DS3231 RTC Module Features

• Working voltage: 3.3 - 5.5 V
• Clock chip: DS3231 with high precision
• Clock accuracy: in the range of 0-40 ℃, accuracy: 2ppm, error about 1 minute
• Programmable square-wave output
• Creates a real-time timing of seconds, minutes, hours, days, dates, months and years.
• 2100 leap year compensation
• The chip temperature sensor comes with an accuracy of ±3℃.
• Memory chip: AT24C32 (32K storage capacity)
• IIC bus interface, maximum transmission rate of 400KHz (5V operating voltage)
• Thanks to the LIR2032 Rechargeable battery, it allows the system to continue its normal operation even after a power outage.

Wiring instructions (For example: with UNO R3):

SCL → A5

SDA → A4

VCC → 5V

GND → GND

Note: The battery is not included in the package.