// SQW は無効
// RTC の SDA を A4,
//        SCL を A5 に接続

#include "RTClib.h"

RTC_DS1307 rtc;

const char daysOfWeek[7][5] = {
  "日", "月", "火", "水",
  "木", "金", "土"
};

void setup() {
  Serial.begin(115200);

  if(!rtc.begin()) {
    Serial.println("RTC が見つかりません");
    Serial.flush();
    abort();
  }

}

void printDateTime(DateTime now) {
  Serial.print("現在の時刻: ");

  Serial.print(now.year(), DEC);
  Serial.print(" 年 ");

  Serial.print(now.month(), DEC);
  Serial.print(" 月 ");

  Serial.print(now.day(), DEC);
  Serial.print(" 日 ");

  Serial.print("(");
  Serial.print(daysOfWeek[now.dayOfTheWeek()]);
  Serial.print(") ");

  Serial.print(now.hour(), DEC);
  Serial.print(" 時 ");

  Serial.print(now.minute(), DEC);
  Serial.print(" 分 ");

  Serial.print(now.second(), DEC);
  Serial.println(" 秒");
}

void loop() {
  DateTime now = rtc.now();

  printDateTime(now);
  delay(1000);
}