In the 1930s classic movie “The Wizard of Oz,” The Wicked Witch of the West uses a sand-filled hourglass to gleefully remind our hero Dorothy that she only has so much time to live while the sand is ...

So you need your project to pause for a preset number of minutes but you can’t do it programatically? Why not connect a micro-controller to an hourglass egg timer to sense when the sand stops moving ...

This project combines a sand timer with a rotating mechanism and an optical beam through the center of the timer to observe the falling sand as they create a USB Hourglass. This project combines a ...