This Arduino Nano R4-controlled hourglass simulates sand with LEDs
Arduino Team — October 1st, 2025 Outside of playing board games, hourglasses are almost entirely pointless these days. And yet, they’re still incredibly satisfying. Watching the sand fall in a steady and consistent stream is downright mesmerizing. Sadly, you probably can’t make your own hourglass unless you happen to be very skilled at glassblowing. But you can create this LED hourglass with sand physics instead. Four years ago, Edison Science Corner posted a...
