## LED Binary Clock - Red

Fandom Planet

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It's fun to watch the constantly changing patterns in this light display...but the best thing about this compact unit is that it's actually a clock! It uses binary code - the language of computers - to show the time. After a few minutes' practice, you'll be able to read the time by adding the values of the lit LEDs in each. This clock is based on the binary number system, the language of computers. HOW NUMBERS ARE REPRESENTED: In the decimal numbering system, six digits are required to indicate the time. For example: At 48 minutes and 36 seconds past 10 o'clock, we write 10:48:36. This clock has 6 columns of lights, corresponding - left to right - to "tens of hours," hours, "tens of minutes," minutes, and "tens of seconds," seconds, the six digits required to display the time. Each column represents a decimal number value from 0 to 9. [The term for this use of binary numbers is "Binary-Coded Decimal," or "BCD."] The value of the decimal number represented in each column is determined by which lights in that column are ON i.e. which ones are lit: • The bottom light, if lit, is worth "1." • The one above it, if lit, is worth " 2." • The third one from the bottom, if lit, is worth "4." • The fourth one from the bottom, if lit, is worth "8". => You add the values of the ON light positions to get the final decimal value. All 10 possible values are shown in the diagram below. * * Hint: Remember the sequence: 1, 2, 4, 8 - bottom to top * * Note: The third (value = "4") and fourth (value="8") lights in a given column may not be there, depending on the maximum decimal value that column may have. For instance, after "59" seconds, the seconds counter cycles back to "00." Thus, the "tens of seconds" value never goes above "5." Since the maximum value -"5" - can be displayed as the sum of 4 and 1, only the "1" light and the "4" light are needed to display "5." No "8" light is needed for any "tens of seconds" number value.

Dimensions: 3.5" x 3.5" x 2"

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You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).