DS1307时钟模块简介
DS1307是一款低功耗，具有56字节非失性RAM的全BCD码时钟日历实时时钟芯片，地址和数据通过两线双向的串行总线的传输，芯片可以提供秒，分，小时等信息，每一个月的天数能自动调整。并且有闰年补偿功能，记年上限2100。AM/PM 标志位决定时钟工作于24小时或12小时模式，芯片有一个内置的电源感应电路，具有掉电检测和电池切换功能。
模块配备了一个后备2032可充电锂电池，并带充电电路，充满电后可提供最长一年的计时。保留了4KB的EEPROM的内存，用以记录更多闹钟和一些事件信息。预留一个DS18B20数字温度传感器接口，根据需要焊接。
EEPROM和DS1307共用一个IIC通信接口，用器件地址加以区分。
模块引脚定义
SQ引脚已经接了上拉电阻，当DS1307芯片内SQWE位置1，则可输出四种频率的脉冲信号1Hz、4…096KHz、8.192KHz、32.768KHz
Arduino UNO与模块接线
测试代码
在Arduino IDE库管理器搜索DS1307，并安装如图示所例程库
打开setTimeAndSqw.ino例程
/*!* @file setTimeAndSqw.ino* @brief Set time and start timing, set pin sqw output* @details Read the time and pin sqw mode* @copyright Copyright (c) DFRobot Co.Ltd ()* @license The MIT License (MIT)* @author [qsjhyy](yihuan.huang@)* @version V1.0* @date -11-18* @url /DFRobot/DFRobot_DS1307*/#include <DFRobot_DS1307.h>/* Constructor */DFRobot_DS1307 DS1307;void setup(){Serial.begin(115200);// Initialize sensorwhile( !(DS1307.begin()) ){Serial.println("Communication with device failed, please check connection");delay(3000);}Serial.println("Begin ok!");/*** According to the set time type, input the value of the corresponding range, set time* type Time type to be obtained, eTimeType_t:* eSEC, eMIN, eHR, eDOW, eDATE, eMTH, eYR* typeTime According to the selected time type, write the value of the corresponding range* When setting eSEC type, range: 00-59* When setting eMIN type, range: 00-59* When setting eHR type, range: 00-23* When setting eDOW type, range: 01-07* When setting eDATE type, range: 01-31* When setting eMTH type, range: 01-12* When setting eYR type, range: 2000-2099* Note: Values out of range will result in a setting error*/DS1307.setTypeTime(DS1307.eYR, 2000);/*** Get the time of one type from rtc module and convert it to uint16_t* type Time type to be obtained, eTimeType_t:* eSEC, eMIN, eHR, eDOW, eDATE, eMTH, eYR* According to the selected time type, return the value uint16_t of the corresponding range* When reading eSEC type, range: 00-59* When reading eMIN type, range: 00-59* When reading eHR type, range: 00-23* When reading eDOW type, range: 01-07* When reading eDATE type, range: 01-31* When reading eMTH type, range: 01-12* When reading eYR type, range: 2000-2099*/Serial.print("get type time: ");Serial.println(DS1307.getTypeTime(DS1307.eYR));/*** Stop RTC timer function* this bit is part of the seconds byte*/DS1307.stop();/*** According to the available array, set all the time* setTimeBuff Array in the following format (type is uint16_t)* setTimeBuff[0] for eSEC type, range: 00-59* setTimeBuff[1] for eMIN type, range: 00-59* setTimeBuff[2] for eHR type, range: 00-23* setTimeBuff[3] for eDOW type, range: 01-07* setTimeBuff[4] for eDATE type, range: 01-31* setTimeBuff[5] for eMTH type, range: 01-12* setTimeBuff[6] for eYR type, range: 2000-2099* Note: Values out of range will result in a setting error*/uint16_t setTimeBuff[7] = {5, 1, 17, 3, 9, 11, };//设置当前时间DS1307.setTime(setTimeBuff);/*** Start RTC timing function* this bit is part of the seconds byte*/DS1307.start();/*** control the operation of the SQW/OUT pin* mode SQW Pin output mode:* eSquareWave_LOW, eSquareWave_HIGH, eSquareWave_1Hz, * eSquareWave_4kHz, eSquareWave_8kHz, eSquareWave_32kHz*/DS1307.setSqwPinMode(DS1307.eSquareWave_1Hz);}void loop(){/*** Get the current output mode of SQW/OUT pin* eSqwPinMode_t:* eSquareWave_LOW, eSquareWave_HIGH, eSquareWave_1Hz, * eSquareWave_4kHz, eSquareWave_8kHz, eSquareWave_32kHz*/if(DS1307.eSquareWave_1Hz == DS1307.getSqwPinMode()){Serial.print("SQW/OUT pin: 1Hz | ");}/*** Get the time from rtc module and convert it to uint16_t* getTimeBuff Array for buffering the obtained time, uint16_t ** getTimeBuff[0] for eSEC type, range: 00-59* getTimeBuff[1] for eMIN type, range: 00-59* getTimeBuff[2] for eHR type, range: 00-23* getTimeBuff[3] for eDOW type, range: 01-07* getTimeBuff[4] for eDATE type, range: 01-31* getTimeBuff[5] for eMTH type, range: 01-12* getTimeBuff[6] for eYR type, range: 2000-2099*/uint16_t getTimeBuff[7] = {0};DS1307.getTime(getTimeBuff);char outputarr[128];sprintf(outputarr, "time: %d/%d/%d-%d %d:%d:%d\r\n",getTimeBuff[6],getTimeBuff[5],getTimeBuff[4],getTimeBuff[3],getTimeBuff[2],getTimeBuff[1],getTimeBuff[0]);Serial.print(outputarr);delay(1000);}
实验结果
通过串口助手显示出进行初始时间设置后开始计时，并在模块的SQ引脚用示波器测得输出1Hz的秒脉冲
