Tully wrote to us about his latest project, the Arduino doomsday clock shield. The board features six 7-segment displays counting down up to the end of the Mayan calendar.
I want to show off one of my recent creations, the Doomsday Clock Arduino Shield. You can use it to countdown the final hours until the end of the Mayan Calendar, or learn how by Charlieplexing all 64 LEDs are controlled by only 9 digital pins on the Arduino.
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