#include <Wire.h>
#include <RTClib.h>
#include<LiquidCrystal_I2C.h>
#include<Keypad.h>
RTC_DS1307 RTC;
LiquidCrystal_I2C lcd(0x27,16,2);
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS]={
  {'1','2','3','U'},
  {'4','5','6','D'},
  {'7','8','9','L'},
  {'#','0','*','R'}
};
char keypressed;
byte rowPins[ROWS]={5,4,3,2};
byte colPins[COLS]={9,8,7,6};
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins,ROWS,COLS);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Wire.begin();
  RTC.begin();
  RTC.adjust(DateTime(2023,1,11,15,30,45));
  lcd.init();
  lcd.backlight();
  while(1)
  {
    SetTime();
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  DateTime now=RTC.now();
  lcd.setCursor(3,0);
  displayData(now.year());
  lcd.print('-');
  displayData(now.month());
  lcd.print('-');
  displayData(now.day());
  lcd.setCursor(4,1);
  displayData(now.hour());
  lcd.print(':');
  displayData(now.minute());
  lcd.print(':');
  displayData(now.second());
  
}
void displayData(u32 data)
{
  if(data<10)
  {
    lcd.print(0);
    lcd.print(data);
  }
  else
  lcd.print(data);
}
 void SetTime()
 {
   lcd.setCursor(3,0);
   lcd.print("____-__-__");
   lcd.setCursor(3,1);
   lcd.print("____:__:__");
   
   //
   while(1)
   {
     changesite(2,0);
     //CursorTwink(3,0);
     //changesite(3,0);
   }
 }
 void CursorTwink(uint8_t col,uint8_t row)
 {
   
   lcd.setCursor(col,row);
   lcd.print(' ');
   delay(100);
   lcd.setCursor(col,row);
   lcd.print('_');
   delay(100);
   
 }
void changesite(uint8_t col,uint8_t row)
{
    
      keypressed = keypad.getKey();
     //if (keypressed == 'U') 
      //{      
      //row=row-1;
      //CursorTwink(col,row);
      //}
    //else if (keypressed == 'D') 
      //{
      //row=row+1;
      //CursorTwink(col,row);
      //}
    //else
      //CursorTwink(col,row);
    switch (keypressed)
    {
      case 'U':row=row-1;CursorTwink(col,row);
      case 'D':row=row+1;CursorTwink(col,row);
      case 0 :CursorTwink(col,row);
    }
}
  //char key=keypad.getKey();
  //switch(keypad.getKey())
  //case D: row=row+1;break;
  //case U: row=row-1;break;