DS1307 Real Time Clock RTC Module

DS1307 Real Time Clock RTC Module 

The DS1307 RTC Module is a low-power, full binary-coded decimal (BCD) real-time clock IC that keeps track of seconds, minutes, hours, day, date, month, and year. It communicates using the I2C (Two-Wire) interface, making it easy to interface with microcontrollers like Arduino, ESP8266/ESP32, Raspberry Pi, PIC, and AVR.

The module typically includes a 32.768 kHz crystal oscillator and a CR2032 backup battery holder, allowing it to maintain accurate timekeeping even when the main power supply is disconnected. Many modules also include an AT24C32 EEPROM for additional non-volatile data storage.

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Specifications 

• DS1307 I2C real-time clock chip (RTC)
• AT24C32 32K I2C EEPROM memory
• Two wire I2C interface.
• Hour : Minutes : Seconds AM/PM.
• Day Month, Date – Year.
• DS1307 based RTC.
• 1Hz output pin.
• 56 Bytes of Non-volatile memory available to user.
• The DS1307 is accessed via the I2C protocol.
• Compact design, 27mm * 28mm * 8.4mm

Applications

• Digital clocks and real-time monitoring systems
• Data loggers (temperature, humidity, power usage, sensor monitoring)
• Alarms and reminder systems
• IoT devices requiring time stamping
• Attendance systems and RFID-based logging
• Timers, counters, and scheduling systems
• Home automation devices
• Embedded systems needing accurate real-time information
• Industrial controllers where logs need proper date/time tracking
• Event-triggered devices (time-based relays, alarms, lighting systems)