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Making a Digital Hourglass

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Written by Paul Strauss | March 31, 2022

An old-fashioned hourglass is a handy way to count down fixed increments of time. While a traditional hourglass is filled with sand, Engineercly’s 3D-printed version is completely digital, counting time on a pair of LED matrices controlled by an Arduino Nano. He used an accelerometer to track its angle and to direct the LED dots.

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