On Table Clock & Temp

// Date and time functions using a DS1307 RTC connected via I2C and Wire lib
//rtc-lcm(sweach led ghat' beshe va 16 lcd be 6 va 15 lcd be 7 vasl beshe)-lm35(A0)-ir(57K ohm,1K ohm , be halat interrupt be paye 2 khroji mide)-lcd

#include <Wire.h>
#include<avr/sleep.h>
#include "RTClib.h"                  
#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x3f or 0x27 (depends on your chip) for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x3f, 20, 4);
RTC_DS1307 rtc;

char daysOfTheWeek[7][12] = {"   Sunday", "   Monday", "  Tuesday", "Wednesday", " Thursday", "   Friday", " Saturday"};

void setup () {
    lcd.begin();
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));// to set rtc init value by your pc time
    pinMode(6,OUTPUT);  
    digitalWrite(6,0);
    pinMode(7,OUTPUT);  
    digitalWrite(7,1);
    delay(300);
    attachInterrupt(0, wakeUpNow, LOW);
    lcd.backlight();
}

void loop () {
    pinMode(7,OUTPUT);
    digitalWrite(7,1);
    pinMode(6,OUTPUT);  
    for(int i=255;i>0; i=i-4){  
     analogWrite(6,i);
     delay(20);
    }
    finFunc();
    pinMode(6,INPUT);  //to put it to HiZ to low power using
    digitalWrite(6,0);
    pinMode(7,INPUT);  //to put it to HiZ to low power using
    digitalWrite(7,0);
    lcd.clear();
    lcd.setCursor(0,1);
    lcd.print("      stand by      ");
    lcd.setCursor(0,2);
    lcd.print("  hover your hand!  ");
    sleepNow();
    lcd.clear();
}
void finFunc(){
  for(int i=0; i<25; i++){
    mainFunc();
    delay(200);
  }
}
void mainFunc(){
    int temp = (5.0 * analogRead(A0) * 100.0) / 1024;
    DateTime now = rtc.now();
    lcd.setCursor(6,0);
    if(now.hour()<10)
      lcd.print("0");
    lcd.print(now.hour(), DEC);
              Serial.print("time:  ");
              Serial.println(now.hour(), DEC);
    lcd.print(':');
    if(now.minute()<10)
      lcd.print("0");
    lcd.print(now.minute(), DEC);
    lcd.print(':');
    if(now.second()<10)
      lcd.print("0");
    lcd.print(now.second(), DEC);
    lcd.print(" ");
    lcd.setCursor(0,1);
    lcd.print(now.year(), DEC);
    lcd.print('/');
    if(now.month()<10)
      lcd.print("0");
    lcd.print(now.month(), DEC);
    lcd.print('/');
    if(now.day()<10)
      lcd.print("0");
    lcd.print(now.day(), DEC);
    lcd.setCursor(11,1);
    lcd.print(daysOfTheWeek[now.dayOfTheWeek()]);
    lcd.setCursor(8,2);
    if(temp<10)
      lcd.print("0");
    lcd.print(temp);
                  Serial.print("temp:  ");
                  Serial.println(temp);
    lcd.print((char)223);
    lcd.print("C");
    lcd.setCursor(2,3);
    if     (temp>=43)
       lcd.print("High Temp Alert!"); 
    else if(temp>=31)
       lcd.print("    Too Hot!    "); 
    else if(temp>=28)
       lcd.print("      Hot!      "); 
    else if(temp>=23)
       lcd.print("      Norm      "); 
    else if(temp>=19)
       lcd.print("      Cold      "); 
    else if(temp>=15)
       lcd.print("    Too Cold    "); 
    else
       lcd.print(" Low Temp Alert "); 
    Serial.print("dipi:  "); 
    Serial.println(digitalRead(2));
    Serial.print("");
  }
  
  void sleepNow()      
{
    set_sleep_mode(SLEEP_MODE_PWR_DOWN);   // sleep mode is set here

    sleep_enable();          // enables the sleep bit in the mcucr register
                             // so sleep is possible. just a safety pin 
    attachInterrupt(0,wakeUpNow, LOW); // use interrupt 0 (pin 2) and run function
                                       // wakeUpNow when pin 2 gets LOW 
    sleep_mode();            // here the device is actually put to sleep!!
                             // THE PROGRAM CONTINUES FROM HERE AFTER WAKING UP
    sleep_disable();         // first thing after waking from sleep:
                             // disable sleep...
    detachInterrupt(0);      // disables interrupt 0 on pin 2 so the 
                             // wakeUpNow code will not be executed 
                             // during normal running time.
}

void wakeUpNow(){}