SPECIFICATIONS

* Working voltage: 3.3-5.5V
* Clock chip: high precision clock chip DS3231
* Clock accuracy: within the range of 0-40°C, the accuracy is 2ppm, and the annual error is about 1 minute
* With 2 calendar alarm clocks
** Programmable square wave output
* The real-time clock produces seconds, minutes, hours, days, days, months, and years, and provides leap year compensation valid until 2100
* The chip has a built-in temperature sensor with an accuracy of 3°C
* Memory chip :AT24C32(storage capacity 32K)
*11C bus interface, transmission speed 400KHz (operating voltage is 5V)
* Other IIC devices can be cascaded. The 24C32 address can be modified by short circuit A0/A1/A2. The default address is 0x57
* With battery CR2032, ensure that the clock is still running normally after the system is powered off
* Packing method: Single anti-static packing

Wiring instructions (using Arduino uno r3 as an example) :
SCL→A5
SDA-+ A4
VCC→5V
GND→GND