“A cool Newton’s cradle made from ping pong balls containing WS2812B LEDs.
This project emulates a Newton’s cradle using light to demonstrate the conservation of momentum and energy. The original project was created by TecnoProfesor and can be found at RGB LED Newton’s Cradle. My variant uses WS2812B NeoPixel LEDs and an ATtiny1614 microprocessor. It is enclosed in a 3D-printed case.”