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 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); }

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 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); }

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