Real Time Clock Module (DS1307) DS1307 RTC tutorial. Sparkfun/BigTime. BigTime Watch Kit. Description: The BigTime watch kit is a geekishly stylish digital watch with a NATO style watch-band and a slick acrylic enclosure.
If it seems familiar, that's because it's essentially our open-source branch from the SpikenzieLabs' Solder:Time kit. The heart of the kit is the much venerated ATMega328 using a 32kHz clock-source to keep time. To check the time, just press the button on the side of the watch and it pops up on a 4-digit 7-segment LED display. Fakufaku/TokyoTime.