Arduino UNO DS3231高精度RTC芯片制作时钟

DS3231 模块

是一个时钟模块，上面包含一个纽扣电池位置，可以在主机断电的情况下还可以继续计算时间，以便以后记录使用。

模块参数：
　　1.尺寸:38mm(长)*22mm(宽)*14mm(高)
　　2.重量:8g
　　3.工作电压:3.3--5.5V
　　4.时钟芯片:高精度时钟芯片DS3231
　　5.时钟精度:0-40℃范围内,精度2ppm,年误差约1分钟
　　6.带2个日历闹钟
　　7.可编程方波输出
　　8.实时时钟产生秒、分、时、星期、日期、月和年计时，并提供有效期到2100年的闰年补偿
　　9.芯片内部自带温度传感器,精度为±3℃
　　10.存储芯片:AT24C32(存储容量32K)
　　11.IIC总线接口,最高传输速度400KHz(工作电压为5V时)
　　12.可级联其它IIC设备,24C32地址可通过短路A0/A1/A2修改,默认地址为0x57
　　13.带可充电电池LIR2032,保证系统断电后,时钟任然正常走动

实验效果

通过设定时间的程序后，

我们运行显示时间的程序，就可以看到时钟模块当前的时间了

BOM表

Arduino UNO *1

DS3231 时钟模块 *1

跳线若干

接线

Arduino Uno DS3231

GND <---> GND

5V <---> VCC

A4(SDA) <---> SDA

A5 (SCL) <---> SCL

程序

需要下载库

http://www.rinkydinkelectronics.com/library.php?id=74

设置时间的程序

// 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 <DS3231.h>// Init the DS3231 using the hardware interface
DS3231  rtc(SDA, SCL);void setup()
{// Setup Serial connectionSerial.begin(115200);// Uncomment the next line if you are using an Arduino Leonardo//while (!Serial) {}// Initialize the rtc objectrtc.begin();// The following lines can be uncommented to set the date and timertc.setDOW(WEDNESDAY);     // Set Day-of-Week to SUNDAYrtc.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-WeekSerial.print(rtc.getDOWStr());Serial.print(" ");// Send dateSerial.print(rtc.getDateStr());Serial.print(" -- ");// Send timeSerial.println(rtc.getTimeStr());// Wait one second before repeating :)delay (1000);
}

显示时间的程序

// 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 <DS3231.h>// Init the DS3231 using the hardware interface
DS3231  rtc(SDA, SCL);void setup()
{// Setup Serial connectionSerial.begin(115200);// Uncomment the next line if you are using an Arduino Leonardo//while (!Serial) {}// Initialize the rtc objectrtc.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-WeekSerial.print(rtc.getDOWStr());Serial.print(" ");// Send dateSerial.print(rtc.getDateStr());Serial.print(" -- ");// Send timeSerial.println(rtc.getTimeStr());// Wait one second before repeating :)delay (1000);
}

思路讲解

1，#include <DS3231.h> //加载DS3231库

2，DS3231 rtc(SDA, SCL); //设置I2C

3，rtc.begin(); //建立RTC对象

4，

rtc.setDOW(WEDNESDAY); // 设置星期几，例如 SUNDAY
rtc.setTime(12, 0, 0); // 设置时间 12:00:00 (24小时制)
rtc.setDate(1, 1, 2014); // 设置日期 1月，1日，2014 年

如果在显示程序中，或不需要设置时间的时候，可以在前面加//给注释掉

5，

rtc.getDOWStr() 获取星期几

rtc.getDateStr() 获取日期

rtc.getTimeStr() 获取时间