  int tempReading = analogRead(tempPin);
  // This is OK
  double  tempK = log(10000.0 * ((1024.0 / tempReading - 1)));
  tempK = 1 /  (0.001129148 + (0.000234125 + (0.0000000876741 * tempK * tempK )) * tempK );       //  Temp Kelvin
  int tempC = tempK - 273.15;            // Convert Kelvin to Celcius
  int tempF = (tempC * 9.0)/ 5.0 + 32.0; // Convert Celcius to Fahrenheit

//-------------------------------------------------------------------------------------------
//Can  change the ABOVE tempC and tempF "int" to "float" this can give you temperatures  with two decimal points.
//Can also use "lcd.print(tempF, 1);" BELOW to print  with one decimal place or "lcd.print(tempF, 0);" // print without decimal place
//-------------------------------------------------------------------------------------------

lcd.setCursor(0,0);  //Top line of the LCD
lcd.print("    ");
lcd.print(rtc.getTimeStr());
lcd.print("    ");
lcd.setCursor(0,1);
lcd.print("      ");
lcd.print(rtc.getDateStr());


//----------------------------------------------------------

  lcd.setCursor(0,1);  //Second line of the LCD

tempFDS3231 = (tempCDS3231  * 1.8) + 32.0; // Convert C to F
tempCDS3231 = (rtc.getTemp());

 lcd.setCursor(0,1);
  lcd.print(tempF);
 lcd.print((char)223); //This creates a Degree symbol
 lcd.print("F  ");
 lcd.print(rtc.getDateStr());


//--------------------------------------------------------------------------

  t = rtc.getTime();

  Hor = t.hour;

  Min = t.min;

  Sec =  t.sec;


//-------------------------------------------------------------------------------------------
//Use  the BELOW "if" statement to set your desired alarm time
 if( Hor == 10 &&  (Min  == 00 || Min == 00)) //Comparing the current time with the Alarm time
//-------------------------------------------------------------------------------------------

{
Buzzer();

Buzzer();

lcd.clear();

lcd.print("Alarm  ON");

lcd.setCursor(0,1);

lcd.print("Wake Up!!");

Buzzer();

Buzzer();


}
  delay(1000);

}




void Buzzer()

{

digitalWrite(buz,HIGH);

delay(500);

digitalWrite(buz,  LOW);

delay(500);


}