Holdding DS3231 AT24C32 IIC Module Precision Real Time Clock Memory Module Arduino/Precise Time Clock Module with a Temperature-compensated Crystal Oscillator

Specification:

Size: 38 x 22 x 14mm
Weight: 8g
Temperature accuracy: 3 C
Maximum transmission speed: 400KHz (working voltage of 5V)
Feature:

Low-cost, accurate I2C real-time clock (RTC) module with a temperature-compensated crystal oscillator (TCXO) improving long-term accuracy
Precise temperature sensor, through the I2C interface for access Rechargeable battery LIR2032, maintaining accurate timekeeping without main power
Automatically adjusted including corrections for leap year
Calendar alarm clock with two programmable square-wave output
Generating seconds, minutes, hours, day, month and year timing till 2100
Cascaded with other IIC device, 24C32 addresses can be shorted A0/A1/A2 modify default address is 0x57
Rechargeable battery LIR2032, preventing the system from power failure
Wiring instructions (with Arduino uno r3 for example):

SCL→A5
SDA→A4
VCC→5V
GND→GND
Package included:

1x DS3231 AT24C32 IIC module
Most Helpful Customer Reviews

Clock Worked Perfect using DS3231_TEST library and notes from: http://misclab.umeoce.maine.edu/boss/Arduino/bensguides/DS3231_Arduino_Clock_Instructions.pdf

Basically my problem was: I set the time and date, disconnect the power, the time and date was not kept in memory, it default to the time and date I ran the sketch. The solution was found here in this tutorial: " http://tronixlabs.com/news/tutorial-using-ds1307-and-ds3231-realtime-clock-modules-with-arduino/ "