C76 DS1307 RTC 리얼타임 클럭모듈 아두이노 시계

* AT24C32 데이터시트

http://ww1.microchip.com/downloads/en/DeviceDoc/doc0336.pdf

* DS1307 데이터시트

https://datasheets.maximintegrated.com/en/ds/DS1307.pdf

** 다음은 아두이노와의 연결 및 샘플코드입니다.

#include "Wire.h"#define DS1307_I2C_ADDRESS 0x68  // the I2C address of Tiny RTCbyte second, minute, hour, dayOfWeek, dayOfMonth, month, year;// Convert normal decimal numbers to binary coded decimalbyte decToBcd(byte val){ return ( (val/10*16) + (val) );}// Convert binary coded decimal to normal decimal numbersbyte bcdToDec(byte val){ return ( (val/16*10) + (val) );}// Function to set the currnt time, change the second&minute&hour to the right timevoid setDateDs1307()                {  second =45;   minute = 29;  hour  = 13;  dayOfWeek = 2;  dayOfMonth =18;  month =9;  year= 12;  Wire.beginTransmission(DS1307_I2C_ADDRESS);  Wire.write(decToBcd(0));  Wire.write(decToBcd(second));    // 0 to bit 7 starts the clock  Wire.write(decToBcd(minute));  Wire.write(decToBcd(hour));      // If you want 12 hour am/pm you need to set                                  // bit 6 (also need to change readDateDs1307)  Wire.write(decToBcd(dayOfWeek));  Wire.write(decToBcd(dayOfMonth));  Wire.write(decToBcd(month));  Wire.write(decToBcd(year));  Wire.endTransmission();}// Function to gets the date and time from the ds1307 and prints resultvoid getDateDs1307(){ // Reset the register pointer Wire.beginTransmission(DS1307_I2C_ADDRESS); Wire.write(decToBcd(0)); Wire.endTransmission(); Wire.requestFrom(DS1307_I2C_ADDRESS, 7); second     = bcdToDec(Wire.read() & 0x7f); minute     = bcdToDec(Wire.read()); hour       = bcdToDec(Wire.read() & 0x3f);  // Need to change this if 12 hour am/pm dayOfWeek  = bcdToDec(Wire.read()); dayOfMonth = bcdToDec(Wire.read()); month      = bcdToDec(Wire.read()); year       = bcdToDec(Wire.read());   Serial.print(hour, DEC); Serial.print(":"); Serial.print(minute, DEC); Serial.print(":"); Serial.print(second, DEC); Serial.print("  "); Serial.print(month, DEC); Serial.print("/"); Serial.print(dayOfMonth, DEC); Serial.print("/"); Serial.print(year,DEC); Serial.print("  "); Serial.println(); //Serial.print("Day of week:");}void setup() { Wire.begin(); Serial.begin(19200); setDateDs1307(); //Set current time;}void loop() { delay(2000); getDateDs1307();//get the time data from tiny RTC }