Click on the following link for product video demo presentation. https://youtu.be/l5eTkBy5YeA

DS3231 is a low-cost, extremely accurate I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCX O) and crystal.

RTC maintains seconds, minutes, hours, day, date, month, and year information.

Provides two configurable alarm clock and a calendar can be set to a square wave output. Address and data are transferred serially through an I2C bidirectional bus.

The device incorporates a battery input, disconnect the main power supply and maintains accurate timekeeping. Integrated oscillator improve long-term accuracy of the device and reduces the number of components of the production line. The DS3231 is available in commercial and industrial temperature ranges, using a 16-pin 300mil SO package.
RTC maintains seconds, minutes, hours, day, date, month, and year information. Less than 31 days of the month, the end date will be automatically adjusted, including corrections for leap year. The clock operates in either the 24 hours or band / AM / PM indication of the 12-hour format. Provides two configurable alarm clock and a calendar can be set to a square wave output. Address and data are transferred serially through an I2C bidirectional bus.

A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures, provide a reset output, and if necessary, automatically switch to the backup power supply. In addition, / RST pin is monitored as generating µP reset manually.

Module parameters:
1. Size: 38mm (length) * 22mm (width) * 14mm (height)
2. Weight: 8g
3. Operating voltage: 3.3--5.5V
4. Clock chip: high-precision clock chip DS3231
5. Clock accuracy : 0-40 ° C, accuracy 2ppm, annual error of about 1 minute
6. With 2 calendar alarms
7. Programmable square wave output
8. Real-time clock produces seconds, minutes, hours, weeks, dates, months and years, And provide the leap year compensation valid until 2100.
9. The chip has its own internal temperature sensor with an accuracy of ±3 °C.
10. Memory chip: AT24C32 (storage capacity 32K)
11. IIC bus interface, the maximum transmission speed is 400KHz (when the working voltage is 5V) )
12. the IIC may be cascaded to other devices, the address can 24C32 / A1 / A2 modified by shorting A0, 0x57 default address is
13. with battery CR2032, to ensure that the system power off, then any normal walking clock

wiring instructions (take Arduino uno r3 as an example):
SCL  A5
SDA  A4
VCC  5V
GND  GND