Word clock is an interesting and unique way of displaying time. Instead of showing digits it highlights current time using words. All you have to do is to read words down in order to tell time. Ishan karve designed a word clock using 16×8 LED panel covered with letter mask. He used couple of MAX7219 LED display drivers – each capable to control 64LEDs. And split display panel in to 4×4 modules for easier development and eassembly.
The other part includes control and time keeping. Atmega168 takes care of reading time values from DS1307 RTC and also sends time update signals to LED panel. Since MAX7219 are controlled using SPI interface it doesn’t take much of load. Clock project is still in development so keep an eye on updates.