DS3231 RTC Timer Module for Arduino & Raspberry Pi | High-Precision Real Time Clock

The DS3231 RTC Timer Module for Arduino & Raspberry Pi | High-Precision Real Time Clock is a low-cost, extremely accurate I2C real-time clock with an integrated temperature-compensated crystal oscillator. It maintains accurate timekeeping even when the main power is off.

Key Features

• Highly accurate RTC with ±2ppm (±5 seconds/month) precision
• Integrated TCXO (temperature-compensated crystal oscillator)
• I2C interface for easy microcontroller connection
• CR2032 battery backup maintains time during power loss
• Two programmable alarms for scheduled events
• Built-in temperature sensor with ±3°C accuracy
• Aging trim register for fine calibration

Technical Specifications

Applications

• Data logging with accurate timestamps
• Alarm clocks and timer projects
• Event scheduling systems
• Power-off timekeeping for embedded devices
• Time-based automation
• Chronograph and stopwatch applications

Important Notes

• Install CR2032 battery for time retention during power loss
• Use RTClib by Adafruit for Arduino support
• First run requires setting the time via microcontroller
• Built-in temperature sensor can be read but is for TCXO compensation
• SQW pin outputs square wave or alarm signal – configure as needed