Make: Live – Acoustic Levitator!
Let's make some magic! With just a few ultrasonic transducers, an Arduino Nano and a few other components, we'll create a device that will make some lightweight objects defy gravity before our very eyes. Get the parts for this project: https://www.digikey.com/short/jd1551
Build instructions: https://makezine.com/projects/micro-ultrasonic-levitator/