Block Clock - 4 x 1.8" 9-segment digits
thingiverse
A digital clock project is underway, featuring a main digit plate with 38 LED holes (9 per digit plus 2 for the colon). The LEDs are multiplexed for decent brightness, using 330 ohm resistors; however, 220 Ohms are recommended for white LEDs. Check out the LED test video at http://www.youtube.com/watch?v=aNAoDoVr2t0. The clock design is in SketchUp and remains a work in progress. A Fritzing Diagram is attached, detailing the wiring for the LEDs and Arduino. Note that it's incomplete, as it doesn't include the RTC module, input devices, power, or a buzzer/sound module. Stay tuned for updates!
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