Coffee Can Clock
This Coffee Can Clock is a nice piece of work, there is a good build log and tons of details here at the Wise time with Arduino blog. “The electronics is based on Wiseduino (Arduino clone with DS1307 real time clock on board), with a LED matrix shield sitting on top. The shield is built with 74HC595 shift registers that drive two bi-color (red, green, and orange by subtraction) 8×8