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4 LEDs Binary Clock,it show the time in binary mode,with blinking the leds first show the hours then minutes,to understand how it works you must know to read binary here is link to learn: http://www.wikihow.com/Read-a-Binary-Clock
cool! I'm gonna build one into a watch using an attiny13, but i'll only put 1 button, that will put time on 12h00 when pressed. i was trying to figure how to tell time with only 6 I/O. had a programm running on my arduino that displayed hours, blinked all leds, displayed minutes, but with 6 I/O I missed a led to display all minutes.
with only 6 I/O. had a programm running on my arduino that displayed hours, blinked all leds, displayed minutes, but with 6 I/O I missed a led to display all minutes.