Introduction

This is the DS1307 Real Time Clock developed by one of our designers; waiman.  The module comes fully assembled and pre-programmed with the current time (ok, so it's our current time - MST). The included Lithium coin cell battery (CR1225 41mAh) will run the module for a minimum of 9 years (17 years typical) without external 5V power. The DS1307 is accessed via the I2C protocol. 

Specification

• Two wire I2C interface
• Hour : Minutes : Seconds AM/PM
• Day Month, Date - Year
• Leap year compensation
• Accurate calendar up to year 2100
• Battery backup included
• 1Hz output pin
• 56 Bytes of Non-volatile memory available to user

Shipping list 

• Real Time Clock Module (DS1307) (1 unit)

Documentation

• Wiki 
• Updated Arduino Library (compatible with IDE V1.0 and lower)
• Sample code, library, and wiring diagram (RAR file)