USB Hourglass for geeks

Forget about the way a traditional sand timer works in an hourglass - that USB Hourglass merges your everyday sand timer with a rotating mechanism and an optical beam that goes through the center of the timer in order to observe the falling sand. A detector on the other side will analyze the amount of light that reaches it, helping determine when is the exact moment to rotate the hourglass. All

juice is made available by the USB cable, so produce certain it remains plugged in somewhere at all times.

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