[Luc] wanted to make a clock like no other. He knows that the territory is well-trod, especially in the area of minimalist design. Undeterred, [Luc] came up with a fresh design that uses the resistor color code to display the time. He’s calling it the Nerd’s Ultimate Watch.
It doesn’t get much more minimalist than four RGB LEDs. Each one illuminates in the color that represents the digit in the current time. For instance, I’m typing this sentence at 1:37PM. The clock uses 24-hour time, so let’s call it 13:37. Using resistor color code time, that’s 1, 3, 3, 7, or brown, orange, orange, violet.
In the interest of using the smallest possible microcontroller, [Luc]’s clock only displays the hour and minute. He was able to use a ‘Tiny85 to control the four RGB LEDs plus two buttons for setting the time. Three AAA batteries give him around eight hours of power. [Luc] would like to use a LiPo so it can be scaled down a bit. The code and the STL files for the case are available at his site.