LED Bubbles From The 1970s Tell The Time | Hackaday
OSH Park on X: "Retro|Watch by @rafaelriber based around the HP QDSP-6064 Bubble display, used in 70s HP calculators like the HP-35: https://t.co/u6XDQmTlXF https://t.co/CRUx1mslgo" / X
Bubble Display 7 Segment 4 digit HP | ChiOSZ robots