Size: 38mm (length) * 22mm (W) * 14mm (height) Operating voltage :3.3 - 5 .5 V Clock chip: high-precision clock chip DS3231 Clock Accuracy :0-40 degree range, the accuracy 5ppm, the error was about 1 minute Calendar alarm clock with two Programmable square-wave output Real time clock generator seconds, minutes, hours, day, date, month and year timing and provide valid until the year 2100 leap year compensation Chip temperature sensor comes with an accuracy of 3 degree Memory chips: AT24C32 (storage capacity 32K) IIC bus interface, the maximum transmission speed of 400KHz (working voltage of 5V) Can be cascaded with other IIC device, 24C32 addresses can be shorted A0/A1/A2 modify default address is 0x57 With rechargeable battery CR2032, to ensure the system after power failure, the clock move any natural normal
Wiring instructions (with uno r3 for example): SCL A5 SDA A4 VCC 5V GND GND