Real Time Clock Module DS1307 CR2032 Battery BRD42 ,R16

DescriptionThe DS1307 I2C Real Time Clock chips (RTC)I2C EEPROM Memory 24C32 32KAdopt LIR2032 rechargeable lithium battery, with the charging circuitSolved the problem of DS1307 with battery backup can not read and write.Fully charged, can provide the DS1307 timing for 1 year .Compact design, 27mm * 28mm * 8.4mmLead off clock pin of DS1307 to provide clock signal for MCU .Can be cascaded to other I2C devicesApplication:It is used in date and time applicationsGetting started with the Real Time Clock Module DS1307This post is about how to use the DS1307 Real Time Clock (RTC) module with the Arduino. You can also follow this guide for other similar modules like the DS3231 RTC. This example displays date and time on the serial monitor. This module uses I2C communication. This means that it communicates with the Arduino using just 2 pins. Hardware requiredArduino UNODS1307 RTC moduleJumper wiresConnecting the HardwareConnect your Real Time Clock module to your Arduino as in the schematics below.Wiring the RTC module is pretty straightforwardPinWiring to Arduino UnoSCLA5SDAA4VCC5VGNDGND If you’re using other Arduino board rather than the uno, chek out what are their SCL and SDA pins.Nano: SDA (A4); SCL(A5)MEGA: SDA (20); SCL(21)Leonardo: SDA (20); SCL(21)Code#include <Wire.h> #define DS3231_I2C_ADDRESS 0x68 // Convert normal decimal numbers to binary coded decimal byte decToBcd(byte val){ return( (val/10*16) (val) ); } // Convert binary coded decimal to normal decimal numbers byte bcdToDec(byte val){ return( (val/16*10) (val) ); } void setup(){ Wire.begin(); Serial.begin(9600); // set the initial time here: // DS3231 seconds, minutes, hours, day, date, month, year setDS3231time(30,42,16,5,13,10,16); } void setDS3231time(byte second, byte minute, byte hour, byte dayOfWeek, byte dayOfMonth, byte month, byte year){ // sets time and date data to DS3231 Wire.beginTransmission(DS3231_I2C_ADDRESS); Wire.write(0); // set next input to start at the seconds register Wire.write(decToBcd(second)); // set seconds Wire.write(decToBcd(minute)); // set minutes Wire.write(decToBcd(hour)); // set hours Wire.write(decToBcd(dayOfWeek)); // set day of week (1=Sunday, 7=Saturday) Wire.write(decToBcd(dayOfMonth)); // set date (1 to 31) Wire.write(decToBcd(month)); // set month Wire.write(decToBcd(year)); // set year (0 to 99) Wire.endTransmission(); } void readDS3231time(byte *second, byte *minute, byte *hour, byte *dayOfWeek, byte *dayOfMonth, byte *month, byte *year){ Wire.beginTransmission(DS3231_I2C_ADDRESS); Wire.write(0); // set DS3231 register pointer to 00h Wire.endTransmission(); Wire.requestFrom(DS3231_I2C_ADDRESS, 7); // request seven bytes of data from DS3231 starting from register 00h *second = bcdToDec(Wire.read() & 0x7f); *minute = bcdToDec(Wire.read()); *hour = bcdToDec(Wire.read() & 0x3f); *dayOfWeek = bcdToDec(Wire.read()); *dayOfMonth = bcdToDec(Wire.read()); *month = bcdToDec(Wire.read()); *year = bcdToDec(Wire.read()); } void displayTime(){ byte second, minute, hour, dayOfWeek, dayOfMonth, month, year; // retrieve data from DS3231 readDS3231time(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month, &year); // send it to the serial monitor Serial.print(hour, DEC); // convert the byte variable to a decimal number when displayed Serial.print(":"); if (minute<10){ Serial.print("0"); } Serial.print(minute, DEC); Serial.print(":"); if (second<10){ Serial.print("0"); } Serial.print(second, DEC); Serial.print(" "); Serial.print(dayOfMonth, DEC); Serial.print("/"); Serial.print(month, DEC); Serial.print("/"); Serial.print(year, DEC); Serial.print(" Day of week: "); switch(dayOfWeek){ case 1: Serial.println("Sunday"); break; case 2: Serial.println("Monday"); break; case 3: Serial.println("Tuesday"); break; case 4: Serial.println("Wednesday"); break; case 5: Serial.println("Thursday"); break; case 6: Serial.println("Friday"); break; case 7: Serial.println("Saturday"); break; } } void loop(){ displayTime(); // display the real-time clock data on the Serial Monitor, delay(1000); // every second }Open the serial monitor at a baud rate of 9600 and you’ll see the results.Here’s the Serial Monitor displaying the current date and time.