#include "RTClib.h"

RTC_DS1307 rtc;             //实例化RTC

String daysOfTheWeek[7] = {"周日", "周一", "周二", "周三", "周四", "周五", "周六"};

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

  if (! rtc.begin()) {
    Serial.println("没有找到RTC");
    Serial.flush();         //清空串口缓存。
    abort();               //abort()函数导致程序异常终止。
  }
}

void loop () {
  DateTime now = rtc.now();    //函数返回当前日期和时间。

  Serial.print("现在时间: ");
  Serial.print(now.year());
  Serial.print('/');
  Serial.print(now.month(), DEC);
  Serial.print('/');
  Serial.print(now.day(), DEC);
  Serial.print(" (");
  Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
  Serial.print(") ");
  Serial.print(now.hour(), DEC);
  Serial.print(':');
  Serial.print(now.minute(), DEC);
  Serial.print(':');
  Serial.print(now.second(), DEC);
  Serial.println();


  Serial.println();
  delay(3000);
}