video://www.youtube.com/watch?v=Alf3QPirSG4
I’d probably stick with a traditional hourglass or my nike watch but this LED project is cool.
The LEDs are arranged in a circular conical fashion, to mimic the glass parts of a traditional hourglass, giving a 3-Dimensional appearance to the electronic hourglass. The system is equipped with a Z-axis accelerometer that detects the orientation of the hourglass and lights up the LEDs in the upper half, simulating the sand at the beginning of a measurement cycle. Subsequently, the LEDs in the lower half blink and light up in a fashion to simulate falling sand.
via 
4 Responses to HACK Project – 3D LED Hourglass!
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that is awesome… but how accurate to time is it???
To the second 🙂
So what happens when it gets turned over? there is a circuit board in the way 🙂
… oh… ok… but the circutboard… doesnt need tio be turned… it can just have a switch that can be flicked…
thats sweet but clock does the job fine XD