For this proyect I used Picaxe microcontrollers.
This clock involves all the types of comunication between MCUs i know to use.
It includes: i2c, infrared, paralel, 1 wire serial, and 2 wire serial (data bit-clock).
Step 1: Where does the hour come from???
To begin I used the DS1307 RTC to provide the hour to all the other MCUs. It is pretty esy to use it if you know how to usw i2c communications.