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 ...

[Fearless Night]’s slick dual hourglass doesn’t just simulate sand with LEDs, it also emulates the effects of gravity on those simulated particles and offers a few different mode options. The unit ...

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 ...