The upgraded Gravity I2C DS1307 RTC module is a compact and cost-effective Real Time Clock suitable for applications like time clocks and data loggers. This newer version is smaller and includes a high-precision crystal oscillator that significantly reduces time errors to about 1 second in 24 hours. The module is powered by a single-cell CR1220 battery, expected to last 3 to 5 years, and maintains a 4KB EEPROM for recording alarm and event information. Users can adjust the I2C address easily. With its Gravity I2C interface, the module connects seamlessly to the DFRobot Gravity IO expansion shield. It's compatible with the Arduino DS1307 library from DFRobot, facilitating straightforward time-setting and display functions, making it a practical choice for Data Acquisition (DA) applications. Note: The CR1220 cell battery does NOT come with the module, but you can buy one here Connection Diagram - DFRduino UNO R3 Specifications * Operating voltage: 5V * Interface: I2C (Gravity PH2.0-4P Interface & XH2.54 Pins) * IC Output Data: Hour, Minutes, Seconds, Week, Day, Month, Year * Leap-year Compensation * Accurate calendar up to the year 2100 * 1Hz Output Pin * 56 Bytes of Non-volatile memory available * 4KB ROM of EEPROM * Size: 0.81" x 1.06" (22mm x 27mm) * Weight: 6g Resources * Product wiki * Schematic & Layout * DFRobot DS1307 RTC Library * DFRobot DS1307 RTC Repository * Time Synchronization with Computer Pinout Num Label Description 1 VCC 5V 2 GND GND 3 SCL I2C-Clock 4 SDA I2C-Data 5 SQ SQ 6 VCC 5V 7 GND GND 8 SCL I2C-Clock 9 SDA I2C-SDA Package Contents * 1x Gravity: I2C DS1307 RTC Module * 1x Gravity-4Pin I2C/UART Cable * 1x XH2.54-5P Pin Headerfcv https://elecena.pl/product/22714051/gravity-i2c-ds1307-rtc-module 2023-03-06 https://elecena.pl/product/22714051/gravity-i2c-ds1307-rtc-module 2023-12-27 https://elecena.pl/product/22714051/gravity-i2c-ds1307-rtc-module 2024-09-19 https://elecena.pl/product/22714051/gravity-i2c-ds1307-rtc-module 2024-11-29 https://elecena.pl/product/22714051/gravity-i2c-ds1307-rtc-module 2024-11-30 https://elecena.pl/product/22714051/gravity-i2c-ds1307-rtc-module 2025-02-14 https://elecena.pl/product/22714051/gravity-i2c-ds1307-rtc-module 2025-04-11 https://elecena.pl/product/22714051/gravity-i2c-ds1307-rtc-module 2025-08-05 https://elecena.pl/product/22714051/gravity-i2c-ds1307-rtc-module 2025-11-28 https://elecena.pl/product/22714051/gravity-i2c-ds1307-rtc-module 2025-11-29