This is a mini ultrasonic levitation device that can suspend foam balls. The device consists of a single-chip microcomputer, a driver chip, and two ultrasonic transducers.
(https://savagecircuits.com/wp-content/uploads/2023/08/Levitation_00.jpg)
CLICK HERE TO GO TO THIS PROJECT ON THE SAVAGE///CIRCUITS WEBSITE (https://savagecircuits.com/diy-levitation-kit/)