RTC Module DS1307

The RTC Module DS1307 provides precise real-time clock functionality for microcontroller and embedded projects.
Using a low-power I²C interface, it accurately keeps track of seconds, minutes, hours, day, date, month, and year, including automatic leap-year correction.

Equipped with a built-in 32.768 kHz crystal oscillator and a backup battery holder, the DS1307 maintains accurate timekeeping even when the main power is removed—making it ideal for data loggers, IoT devices, home automation systems, and portable electronics.

🔹 Key Features

• Accurate Real-Time Clock: Tracks full calendar and 24-hour or 12-hour format with AM/PM.

• I²C Interface: Simple 2-wire communication for Arduino and Raspberry Pi.

• Battery Backup: Retains time during power outages with a CR2032/CR1220 cell.

• Low Power Consumption: Less than 500 nA in battery-backup mode.

• Compact PCB Design: Ready-to-use with onboard pull-up resistors and power LED.

🔹 Technical Specifications

• Operating Voltage: 4.5 V – 5.5 V DC

• Timekeeping Accuracy: ±2 minutes/month (typical)

• Communication Protocol: I²C (400 kHz Fast Mode)

• Clock Format: 24-hour or 12-hour with AM/PM

• Battery Type: CR2032 or CR1220 coin cell (not included)

• Operating Temperature: –40 °C to +85 °C

• Dimensions: Approx. 28 mm × 27 mm × 8 mm

🔹 Applications & Use Cases

• Data Logging Systems – Precise timestamping of sensor data.

• Home & Industrial Automation – Scheduled control of devices.

• IoT & Smart Projects – Real-time scheduling in connected devices.

• Wearables & Portable Electronics – Maintain clock accuracy without main power.

• Educational Projects – Learn I²C communication and timekeeping integration.

🔹 Advantages for Makers & Engineers

• Seamless integration with Arduino and Accessories and Electronics Components.

• Widely supported by Arduino libraries for rapid prototyping.

• Reliable timekeeping with minimal power consumption.

🔹 Safety & Precautions

• Insert a fresh backup battery to maintain time during power loss.

• Observe correct polarity when connecting power and battery.

• Keep module away from strong magnetic fields to prevent oscillator drift.

🔗 Helpful Internal Links

• Explore Arduino and Accessories for compatible microcontroller boards.

• Browse Electronics Components for related sensors and modules.

• Check Tools and Accessories for assembly equipment.

🎥 Video Tutorial

[YouTube tutorial link here]

📝 Product Summary

The DS1307 RTC Module is a reliable, low-power real-time clock with I²C interface and battery backup, ensuring accurate timekeeping for Arduino, Raspberry Pi, IoT automation, data logging, and smart electronics projects.