DS3231 AT24C32 IIC Module Precision RTC Module

The DS3231 AT24C32 IIC Module is a precision real-time clock (RTC) board that keeps accurate time and date for Arduino, ESP32 and Raspberry Pi projects. The DS3231 chip has a built-in temperature-compensated crystal oscillator, so it drifts far less than common RTCs such as the DS1307, and a coin cell keeps the clock running when the main power is off. The board also carries an AT24C32 EEPROM for storing settings or log data.

DS3231 AT24C32 IIC Module Specifications

• RTC chip: DS3231 with integrated temperature-compensated crystal oscillator (TCXO)
• Accuracy: ±2 ppm from 0 °C to +40 °C, about 1 minute per year
• Timekeeping: seconds, minutes, hours, day, date, month and year, with leap-year correction
• Extras: 2 programmable alarms, square-wave output and a built-in temperature sensor
• EEPROM: AT24C32, 32 Kbit (4 KB)
• Interface: I2C (IIC), DS3231 at address 0x68
• Supply voltage: 3.3–5 V
• Backup: holder for a 2032-size coin cell

DS3231 AT24C32 IIC Module Applications

• Clocks and timers with LCD or LED displays
• Data loggers that time-stamp sensor readings
• Scheduled tasks such as irrigation, pet feeders and lighting
• Keeping time on boards without internet access
• School and university embedded systems projects

What's in the Box

• 1 × DS3231 AT24C32 RTC module

Tip: Connect SDA and SCL to the I2C pins (A4 and A5 on an Arduino Uno, GPIO 21 and 22 on most ESP32 boards) and use a library such as RTClib. Many versions of this board include a charging circuit meant for a rechargeable LIR2032 cell, so check your board before fitting a non-rechargeable CR2032.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.