https://www.roboholicmaniacs.com/product-page/ball-on-plate
This is a demo of the Ball on Plate product provided by Roboholic Maniacs.
2 PID loops, a touch screen, 2 servos, Mega 2560 microchip controller, and a power supply are mounted professionally on a plexiglass.
Good product to learn controls and demo your coding capabilities.
Buy yours from(USA and Canada)