A group of student group at University of Oslo called Applied Procrastination created this amazing display using 252 electro magnets… and gravity.
Teensy 3.6 and optimized code allowed fast enough control to hold the fluid stable.
Detailed are published on this Hackster page, and also this Hackday.io writeup. The complete source code is published on github.
Their impressive software work is built on top of hardware featuring pretty amazing craftsmanship. A grid 252 electro-magnets provide the force to move and suspend the display’s black fluid.
Electromagnets don’t just run themselves. The team had to create a dozen custom driver circuit boards to control all those individual magnetic fields.
Really impressive work from this team!