 # Digital clock Wikipedia

As of 2008, the most common binary clocks sold are designed by Anelace Inc., and use six columns of LEDs to represent zeros and ones. Each column represents a single decimal digit, a format known as binary-coded decimal (BCD). The bottom row in each column represents 1 (or 20), with each row above representing higher powers of two, up to 23 (or 8).

To read each individual digit in the time, the user adds the values that each illuminated LED represents, then reads these from left to right. The first two columns represent the hour, the next two represent the minute and the last two represent the second. Since zero digits are not illuminated, the positions of each digit must be memorized if the clock is to be usable in the dark.

### Binary-coded sexagesimal clocks

Time Technology's Samui Moon binary-coded sexagesimal wristwatch. This clock reads 3:25.

Binary clocks that display time in binary-coded sexagesimal also exist. Instead of representing each digit of traditional sexagesimal time with one binary number, each component of traditional sexagesimal time is represented with one binary number, that is, using up to 6 bits instead of only 4.

For 24-hour binary-coded sexagesimal clocks, there are 11 or 17 LED lights to show us the time. There are 5 LEDs to show the hours, there are 6 LEDs to show the minutes, and there are 6 LEDs to show the seconds. 6 LEDs to show the seconds are not needed in 24-hour binary-coded sexagesimal clocks with 11 LED lights.

1 1 0 0 1 1 0 0 0 1 0 0 1 1
Hours Minutes Seconds
32
16
10 37 49
A binary clock circuit displaying 13:49:37

The above display uses three binary number columns, one for each of the units (hours, minutes and seconds) of the conventional time system.

Source: en.wikipedia.org

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