Cool Binary Clock Uses Old-School LEDs and a Fancy Graphic PCB - Ah, the 5mm LED. Once a popular choice, they’ve been supplanted in modernity by sm... - https://hackaday.com/2021/08/06/cool-binary-clock-uses-old-school-leds-and-a-fancy-graphic-pcb/ #binaryclock #clockhacks #clock #cmos