don’t get me wrong, i have and use arduionos. but an arduino for an alarm clock isn’t much of a hack. go with bcd counters and some dip-switches. use 74266 to compare set time with current ...

Imagine a clock where the colors aren’t from LEDs but a physics phenomenon – polarization. That’s just what [Mosivers], a physicist and electronics enthusiast, has done with the Polarizer Clock.