Description

RTC DS3231 I2C High Precision Real Time Clock Module

The RTC DS3231 I2C High Precision Real Time Clock Module is a highly accurate and reliable timekeeping device designed for Arduino, Raspberry Pi, ESP32, and other microcontroller platforms. Unlike the DS1307, which can drift over time, the DS3231 uses an integrated temperature-compensated crystal oscillator (TCXO) that maintains superior accuracy, even in varying environmental conditions.

This module provides timekeeping functions including seconds, minutes, hours, day, date, month, and year, with built-in leap-year compensation valid up to 2100. Its I2C communication protocol makes it simple to connect with development boards, while its onboard battery backup (CR2032 or equivalent) ensures that the clock keeps running even during power outages.

The DS3231 RTC module is widely used in data loggers, IoT systems, alarms, automation projects, and time-sensitive embedded applications that demand consistent and precise real-time tracking.

Key Features of DS3231 RTC Module

• High Precision RTC: Built-in temperature-compensated crystal oscillator (TCXO) for superior accuracy.

• Complete Timekeeping: Tracks seconds, minutes, hours, day, date, month, and year.

• I2C Communication: Easy integration with Arduino, Raspberry Pi, ESP8266, ESP32, and other microcontrollers.

• Leap-Year Compensation: Automatically accounts for leap years up to 2100.

• Backup Battery Support: Keeps accurate time during power loss using a CR2032 battery.

• Wide Voltage Compatibility: Operates at both 3.3V and 5V, suitable for most development boards.

• Non-Volatile Memory (EEPROM): Includes onboard 24C32 EEPROM with 32Kbit storage for data logging.

• Alarm Functions: Supports programmable alarms and square-wave output.

• Compact & Durable: Small PCB design with clear pin labels for ease of use.

Technical Specifications

• RTC IC: DS3231 (temperature-compensated)

• Interface: I2C (SDA, SCL)

• EEPROM: 24C32, 32Kbit storage

• Operating Voltage: 3.3V – 5V DC

• Accuracy: ±2ppm (±1 minute per year at 0°C to +40°C)

• Backup Battery: CR2032 or equivalent coin cell

• Temperature Sensor: Built-in with ±3°C accuracy

• Operating Temperature Range: -40°C to +85°C

• Communication Address: Default 0x68 (I2C)

• Dimensions: Compact and lightweight PCB module

Why Choose the DS3231 RTC Module?

1. Superior Accuracy – Far more precise than DS1307 thanks to its TCXO crystal.

2. Long-Term Reliability – Maintains accurate timekeeping with minimal drift.

3. Battery Backup – Keeps time running even without external power.

4. Built-in EEPROM – Store additional project data along with time information.

5. Versatile Applications – Suitable for both hobbyist projects and professional embedded systems.

6. Easy Integration – Works seamlessly with Arduino IDE libraries (RTClib, DS3231.h) and Raspberry Pi Python libraries.

Applications of DS3231 RTC Module

• Data Logging: Time-stamp sensor readings, environmental data, or event triggers.

• Clocks and Alarms: Build highly accurate digital clocks with alarm functions.

• IoT Projects: Maintain reliable timekeeping for connected smart devices.

• Automation Systems: Schedule appliances, lights, or relays based on real-time.

• Robotics: Enable time-based tasks in robotic systems.

• Embedded Systems: Integrate into industrial control systems requiring precise timing.

• Weather Stations: Log environmental data with real-time accuracy.

How to Use the DS3231 RTC Module

1. Wiring: Connect VCC to 3.3V or 5V, GND to ground, SDA to data pin, and SCL to clock pin on your Arduino or Raspberry Pi.

2. Insert Battery: Place a CR2032 coin cell in the holder to maintain time during power loss.

3. Install Libraries: For Arduino, install the RTClib library or other compatible RTC libraries.

4. Set the Time: Upload an example sketch to initialize the module with the current time and date.

5. Read Data: Retrieve real-time values such as hours, minutes, seconds, and date via I2C commands.

6. Integrate into Projects: Use the RTC for logging, scheduling, or triggering events.

With these simple steps, you can seamlessly add precise timekeeping functionality to your projects.

Package Includes

• 1 × DS3231 RTC I2C High Precision Real Time Clock Module

Conclusion

The RTC DS3231 I2C High Precision Real Time Clock Module is the ultimate choice for projects that demand accurate, reliable, and long-term timekeeping. With its temperature-compensated crystal oscillator, battery backup, EEPROM storage, and I2C compatibility, this module outperforms standard RTC modules like the DS1307.

Perfect for Arduino, Raspberry Pi, ESP8266, ESP32, and other microcontrollers, it is widely used in IoT systems, automation, robotics, data logging, and embedded electronics.

If you want your project to always run on time, the DS3231 RTC module is the most dependable option.

Data Sheet