Watches

How can I build a digital circuit with a row of LED lights that light in sequence?

I am planning to build a clock with a row of 60 green LEDs and another row of 12 blue LEDs. One of the green ones will light to show the minute and one of the blue ones will light to show the hour. On the final project they will be placed in a circle, but on a breadboard I will have to place them in rows. How can I build this without having a massive number of logic gates?

You need at least as many logic gates as LEDs.

The logic for the green LEDs can be as simple as a logical AND of the previous LED latched ouptut and a timer that counts off a minute. The first green LED is just a latched output of the minute timer. The green latches get reset a minute after the last green LED is lit. The first Blue Led is latched at the same time. Etc, etc, etc.

LED display – digital spectrum analyser

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