4-LED Octal Clock Demands Colorful Math
We’ve all seen LED clocks where RGB LEDs are used to display
time. It seems like the simpler the interface, the more likely you’d
need to do math to figure out the time. This Octal Clock by
[Alex Kurrasch] proves the point by using only four LEDs: the top two
show hours and minutes, and the bottom two LEDs are multipliers.
Using octal numbering,
[Alex] translates the data using a Venn diagram of color mixing. The
mapping uses 1 as red, 2 as green, followed by yellow, blue, magenta,
and cyan. It ends with 7 as white (all on) and 0 as black (all off).
As the time changes, a fading algorithm changes the display to match.
He offers the time of 7:38pm as an example in the grid shown here.
Base-8 math is provided; don’t worry, you’ll get really good at this if
you make your own wristwatch version… people will learn to never ask you about the time.
The clock uses a ATMega64 running assembly language firmware with a
DS1306E+ RTC chip keeping track of time. The enclosure is cool too;
[Alex] milled the case out of mahogany and the front and back plates are
anodized aluminum. The unique looking diffusers on the LEDs are
actually paraffin, a trick that [Elliot Williams] mentioned in his recent article on diffuser materials.
Posted in clock hacksTagged atmega64, base-8, LED clock, octal
time. It seems like the simpler the interface, the more likely you’d
need to do math to figure out the time. This Octal Clock by
[Alex Kurrasch] proves the point by using only four LEDs: the top two
show hours and minutes, and the bottom two LEDs are multipliers.
Using octal numbering,[Alex] translates the data using a Venn diagram of color mixing. The
mapping uses 1 as red, 2 as green, followed by yellow, blue, magenta,
and cyan. It ends with 7 as white (all on) and 0 as black (all off).
As the time changes, a fading algorithm changes the display to match.
He offers the time of 7:38pm as an example in the grid shown here.
Base-8 math is provided; don’t worry, you’ll get really good at this if
you make your own wristwatch version… people will learn to never ask you about the time.
The clock uses a ATMega64 running assembly language firmware with a
DS1306E+ RTC chip keeping track of time. The enclosure is cool too;
[Alex] milled the case out of mahogany and the front and back plates are
anodized aluminum. The unique looking diffusers on the LEDs are
actually paraffin, a trick that [Elliot Williams] mentioned in his recent article on diffuser materials.
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