#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display

#include <RTClib.h>
RTC_DS1307 RTC;

int switch_status = 1; //スイッチの状態。最初はLOWが入力されている

const int BUTTON_SEL = 7; //定数BUTTONを設定

void setup() {
  Serial.begin( 9600 );
  RTC.begin();

  // RTC.adjust(DateTime(2023, 1, 30, 1,1, 0));

  lcd.init();                      // initialize the lcd 
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Digital Counter");

  pinMode( 13, OUTPUT);
  digitalWrite( 13, LOW); //基盤のＬＥＤ

 	pinMode( BUTTON_SEL, INPUT_PULLUP); //BUTTON_SEL ピンを入力に設定

}

void loop() {
  // put your main code here, to run repeatedly:

    if (digitalRead( BUTTON_SEL) == HIGH){
      digitalWrite(13, HIGH); //基盤のＬＥＤ
      Serial.println( digitalRead(BUTTON_SEL) );
      
    }
    else{
      digitalWrite(13, LOW); 
      Serial.println( digitalRead(BUTTON_SEL) );
      lcd.setCursor(0, 0);
      lcd.print("    ");
    }


    if (RTC.isrunning()) {
  
        lcd.setCursor(0, 0);

        DateTime now = RTC.now();
        lcd.print(now.year(), DEC);
        lcd.print('/');
        lcd.print(now.month(), DEC);
        lcd.print('/');
        lcd.print(now.day(), DEC);
        lcd.print("                ");
        
        lcd.setCursor(0, 1);
    
        if ( now.hour() <= 9){  // 10以下0付け
          lcd.print('0');
        }
        lcd.print(now.hour(), DEC);
        lcd.print(':');
        if ( now.minute() <= 9){  // 10以下0付け
          lcd.print('0');
        }
        lcd.print(now.minute(), DEC);
        lcd.print(':');
        if ( now.second() <= 9){  // 10以下0付け
          lcd.print('0');
        }
        lcd.print(now.second());
        lcd.print("                ");
    }else{
        lcd.print("RTC not find    ");
    }
    delay(10);

}