Arduino--DS3231实时时钟模块

（1）简介

DS3231是一种实时的RCT IC芯片，通过IIC接口进行通信，默认IIC通信地址为（0X68，应该是在头文件中有体现，大概看了下也没找见）,其内部还集成了晶体振荡器和温度传感器，无需连接外部晶体。

DS3231模块如下图所示，包含RTC芯片和一个32K的EEPROM
自身带有3V CR2032锂电池，掉电时间不变

包括年、月、日、时、分、秒等具体时间信息

（2）连线

主要是IIC接口，本实验室是基于Arduino UNO使用，其他开发板的IIC管脚参考以下链接：
https://blog.csdn.net/u011816009/article/details/106566177

UNO	DS3231
5V	VCC
GND	GND
A4	SDA
A5	SCL

（3）程序

DS3231的程序分为两个部分，第一部分是设置起始日历信息（年、月、日、时、分、秒），第二部分是具体显示部分，分别阐述如下：

设置日历

// DS3231_Serial_Easy
// Copyright (C)2015 Rinky-Dink Electronics, Henning Karlsen. All right reserved
// web: http://www.RinkyDinkElectronics.com/
//
// A quick demo of how to use my DS3231-library to 
// quickly send time and date information over a serial link
//
// To use the hardware I2C (TWI) interface of the Arduino you must connect
// the pins as follows:
//
// Arduino Uno/2009:
// ----------------------
// DS3231:  SDA pin   -> Arduino Analog 4 or the dedicated SDA pin
//          SCL pin   -> Arduino Analog 5 or the dedicated SCL pin
//
// Arduino Leonardo:
// ----------------------
// DS3231:  SDA pin   -> Arduino Digital 2 or the dedicated SDA pin
//          SCL pin   -> Arduino Digital 3 or the dedicated SCL pin
//
// Arduino Mega:
// ----------------------
// DS3231:  SDA pin   -> Arduino Digital 20 (SDA) or the dedicated SDA pin
//          SCL pin   -> Arduino Digital 21 (SCL) or the dedicated SCL pin
//
// Arduino Due:
// ----------------------
// DS3231:  SDA pin   -> Arduino Digital 20 (SDA) or the dedicated SDA1 (Digital 70) pin
//          SCL pin   -> Arduino Digital 21 (SCL) or the dedicated SCL1 (Digital 71) pin
//
// The internal pull-up resistors will be activated when using the 
// hardware I2C interfaces.
//
// You can connect the DS3231 to any available pin but if you use any
// other than what is described above the library will fall back to
// a software-based, TWI-like protocol which will require exclusive access 
// to the pins used, and you will also have to use appropriate, external
// pull-up resistors on the data and clock signals.
//
 
#include 
 
// Init the DS3231 using the hardware interface
DS3231  rtc(SDA, SCL);
 
void setup()
{
  // Setup Serial connection
  Serial.begin(115200);
  // Uncomment the next line if you are using an Arduino Leonardo
  //while (!Serial) {}
  
  // Initialize the rtc object
  rtc.begin();
  
  // The following lines can be uncommented to set the date and time
  rtc.setDOW(FRIDAY);     // Set Day-of-Week to SUNDAY
  rtc.setTime(14, 26, 50);     // Set the time to 12:00:00 (24hr format)
  rtc.setDate(3, 8, 2019);   // Set the date to January 1st, 2014
}
 
void loop()
{
  // Send Day-of-Week
  Serial.print(rtc.getDOWStr());
  Serial.print(" ");
  
  // Send date
  Serial.print(rtc.getDateStr());
  Serial.print(" -- ");
 
  // Send time
  Serial.println(rtc.getTimeStr());
  
  // Wait one second before repeating :)
  delay (1000);
}

时钟显示

#include 
 
// Init the DS3231 using the hardware interface
DS3231  rtc(SDA, SCL);
 
void setup()
{
  // Setup Serial connection
  Serial.begin(115200);
  // Uncomment the next line if you are using an Arduino Leonardo
  //while (!Serial) {}
  
  // Initialize the rtc object
  rtc.begin();
  
  // The following lines can be uncommented to set the date and time
  //rtc.setDOW(WEDNESDAY);     // Set Day-of-Week to SUNDAY
  //rtc.setTime(12, 0, 0);     // Set the time to 12:00:00 (24hr format)
  //rtc.setDate(1, 1, 2014);   // Set the date to January 1st, 2014
}
 
void loop()
{
  // Send Day-of-Week
  Serial.print(rtc.getDOWStr());
  Serial.print(" ");
  
  // Send date
  Serial.print(rtc.getDateStr());
  Serial.print(" -- ");
 
  // Send time
  Serial.println(rtc.getTimeStr());
  
  // Wait one second before repeating :)
  delay (1000);
}