#include <Time.h>
 #include <OneWire.h>
#include <DallasTemperature.h>


#define ONE_WIRE_BUS 12 // ds18b20 pin 12


OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
#include <LiquidCrystal.h>
LiquidCrystal lcd(22, 24,  31, 30, 33, 32); // выводы lcd  4 6 11 12 13 14
int  d, m, w, d1, y1, dmax, m1, a  = 1;
int y = 2011; // год
char* weekd[]= {"Sun", "Mon","Tue","Wed","Thu","Fri","Sat"};

char* mon[]={"Jan", "Feb" ,"Mar","Apr","May","Jun","Jul","Aug",
"Sep","Oct","Nov","Dec"};
#define TIME_MSG_LEN  11   // time sync to PC is HEADER followed by unix time_t as ten ascii digits
#define TIME_HEADER  'T'   // Header tag for serial time sync message
#define TIME_REQUEST  7    // ASCII bell character requests a time sync message

void setup()  {
  Serial.begin(9600);
  lcd.begin(20, 2);
  setSyncProvider( requestSync);  //set function to call when sync required
  Serial.println("Waiting for sync message");
  lcd.print("Waiting for sync ");
  sensors.begin();
}

void loop(){
  if(Serial.available() )
  {
    processSyncMessage();
  }
  if(timeStatus()!= timeNotSet)
  {
    digitalWrite(13,timeStatus() == timeSet); // on if synced, off if needs refresh
digitalClockDisplay();
  }
  delay(1000);

}
void digitalClockDisplay(){
  // digital clock display of the time
  lcd.clear();
  lcd.setCursor(6,0);


  lcd.print(hour());

  printDigits(minute());
  printDigits(second());
  lcd.setCursor(2,1);
  lcd.print(day());
  lcd.print(" " );
  m = month();
  a = m - 1;
  w = weekday();
  d1 = w - 1;
  lcd.print(mon[a]);
  lcd.print(" ");

  lcd.print(weekd[d1]) ;

  lcd.print(" ");

   lcd.print("T: ");
   sensors.requestTemperatures();
 lcd.print(sensors.getTempCByIndex(0));

}


void printDigits(int digits){
  // utility function for digital clock display: prints preceding colon and leading 0
  lcd.print(":");
  if(digits < 10)
    lcd.print('0');
  lcd.print(digits);
}

void processSyncMessage() {
  // if time sync available from serial port, update time and return true
  while(Serial.available() >=  TIME_MSG_LEN ){  // time message consists of a header and ten ascii digits
    char c = Serial.read() ;
    Serial.print(c);
    if( c == TIME_HEADER ) {
      time_t pctime = 0;
      for(int i=0; i < TIME_MSG_LEN -1; i++){
        c = Serial.read();
        if( c >= '0' && c <= '9'){
          pctime = (10 * pctime) + (c - '0') ; // convert digits to a number
        }
      }
      setTime(pctime);   // Sync Arduino clock to the time received on the serial port
    }
  }
}

time_t requestSync()
{
  //Serial.print(TIME_REQUEST,byte);
  return 0; // the time will be sent later in response to serial mesg
}