Ranking seven real programmable-matter technologies (DNA nanotech, modular robots, acoustic assembly, and more) against the 'utility fog' dream — and the L² scaling law that explains why none has closed the gap. Article, figures, scripts, and scored research.

An open-source acoustic levitation system capable of suspending small objects (like styrofoam beads) in mid-air using sound waves. This project utilizes 16mm ultrasonic transducers, a DRV8833 motor driver, an MT3608 boost converter, and an Arduino R3 microcontroller, housed inside a custom 3D-printed enclosure.

Numerical simulation of acoustic levitation thanks to the matrix method

Open Source echo sounder / depth sounder / SONAR for bathymetry and research. Arduino based and compatible.