The kit itself is made using through-hole components, with an ATTiny85 as the core microcontroller to drive two TCT40-16T ultrasonic speakers, and a MAX232 drives the transducers

The whole device is powered through the USB connection, and the ultrasonic speakers output in the 40KHz range providing enough power to levitate small Styrofoam balls.

The project is, by design, an exercise in minimalism, providing a kit that can be easily assembled, and providing code that can be easily flashed onto the device, examined and modified. All the design files, including the bill of materials, KiCAD schematics, and source code are provided under an open source hardware license

https://olimex.wordpress.com/2022/10/12/ultrasound-levitation-soldering-kits-will-be-present-at-openfest-for-soldering-workshop/

https://github.com/OLIMEX/Ultra-Sound-Levitation

Do you want to build an integrated 256-channels ultrasonic array? It can be used for acoustic levitation, haptic feedback, directional audio and other cool ideas that you have in mind. We show example applications and how to assemble the array.

https://www.instructables.com/SonicSurface-Phased-array-for-Levitation-Mid-air-T/

Ultrasonic levitation — the practice of creating a standing wave between two ultrasonic sources and positioning lightweight objects such that they can float in the pressure minimums between them — has been a source of fascination to more than one experimenter. [Peter Lin] demonstrated this in the video below the break, by creating an ultrasonic levitation system using only the trusted chip of all true experimenters, the NE555. (Video, embedded below.)

https://www.youtube.com/watch?v=B4pIJwy_ySY

Using non-linear acoustics, I’m able to focus audible sound like a laser. I go over some basic principals of operation, how I designed the circuit, and how you can build your own. Circuit Diagram

https://en.wikipedia.org/wiki/Sound_from_ultrasound

Do you want to build an integrated 256-channels ultrasonic array? It can be used for acoustic levitation, haptic feedback, directional audio and other cool ideas that you have in mind. We show example applications and how to assemble the array.

* Research paper: https://www.mdpi.com/2076-3417/11/7/2981
* Instructables: https://www.instructables.com/SonicSurface-Phased-array-for-Levitation-Mid-air-T/
* Github: https://github.com/upnalab/SonicSurface

This Acoustic Levitation Wand Will Make You Feel Like a Wizard
https://www.hackster.io/news/this-acoustic-levitation-wand-will-make-you-feel-like-a-wizard-40364341e2e5

Nothing is cooler than Redditor We-Make-Projects’ Arduino-powered sonic tractor beam!

Levitation has long been the domain of stage magicians, charlatans, and fiction, but there are technological means of achieving the same result. Aside from aircraft that could be considered to be levitating on air and boats that do the same on water, the most common examples of levitation in real world are maglev (magnetic levitation) trains. But you’ll probably never be able to build your own maglev train in your backyard. You can, however, experiment with acoustic levitation. We’ve seen a handful of notable acoustic levitators here on Hackster, but nothing is cooler than Redditor We-Make-Projects’ acoustic levitation wand that makes them a modern wizard.

https://www.reddit.com/r/arduino/comments/liyjcm/made_a_acoustic_levitator_tractor_beam_the/