DS3231 Real-Time Clock Module (RTC) – Accurate I2C RTC with Battery Backup

The DS3231 is a precision real-time clock module designed for microcontrollers like Arduino and Raspberry Pi. It keeps accurate time even when the main device is powered off, thanks to a built-in temperature-compensated crystal oscillator (TCXO) and a coin cell battery backup. Ideal for data logging, timers, and any project requiring reliable timekeeping.

Key Specifications

What You Can Build With This

• Digital clock display on an LCD or OLED screen
• Data logger with timestamp for sensor readings
• Automated timer for home appliances or irrigation systems
• Scheduling events in IoT projects or alarms

Compatibility

Works with any microcontroller that supports I2C, including Arduino Uno, Mega, Nano, Raspberry Pi, ESP32, and STM32. Operates at both 3.3V and 5V logic levels, making it easy to interface with a wide range of boards.

Wiring Notes

Connect SDA to your board's SDA pin (A4 on Arduino Uno), SCL to SCL (A5), VCC to 5V (or 3.3V) and GND to GND. The module includes pull-up resistors, so no external ones are needed. Insert a CR2032 battery in the holder for backup timekeeping when main power is off.

Why Buy from Compoden

Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.