The DS1307 Real Time Clock (RTC) Module is a reliable and easy-to-use timekeeping solution designed for Arduino, Raspberry Pi, ESP32, STM32, and other microcontroller projects. This compact RTC module uses the DS1307 chip to maintain accurate time tracking with support for seconds, minutes, hours, day, date, month, and year, along with AM/PM format. It includes onboard AT24C32 EEPROM memory for data storage and a backup battery slot to keep time running even when the system is powered off. Ideal for data logging, automation, scheduling, clocks, alarms, and any time-sensitive applications. Built on an I2C interface, it integrates smoothly into any embedded system.

Features:

• DS1307 RTC chip for accurate real-time clock functionality

• Supports full calendar: seconds, minutes, hours, day, date, month, year, AM/PM

• Onboard AT24C32 32K EEPROM for non-volatile data storage

• Backup battery support to retain time during power loss

• Two-wire I2C communication for easy interfacing

• 56 bytes of additional user-accessible NV RAM

• 1Hz square wave output pin

• Space available to solder DS18B20 temperature sensor

• Compact PCB design (27mm x 28mm x 8.4mm)

• Compatible with Arduino RTC libraries and standard I2C commands

• Perfect for time-stamped data logging and real-time applications

How to Use:

• Connect VCC, GND, SDA, and SCL pins to your microcontroller

• Insert a coin cell battery (not included) to preserve timekeeping

• Use Arduino RTC libraries (RTClib, DS1307RTC) or direct I2C communication

• Initialize RTC and set the date/time once; the module maintains time automatically

• Use EEPROM functions to store data that must persist after reboot

• Optional: Install a DS18B20 temperature sensor on the dedicated area

Application Instructions:

• Ideal for data logging applications such as temperature, humidity, and sensor monitoring

• Perfect for clocks, alarms, timers, scheduling systems

• Use in agriculture automation, home automation, and robotics

• Backup battery ensures real-time clock continuity during power cuts

• Works with 3.3V and 5V logic systems (depending on controller)

Safety Instructions:

• Ensure correct polarity when inserting the battery

• Keep away from excessive moisture or short circuits

• Do not apply voltage beyond module specifications

• Avoid bending or stressing the I2C pins

Specifications:

• RTC Chip: DS1307

• EEPROM: AT24C32 (32K)

• Interface: I2C (SDA, SCL)

• Output: 1Hz square wave

• User Memory: 56 bytes NV RAM

• Calendar Format: Seconds, minutes, hours, day, date, month, year, AM/PM

• Operating Voltage: 5V

• Dimensions: 27mm x 28mm x 8.4mm

• Battery: Lithium cell (not included)

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