This module communicates via the I²C interface, allowing easy integration with popular microcontrollers such as Arduino, ESP32, ESP8266, Raspberry Pi, and other development boards. It is widely used in data logging, automation systems, digital clocks, and IoT projects where precise timekeeping is essential.

Key Features

• Accurate Timekeeping with battery backup

• I²C Communication Interface for easy MCU integration

• Automatic Leap Year Compensation

• Low Power Consumption, ideal for long-term use

• Retains Time During Power Loss using a coin-cell battery

• Compact and Breadboard-Friendly Design

Technical Specifications

• Module Type: Real-Time Clock (RTC)

• RTC IC: DS1307 / DS3231 (depending on variant)

• Interface: I²C

• Operating Voltage: 3.3V – 5V

• Time Format: 12-hour / 24-hour selectable

• Calendar: Day, Date, Month, Year

• Backup Battery: CR2032 (not always included)

• Accuracy:

  • DS1307: Standard accuracy

  • DS3231: High accuracy with temperature compensation

Compatibility

• Arduino Uno, Nano, Mega

• ESP32, ESP8266 (NodeMCU, Wemos D1 Mini)

• Raspberry Pi

• STM32 and other I²C-enabled microcontrollers

Applications

• Digital clocks and calendars

• Data logging systems

• IoT devices requiring timestamping

• Automation and scheduling systems

• Alarm and reminder systems

• Embedded and educational electronics projects