SparkFun Real Time Clock Module

This is the SparkFun Real Time Clock (RTC) Module, a small breakout that utilizes the DS1307 to track the current year, month, day, and time. The module comes fully assembled and includes a small CR1225 Lithium coin cell battery that will run the RTC for a minimum of 9 years (typical 17 years) without an external 5V power supply. The DS1307 RTC is accessed via the I2C protocol. We've written a test-bed to program the modules. This code should provide you with some insight into how to interface the module with any microcontroller using our example software's I2C and BCD routines.