For an average person it looks just like a bunch of lights, but you will be able to tell the time by just a quick glance at this clock. It might take you a couple of days to get up to speed on the esoteric art of fast binary counting, but you'll be able to tell the time right away, just a bit slower in the beginning.
Here's a instructable of counting in binary Binary counting.
Step 1: What you need
- One Atmel Tiny2313 microcontroller
- One 0.1 uF capacitor
- Eleven resistors - 120 ohm
- Eleven high brightness leds. I used 6 white and 5 yellow
- One 10 MHz crystal
- Two 20 pF capacitors
- One small pushbutton
- Eleven glass marbles
- A nice piece of wood to mount it all on