When everyone is trying to pack more features in to digital watches, othermachine did the opposite. They built really simple digital watch where only two LEDs are used to tell the time. Watch is controlled by Attiny microcontroller which runs Arduino program.
Two LEDs are capable to display two binary digits at once. So by flashing four times in series hours and minutes can be displayed. All is left it to combine digital digits in your brain. Another interesting aspect of this project is that watch PCB was milled with Othermill – desktop milling machine.