Arduino Compatible Precision Real Time Clock Module (DS1307)

This is what is known as a Real Time Clock (RTC) module and can be used with any Arduino so that it can tell time. The Arduino does not have a RTC on board and therefore can not tell time for an extended period of time with any accuracy. When the Arduino does tell  time it uses an internal counter to calculate an amount of elapsed time, this is inaccurate, limited (the clock can only count so high), cannot be related to the real time (i.e. the time on your watch), and is reset every time the Arduino is reset. The RTC allows you to create projects that are time dependent such as automating your coffee maker to make coffee at a set time of the day. It can also be used to create a clock in any of your Arduino projects such as an Arduino with an LCD display showing the values of various sensors.

Information on how to implement this RTC can be found here on the Arduino.cc website.

This RTC requires a CR2032 coin cell battery to operate, we sell these here

Key Features:

Utilizes a DS1307 real-time clock chip (IIC interface rate 100KHz)
Onboard AT24C32 IIC interface EEPROM memory
Use 32.768KHz crystalwith fixed groundind for reliable opperation
CR2032 plated battery holder for easy replacement of RTC batteries, this ensures your RTC will be opperational for a long time!
The power supply terminal is protected by a anti-reverse diode and reverse power burn circuit
Leads SQW / OUT interface, allow you to set the output frequency for the square wave
IIC devices can be cascaded through the soldered on pins
Includes a 24C32 32K I2C EEPROM which is also accessible via I2C
Reserve DS18B20 temperature sensor interface with a position for a DS18B20 Temperature Sensor to be soldered in on the PCB

Dimensions: Depth 20mm, Height 34mm, Width 15mm, Weight 2.6g